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Multifunctional Integrated Organic-Inorganic-Metal Hybrid Aerogel for Excellent Thermal Insulation and Electromagnetic Shielding Performance 被引量:1
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作者 Zhaoqi Niu Fengjin Qu +8 位作者 Fang Chen Xiaoyan Ma Beixi Chen Luyao Wang Miao Xu Shumeng Wang Liang Jin Chengshuang Zhang Xiao Hou 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第10期163-175,共13页
Vehicles operating in space need to withstand extreme thermal and electromagnetic environments in light of the burgeoning of space science and technology.It is imperatively desired to high insulation materials with li... Vehicles operating in space need to withstand extreme thermal and electromagnetic environments in light of the burgeoning of space science and technology.It is imperatively desired to high insulation materials with lightweight and extensive mechanical properties.Herein,a boron-silica-tantalum ternary hybrid phenolic aerogel(BSiTa-PA)with exceptional thermal stability,extensive mechanical strength,low thermal conductivity(49.6 mW m^(-1)K^(-1)),and heightened ablative resistance is prepared by an expeditious method.After extremely thermal erosion,the obtained carbon aerogel demonstrates noteworthy electromagnetic interference(EMI)shielding performance with an efficiency of 31.6 dB,accompanied by notable loading property with specific modulus of 272.8 kN·m kg^(-1).This novel design concept has laid the foundation for the development of insulation materials in more complex extreme environments. 展开更多
关键词 Multi-hybrid aerogel Metal-phenolic coordination thermal insulation EMI shielding Convertibility and multifunctionality
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Leakage Proof,Flame-Retardant,and Electromagnetic Shield Wood Morphology Genetic Composite Phase Change Materials for Solar Thermal Energy Harvesting 被引量:1
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作者 Yuhui Chen Yang Meng +7 位作者 Jiangyu Zhang Yuhui Xie Hua Guo Mukun He Xuetao Shi Yi Mei Xinxin Sheng Delong Xie 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第10期99-120,共22页
Phase change materials(PCMs)offer a promising solution to address the challenges posed by intermittency and fluctuations in solar thermal utilization.However,for organic solid-liquid PCMs,issues such as leakage,low th... Phase change materials(PCMs)offer a promising solution to address the challenges posed by intermittency and fluctuations in solar thermal utilization.However,for organic solid-liquid PCMs,issues such as leakage,low thermal conductivity,lack of efficient solar-thermal media,and flamma-bility have constrained their broad applications.Herein,we present an innova-tive class of versatile composite phase change materials(CPCMs)developed through a facile and environmentally friendly synthesis approach,leveraging the inherent anisotropy and unidirectional porosity of wood aerogel(nanowood)to support polyethylene glycol(PEG).The wood modification process involves the incorporation of phytic acid(PA)and MXene hybrid structure through an evaporation-induced assembly method,which could impart non-leaking PEG filling while concurrently facilitating thermal conduction,light absorption,and flame-retardant.Consequently,the as-prepared wood-based CPCMs showcase enhanced thermal conductivity(0.82 W m^(-1)K^(-1),about 4.6 times than PEG)as well as high latent heat of 135.5 kJ kg^(-1)(91.5%encapsula-tion)with thermal durability and stability throughout at least 200 heating and cooling cycles,featuring dramatic solar-thermal conversion efficiency up to 98.58%.In addition,with the synergistic effect of phytic acid and MXene,the flame-retardant performance of the CPCMs has been significantly enhanced,showing a self-extinguishing behavior.Moreover,the excellent electromagnetic shielding of 44.45 dB was endowed to the CPCMs,relieving contemporary health hazards associated with electromagnetic waves.Overall,we capitalize on the exquisite wood cell structure with unidirectional transport inherent in the development of multifunctional CPCMs,showcasing the operational principle through a proof-of-concept prototype system. 展开更多
关键词 Wood PCMs MXene Solar thermal storage and conversion FLAME-RETARDANT Electromagnetic shielding
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Self‑Assembly of Binderless MXene Aerogel for Multiple‑Scenario and Responsive Phase Change Composites with Ultrahigh Thermal Energy Storage Density and Exceptional Electromagnetic Interference Shielding 被引量:1
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作者 Chuanbiao Zhu Yurong Hao +8 位作者 Hao Wu Mengni Chen Bingqing Quan Shuang Liu Xinpeng Hu Shilong Liu Qinghong Ji Xiang Lu Jinping Qu 《Nano-Micro Letters》 SCIE EI CSCD 2024年第3期367-382,共16页
The severe dependence of traditional phase change materials(PCMs)on the temperature-response and lattice deficiencies in versatility cannot satisfy demand for using such materials in complex application scenarios.Here... The severe dependence of traditional phase change materials(PCMs)on the temperature-response and lattice deficiencies in versatility cannot satisfy demand for using such materials in complex application scenarios.Here,we introduced metal ions to induce the self-assembly of MXene nanosheets and achieve their ordered arrangement by combining suction filtration and rapid freezing.Subsequently,a series of MXene/K^(+)/paraffin wax(PW)phase change composites(PCCs)were obtained via vacuum impregnation in molten PW.The prepared MXene-based PCCs showed versatile applications from macroscale technologies,successfully transforming solar,electric,and magnetic energy into thermal energy stored as latent heat in the PCCs.Moreover,due to the absence of binder in the MXene-based aerogel,MK3@PW exhibits a prime solar-thermal conversion efficiency(98.4%).Notably,MK3@PW can further convert the collected heat energy into electric energy through thermoelectric equipment and realize favorable solar-thermal-electric conversion(producing 206 mV of voltage with light radiation intensity of 200 mw cm^(−2)).An excellent Joule heat performance(reaching 105℃with an input voltage of 2.5 V)and responsive magnetic-thermal conversion behavior(a charging time of 11.8 s can achieve a thermal insulation effect of 285 s)for contactless thermotherapy were also demonstrated by the MK3@PW.Specifically,as a result of the ordered arrangement of MXene nanosheet self-assembly induced by potassium ions,MK3@PW PCC exhibits a higher electromagnetic shielding efficiency value(57.7 dB)than pure MXene aerogel/PW PCC(29.8 dB)with the same MXene mass.This work presents an opportunity for the multi-scene response and practical application of PCMs that satisfy demand of next-generation multifunctional PCCs. 展开更多
关键词 Self-assembly Multiple-scenario Phase change composites thermal energy storage Electromagnetic interference shielding
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Thermally Conductive and UV-EMI Shielding Electronic Textiles for Unrestricted and Multifaceted Health Monitoring 被引量:1
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作者 Yidong Peng Jiancheng Dong +8 位作者 Jiayan Long Yuxi Zhang Xinwei Tang Xi Lin Haoran Liu Tuoqi Liu Wei Fan Tianxi Liu Yunpeng Huang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第10期149-162,共14页
Skin-attachable electronics have garnered considerable research attention in health monitoring and artificial intelligence domains,whereas susceptibility to elec-tromagnetic interference(EMI),heat accumulation issues,... Skin-attachable electronics have garnered considerable research attention in health monitoring and artificial intelligence domains,whereas susceptibility to elec-tromagnetic interference(EMI),heat accumulation issues,and ultraviolet(UV)-induced aging problems pose significant constraints on their potential applications.Here,an ultra-elas-tic,highly breathable,and thermal-comfortable epidermal sensor with exceptional UV-EMI shielding performance and remarkable thermal conductivity is developed for high-fidelity monitoring of multiple human electrophysiological signals.Via filling the elastomeric microfibers with thermally conductive boron nitride nanoparticles and bridging the insulating fiber interfaces by plating Ag nanoparticles(NPs),an interwoven thermal con-ducting fiber network(0.72 W m^(-1) K^(-1))is constructed benefiting from the seamless thermal interfaces,facilitating unimpeded heat dissipation for comfort skin wearing.More excitingly,the elastomeric fiber substrates simultaneously achieve outstanding UV protection(UPF=143.1)and EMI shielding(SET>65,X-band)capabilities owing to the high electrical conductivity and surface plasmon resonance of Ag NPs.Furthermore,an electronic textile prepared by printing liquid metal on the UV-EMI shielding and thermally conductive nonwoven textile is finally utilized as an advanced epidermal sensor,which succeeds in monitoring different electrophysiological signals under vigorous electromagnetic interference.This research paves the way for developing protective and environmentally adaptive epidermal electronics for next-generation health regulation. 展开更多
关键词 Skin electronics thermal regulating textiles Electromagnetic interference shielding Ultraviolet proof Health monitoring
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MXene@c-MWCNT Adhesive Silica Nanofiber Membranes Enhancing Electromagnetic Interference Shielding and Thermal Insulation Performance in Extreme Environments 被引量:1
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作者 Ziyuan Han Yutao Niu +11 位作者 Xuetao Shi Duo Pan Hu Liu Hua Qiu Weihua Chen Ben Bin Xu Zeinhom MEl-Bahy Hua Hou Eman Ramadan Elsharkawy Mohammed AAmin Chuntai Liu Zhanhu Guo 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第10期82-98,共17页
A lightweight flexible thermally stable composite is fabricated by com-bining silica nanofiber membranes(SNM)with MXene@c-MWCNT hybrid film.The flexible SNM with outstanding thermal insulation are prepared from tetrae... A lightweight flexible thermally stable composite is fabricated by com-bining silica nanofiber membranes(SNM)with MXene@c-MWCNT hybrid film.The flexible SNM with outstanding thermal insulation are prepared from tetraethyl orthosilicate hydrolysis and condensation by electrospinning and high-temperature calcination;the MXene@c-MWCNT_(x:y)films are prepared by vacuum filtration tech-nology.In particular,the SNM and MXene@c-MWCNT_(6:4)as one unit layer(SMC_(1))are bonded together with 5 wt%polyvinyl alcohol(PVA)solution,which exhibits low thermal conductivity(0.066 W m^(-1)K^(-1))and good electromagnetic interference(EMI)shielding performance(average EMI SE_(T),37.8 dB).With the increase in func-tional unit layer,the overall thermal insulation performance of the whole composite film(SMC_(x))remains stable,and EMI shielding performance is greatly improved,especially for SMC_(3)with three unit layers,the average EMI SET is as high as 55.4 dB.In addition,the organic combination of rigid SNM and tough MXene@c-MWCNT_(6:4)makes SMC_(x)exhibit good mechanical tensile strength.Importantly,SMC_(x)exhibit stable EMI shielding and excellent thermal insulation even in extreme heat and cold environment.Therefore,this work provides a novel design idea and important reference value for EMI shielding and thermal insulation components used in extreme environmental protection equipment in the future. 展开更多
关键词 SiO_(2)nanofiber membranes MXene@c-MWCNT Composite film thermal insulation Electromagnetic interference shielding
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Multifunctional MXene/Carbon Nanotube Janus Film for Electromagnetic Shielding and Infrared Shielding/Detection in Harsh Environments
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作者 Tufail Hassan Aamir Iqbal +14 位作者 Byungkwon Yoo Jun Young Jo Nilufer Cakmakci Shabbir Madad Naqvi Hyerim Kim Sungmin Jung Noushad Hussain Ujala Zafar Soo Yeong Cho Seunghwan Jeong Jaewoo Kim Jung Min Oh Sangwoon Park Youngjin Jeong Chong Min Koo 《Nano-Micro Letters》 SCIE EI CAS CSCD 2024年第10期543-560,共18页
Multifunctional,flexible,and robust thin films capable of operating in demanding harsh temperature environments are crucial for various cutting-edge applications.This study presents a multifunctional Janus film integr... Multifunctional,flexible,and robust thin films capable of operating in demanding harsh temperature environments are crucial for various cutting-edge applications.This study presents a multifunctional Janus film integrating highly-crystalline Ti_(3)C_(2)T_(x) MXene and mechanically-robust carbon nanotube(CNT)film through strong hydrogen bonding.The hybrid film not only exhibits high electrical conductivity(4250 S cm^(-1)),but also demonstrates robust mechanical strength and durability in both extremely low and high temperature environments,showing exceptional resistance to thermal shock.This hybrid Janus film of 15μm thickness reveals remarkable multifunctionality,including efficient electromagnetic shielding effectiveness of 72 dB in X band frequency range,excellent infrared(IR)shielding capability with an average emissivity of 0.09(a minimal value of 0.02),superior thermal camouflage performance over a wide temperature range(−1 to 300℃)achieving a notable reduction in the radiated temperature by 243℃ against a background temperature of 300℃,and outstanding IR detection capability characterized by a 44%increase in resistance when exposed to 250 W IR radiation.This multifunctional MXene/CNT Janus film offers a feasible solution for electromagnetic shielding and IR shielding/detection under challenging conditions. 展开更多
关键词 MXene/carbon nanotube Janus film Electromagnetic interference shielding Infrared shielding thermal camouflage Infrared detection
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Preparation and electromagnetic shielding properties of PET/rGO/SWCNT composite fabric
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作者 ZHANG Xu LIU Xuejiao YAN Yehai 《合成纤维工业》 CAS 2024年第5期58-62,68,共6页
Graphene oxide(GO)with excellent dispersion ability can assist the dispersion of single-walled carbon nanotube(SWCNT)and promote the formation of uniform and stable GO/SWCNT coating liquid.The highly conductive polyet... Graphene oxide(GO)with excellent dispersion ability can assist the dispersion of single-walled carbon nanotube(SWCNT)and promote the formation of uniform and stable GO/SWCNT coating liquid.The highly conductive polyethylene terephthalate/reduced graphene oxide/SWCNT(PET/rGO/SWCNT)electromagnetic shielding composite fabric was successfully prepared by anchoring rGO/SWCNT on PET fabric via dip-coating piror to low-temperature thermal reduction.The results showed that the carboxyl groups and hydroxyl groups formed of hydrophilic-treated PET were conducive to the formation of hydrogen bonds with that of GO,which enhanced the interaction between PET fabric and GO/SWCNT coating;the loading of GO/SWCNT increased with the number of dip-coating,the unit area loading of rGO/SWCNT in the final composite fabric was 2.7 mg/cm^(2) after 10 dip-coating cycles and thermal reduction;the PET/rGO/SWCNT composite fabric had a continuous and dense conductive network,with a conductivity of up to 41.6 S/m and the average electromagnetic interference shielding effectiveness in X-band was 22 dB;the flexible PET/rGO/SWCNT composite fabric was not only easy to process,but also exhibited excellent conductivity and shielding efficiency,showing great potential in the application of electromagnetic shielding fabrics. 展开更多
关键词 electromagnetic interference shielding graphene oxide single-walled carbon nanotubes conductive fabric thermal reduction
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Printable Aligned Single-Walled Carbon Nanotube Film with Outstanding Thermal Conductivity and Electromagnetic Interference Shielding Performance 被引量:9
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作者 Zhihui Zeng Gang Wang +8 位作者 Brendan F.Wolan Na Wu Changxian Wang Shanyu Zhao Shengying Yue Bin Li Weidong He Jiurong Liu Joseph W.Lyding 《Nano-Micro Letters》 SCIE EI CAS CSCD 2022年第11期143-156,共14页
Ultrathin,lightweight,and flexible aligned single-walled carbon nanotube(SWCNT)films are fabricated by a facile,environmentally friendly,and scalable printing methodology.The aligned pattern and outstanding intrinsic ... Ultrathin,lightweight,and flexible aligned single-walled carbon nanotube(SWCNT)films are fabricated by a facile,environmentally friendly,and scalable printing methodology.The aligned pattern and outstanding intrinsic properties render“metal-like”thermal conductivity of the SWCNT films,as well as excellent mechanical strength,flexibility,and hydrophobicity.Further,the aligned cellular microstructure promotes the electromagnetic interference(EMI)shielding ability of the SWCNTs,leading to excellent shielding effectiveness(SE)of~39 to 90 dB despite a density of only~0.6 g cm^(−3) at thicknesses of merely 1.5-24μm,respectively.An ultrahigh thickness-specific SE of 25693 dB mm^(−1) and an unprecedented normalized specific SE of 428222 dB cm^(2)g^(−1) are accomplished by the freestanding SWCNT films,significantly surpassing previously reported shielding materials.In addition to an EMI SE greater than 54 dB in an ultra-broadband frequency range of around 400 GHz,the films demonstrate excellent EMI shielding stability and reliability when subjected to mechanical deformation,chemical(acid/alkali/organic solvent)corrosion,and high-/low-temperature environments.The novel printed SWCNT films offer significant potential for practical applications in the aerospace,defense,precision components,and smart wearable electronics industries. 展开更多
关键词 Aligned film Single-walled carbon nanotube LIGHTWEIGHT FLEXIBLE thermal conductivity Electromagnetic interference shielding
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B4C/NRL flexible films for thermal neutron shielding 被引量:2
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作者 Yi-Chuan Liao Dui-Gong Xu Peng-Cheng Zhang 《Nuclear Science and Techniques》 SCIE CAS CSCD 2018年第2期17-25,共9页
Boron carbide/natural rubber latex(B_4 C/NRL)flexible films were prepared via dip-molding with B_4 C content in the range of 5–55 wt% for thermal neutron(0.0253 e V) shielding. B_4 C was well dispersed in NRL accordi... Boron carbide/natural rubber latex(B_4 C/NRL)flexible films were prepared via dip-molding with B_4 C content in the range of 5–55 wt% for thermal neutron(0.0253 e V) shielding. B_4 C was well dispersed in NRL according to microscopic observation. Both the inside and outside surfaces of the film were smooth. For B_4 C/NRL flexible films, the minimum elongation at break was greater than 600%, the minimum tensile strength was greater than 12 MPa, and the hardness was in the range of 35–55 HA,which were suitable for preparing flexible wearable products. The attenuation efficiencies of the B_4 C/NRL flexible films for thermal neutrons were also calculated. The B_4 C/NRL flexible films exhibit good attenuation effect for thermal neutrons. 展开更多
关键词 B4C Natural rubber LATEX thermal NEUTRON shield Flexible film
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Mechanically strong and folding-endurance Ti_(3)C_(2)T_(x) MXene/PBO nanofiber films for efficient electromagnetic interference shielding and thermal management 被引量:16
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作者 Lei Wang Zhonglei Ma +3 位作者 Yali Zhang Hua Qiu Kunpeng Ruan Junwei Gu 《Carbon Energy》 SCIE CAS 2022年第2期200-210,共11页
Electromagnetic interference(EMI)shielding materials with excellent flexibility and mechanical properties and outstanding thermal conductivity have become a hot topic of research in functional composites.In this study... Electromagnetic interference(EMI)shielding materials with excellent flexibility and mechanical properties and outstanding thermal conductivity have become a hot topic of research in functional composites.In this study,the“sol-gel-film conversion technique”is used to assemble polyetherimidefunctionalized Ti_(3)C_(2)T_(x) nanosheets(f-Ti_(3)C_(2)T_(x))with poly(p-phenylene-2,6-benzobisoxazole)(PBO)nanofibers(PNFs),followed by dialysis and vacuum drying to prepare f-Ti_(3)C_(2)T_(x)/PNF films with lamellar structures.When the loading of f-Ti_(3)C_(2)T_(x) is 70 wt%,the f-Ti_(3)C_(2)T_(x)/PNF film presents optimal comprehensive properties,with an EMI shielding effectiveness(SE)of 35 dB and a specific SE/thickness((SSE,SE/density)/t)of 8211 dB cm^(2)/g,a tensile strength of 125.1 MPa,an in-plane thermal conductivity coefficient(λ)of 5.82 W/(m K),and electrical conductivity of 1943 S/m.After repeated folding for 10,000 cycles,the EMI SE and the tensile strength of f-Ti_(3)C_(2)T_(x)/PNFs films still remain 33.4 dB and 116.1 MPa,respectively.Additionally,the f-Ti_(3)C_(2)T_(x)/PNF film also shows excellent thermal stability,flame retardancy,and structural stability.This would provide a novel method for the design and fabrication of multifunctional composite films and considerably expand the applications of MXene-and PNF-based composites in the fields of EMI shielding and thermal management. 展开更多
关键词 electromagnetic interference shielding PBO nanofibers thermal management Ti_(3)C_(2)T_(x)MXene
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Design and Analysis of the Thermal Shield of EAST Tokamak 被引量:1
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作者 谢韩 廖子英 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第2期227-230,共4页
EAST (Experimental Advanced Superconducting Tokamak) is a tokamak with su- perconducting toroidal and poloidal magnets operated at 4.5 K. In order to reduce the thermal load applied on the surfaces of all cryogenica... EAST (Experimental Advanced Superconducting Tokamak) is a tokamak with su- perconducting toroidal and poloidal magnets operated at 4.5 K. In order to reduce the thermal load applied on the surfaces of all cryogenically cooled components and keep the heat load of the cryogenic system at a minimum, a continuous radiation shield system located between the magnet system and warm components is adopted. The main loads to which the thermal shield system is subjected are gravity, seismic, electromagnetic and thermal gradients. This study employed NASTRAN and ANSYS finite element codes to analyze the stress under a spectrum of loading conditions and combinations, providing a theoretical basis for an optimization design of the structure. 展开更多
关键词 TOKAMAK thermal shield LOAD finite element
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"Three-in-One" Multi-Scale Structural Design of Carbon Fiber-Based Composites for Personal Electromagnetic Protection and Thermal Management 被引量:8
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作者 Ming Zhou Shujuan Tan +3 位作者 Jingwen Wang Yue Wu Leilei Liang Guangbin Ji 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第10期317-333,共17页
Wearable devices with efficient thermal management and electromagnetic interference(EMI) shielding are highly desirable for improving human comfort and safety. Herein, a multifunctional wearable carbon fibers(CF) @ po... Wearable devices with efficient thermal management and electromagnetic interference(EMI) shielding are highly desirable for improving human comfort and safety. Herein, a multifunctional wearable carbon fibers(CF) @ polyaniline(PANI)/silver nanowires(Ag NWs) composites with a “branch-trunk” interlocked micro/nanostructure were achieved through "three-in-one" multi-scale design. The reasonable assembly of the three kinds of one-dimensional(1D) materials can fully exert their excellent properties i.e., the superior flexibility of CF, the robustness of PANI, and the splendid conductivity of Ag NWs. Consequently, the constructed flexible composite demonstrates enhanced mechanical properties with a tensile stress of 1.2 MPa, which was almost 6 times that of the original material. This is mainly attributed to the fact that the PNAI(branch) was firmly attached to the CF(trunk) through polydopamine(PDA), forming a robust interlocked structure. Meanwhile, the composite possesses excellent thermal insulation and heat preservation capacity owing to the synergistically low thermal conductivity and emissivity. More importantly, the conductive path of the composite established by the three 1D materials greatly improved its EMI shielding property and Joule heating performance at low applied voltage. This work paves the way for rational utilization of the intrinsic properties of 1D materials, as well as provides a promising strategy for designing wearable electromagnetic protection and thermal energy management devices. 展开更多
关键词 Electromagnetic shielding Multi-scale design One-dimensional materials Carbon fiber thermal management
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Electromagnetic and Stress Analyses of the ITER Equatorial Thermal Shield
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作者 雷明准 宋云涛 +1 位作者 王松可 汪献伟 《Plasma Science and Technology》 SCIE EI CAS CSCD 2013年第8期830-833,共4页
The ITER equatorial thermal shield is located inside the cryostat and outside the vacuum vessel, and its purpose is to provide a thermal shield from hot components to the superconducting magnets. Electromagnetic analy... The ITER equatorial thermal shield is located inside the cryostat and outside the vacuum vessel, and its purpose is to provide a thermal shield from hot components to the superconducting magnets. Electromagnetic analysis of the equatorial thermal shield was performed using the ANSYS code, because electromagnetic load was one of the main loads. The 40 sector finite element model was established including the vacuum vessel, equatorial thermal shield, and superconducting magnets. The main purpose of this analysis was to investigate the eddy current and electromagnetic force in the equatorial thermal shield during plasma disruption. Stress analysis was implemented under the electromagnetic load. The results show that the equatorial thermal shield can accommodate the calculated electromagnetic loads. 展开更多
关键词 TOKAMAK thermal shield finite element electromagnetic analysis ITER
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Preliminary Thermal Mechanical Analysis of the Equatorial Thermal Shield for ITER
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作者 雷明准 宋云涛 +4 位作者 杜世俊 叶民友 奚维斌 刘旭峰 刘辰 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第10期932-935,共4页
Thermal analysis of the equatorial thermal shield for ITER is conducted in order to confirm that the cooling tube design was reasonable under both the plasma operational and the baking operational conditions. The stru... Thermal analysis of the equatorial thermal shield for ITER is conducted in order to confirm that the cooling tube design was reasonable under both the plasma operational and the baking operational conditions. The structural performance was analyzed by means of the finite element software ANSYS. A comparison of the results with design requirements shows that the results of the simulation are within allowable design requirements, which indicates the feasibility and reliability of the equatorial thermal shield structure. 展开更多
关键词 ITER TOKAMAK thermal shield finite element analysis
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The Application of Radiation Shields for Thermal Control of Superheater Tubes in Boiler
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作者 Shahram Falahatkar Tayeb Pour-Reza Habib Karimi 《Energy and Power Engineering》 2012年第2期77-84,共8页
Superheater tubes temperature control is a necessity for long lifetime, high efficiency and high load following capability in boiler. This study reports a new approach for the control strategy design of boilers with s... Superheater tubes temperature control is a necessity for long lifetime, high efficiency and high load following capability in boiler. This study reports a new approach for the control strategy design of boilers with special shields. The presented control strategy is developed based on radiation thermal shields with low emissivity coefficient and high reflectivity or scattering coefficient. In order to simulate the combustion event in boiler and heat transfer to superheater tubes, an effective set of computational fluid dynamic (CFD) codes is used. Results indicate a successful identification of over- heated zones on platen superheater tubes and effect of radiation shields for solving this problem. 展开更多
关键词 Platen SUPERHEATER Heat TRANSFER COMBUSTION RADIATION thermal shieldS BOILER CFD
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Hydraulic and Thermal Calculation and Analysis of ITER Shield Block Module
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作者 KANG Weishan ZHANG Fu WU Jihong XU Zengyu 《Southwestern Institute of Physics Annual Report》 2005年第1期119-120,共2页
ITER blanket design has progressed significantly since 2001, which resulted in a reduction in cost and an increase in performance with respect to FDR 2001. One of the most important improvements is the new coolant flo... ITER blanket design has progressed significantly since 2001, which resulted in a reduction in cost and an increase in performance with respect to FDR 2001. One of the most important improvements is the new coolant flow configuration in the shield block ( SB ) . In the current design TM, the cooling circuit in the SB is a matrix of radial holes which are arranged in eight poloidal rows. The rows are fed in parallel by front headers and back drilled collectors, and merge in four couples through the front header. These four couples of rows are linked in series by transverse holes. In the current design, a special shape of flow driver is mounted inside the radial hole, and coolant flows through clearance between the driver and drilled radial hole, which allows achieving a high coolant velocity, 展开更多
关键词 shield block Hydraulic and thermal CFD code
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CFETR 胀板式杜瓦冷屏的初步设计与热分析
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作者 柴永生 崔立民 +3 位作者 葛剑 陈兆波 张龙 庞雪威 《核聚变与等离子体物理》 CAS CSCD 北大核心 2024年第1期36-42,共7页
为进一步减少托卡马克装置中超导磁体的热负荷,将胀板结构应用于杜瓦冷屏(CTS)中,代替传统管板式冷屏结构。胀板结构是一种在屏蔽板间形成冷却介质流动的夹层空间结构。选择304LN不锈钢作为CTS材料,选择模压-焊接作为CTS成型方式,选择... 为进一步减少托卡马克装置中超导磁体的热负荷,将胀板结构应用于杜瓦冷屏(CTS)中,代替传统管板式冷屏结构。胀板结构是一种在屏蔽板间形成冷却介质流动的夹层空间结构。选择304LN不锈钢作为CTS材料,选择模压-焊接作为CTS成型方式,选择氦气作为冷却剂。确定了最佳焊点参数及屏蔽板参数。首先根据辐射热原理计算杜瓦冷屏表面热流密度,然后应用流体仿真软件CFX对杜瓦冷屏进行热分析,得到了杜瓦冷屏面板温度及进出口压差。分析表明,胀板式杜瓦冷屏面板的温度分布均匀,相比管板式杜瓦冷屏有显著降低,理论上证明了胀板式杜瓦冷屏结构的优越性。 展开更多
关键词 CFETR 核聚变 杜瓦冷屏 热辐射 热分析
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考虑弹头滚转姿态变化影响的防热层厚度优化
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作者 单继祥 赵平 +1 位作者 何衍儒 杨鑫 《弹道学报》 CSCD 北大核心 2024年第1期10-17,共8页
基于气动热/结构温度响应耦合计算方法,研究了弹头固定攻角再入条件下锥身典型子午面结构温度响应特性,以及滚转姿态变化时刻对各子午面结构温度响应的影响,建立了考虑弹头滚转姿态变化影响的防热层厚度优化方法,并基于该方法开展了弹... 基于气动热/结构温度响应耦合计算方法,研究了弹头固定攻角再入条件下锥身典型子午面结构温度响应特性,以及滚转姿态变化时刻对各子午面结构温度响应的影响,建立了考虑弹头滚转姿态变化影响的防热层厚度优化方法,并基于该方法开展了弹头防热层厚度优化。最后,研究了滚转姿态变化次数对优化效果的影响。结果表明:在再入弹道前段进行滚转姿态变化可使外壁面气动加热量更为合理,有效降低弹体锥身壳体内壁面温升。当迎、背风面壳体内壁面最大温升约束为25 K时,与无滚转姿态变化状态下相比,滚转姿态变化设计可使防热层厚度减小0.725 mm,减小幅度为5.4%。通过与滚转姿态变化时刻的联合设计可有效降低锥身防热层厚度。与单次滚转姿态变化时相比,两次滚转姿态变化时防热层厚度减小量仅增大1.9%,增加滚转姿态变化次数对优化效果影响较小。 展开更多
关键词 气动热 再入攻角 滚转姿态变化 结构热响应 厚度优化
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熔盐堆下舱室非能动冷却系统的优化设计
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作者 梅牡丹 周翀 +2 位作者 傅瑶 邹杨 王纳秀 《核技术》 EI CAS CSCD 北大核心 2024年第8期107-118,共12页
熔盐堆下舱室非能动冷却系统是确保反应堆安全运行的重要保障,其结构设计是热工水力设计中的重要一环,其功能是保证熔盐堆下堆舱所有设备在反应堆正常运行时不超温,同时在事故工况下,能够最大程度地导出堆芯衰变热。基于一种热功率为153... 熔盐堆下舱室非能动冷却系统是确保反应堆安全运行的重要保障,其结构设计是热工水力设计中的重要一环,其功能是保证熔盐堆下堆舱所有设备在反应堆正常运行时不超温,同时在事故工况下,能够最大程度地导出堆芯衰变热。基于一种热功率为153 MWt的百兆瓦级熔盐堆的概念设计,建立了熔盐堆下堆舱的1/4结构模型,使用ANSYS FLUENT 20.1软件进行下堆舱三维流场与温度场的数值模拟,通过优化下舱室非能动冷却系统的结构布局、空气环腔的结构尺寸、隔热板上保温棉厚度以及进风管的入口位置,使得下舱室内双通道非能动空冷系统的热屏蔽效果最好,且在事故工况下导出堆芯衰变热最多。结果表明:改变空冷系统中空气环腔的结构尺寸对下堆舱热屏蔽结果的影响很小;在空冷系统的中间隔板上增加保温棉可以显著降低侧面混凝土墙的温度;冷却系统的进风管入口位置距离空冷环腔顶端越近热屏蔽效果越好。据此最终设计出了一种新型的下舱室内双通道非能动空冷系统,达到了153 MWt熔盐堆下堆舱的屏蔽冷却的设计要求。为未来大功率熔盐堆下舱室内非能动余热排出系统的工程优化设计提供了重要参考。 展开更多
关键词 熔盐堆下舱室 双通道非能动冷却系统 热屏蔽设计 结构优化 计算流体力学
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特长水下公路盾构隧道结构防火保护策略及关键参数研究
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作者 谢宝超 阳旖 +3 位作者 郭晨阳 戴伟强 赵蓓 陈珊娜 《土木工程学报》 EI CSCD 北大核心 2024年第4期92-101,共10页
特长水下公路盾构隧道普遍设置独立排烟道进行顶部集中排烟。现有隧道工程防火技术“护顶不护墙”,顶部设有排烟道时,顶部防火保护施加在烟道板上,而烟道层拱顶管片及车道层两侧管片不施加防火保护,存在安全隐患。根据隧道结构实际可能... 特长水下公路盾构隧道普遍设置独立排烟道进行顶部集中排烟。现有隧道工程防火技术“护顶不护墙”,顶部设有排烟道时,顶部防火保护施加在烟道板上,而烟道层拱顶管片及车道层两侧管片不施加防火保护,存在安全隐患。根据隧道结构实际可能受到的火灾高温作用,结合管片、烟道板结构相对重要性,提出了新的车道层侧墙管片、烟道层拱顶管片、烟道板结构防火保护策略,即车道层所有结构表面采用RABT火灾升温曲线,烟道层所有结构表面采用基于CFD模拟的火灾升温曲线,耐火极限均不小于2.0h,管片耐火极限由管片混凝土表面及距表面25mm处温度判定,烟道板耐火极限由烟道板的极限弯曲变形量和极限弯曲变形速率判定。基于所提出的防火保护策略,开展数值模拟及耐火试验研究,确定了防火保护技术参数。结果表明:车道层侧墙管片防火保护层等效热阻应不小于0.10℃·m~2/W;烟道层拱顶管片防火保护层等效热阻在排烟口处不小于0.10℃·m~2/W,且随距排烟口距离的增大逐渐减小,距离排烟口16m处减小为零;隧道侧墙常用装饰材料搪瓷钢板在火灾过程中易发生变形而脱落;无防火保护烟道板耐火极限大于2.0h,掺加PP纤维、钢纤维可提升烟道板的耐火性能。 展开更多
关键词 特长隧道 盾构管片 烟道板 防火保护策略 等效热阻
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