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Paraffin–CaCl_(2)·6H_(2)O dosage effects on the strength and heat transfer characteristics of cemented tailings backfill
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作者 Hai Li Aibing Jin +2 位作者 Shuaijun Chen Yiqing Zhao You Ju 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CSCD 2024年第1期60-70,共11页
The challenge of high temperatures in deep mining remains harmful to the health of workers and their production efficiency The addition of phase change materials (PCMs) to filling slurry and the use of the cold storag... The challenge of high temperatures in deep mining remains harmful to the health of workers and their production efficiency The addition of phase change materials (PCMs) to filling slurry and the use of the cold storage function of these materials to reduce downhole temperatures is an effective approach to alleviate the aforementioned problem.Paraffin–CaCl_(2)·6H_(2)O composite PCM was prepared in the laboratory.The composition,phase change latent heat,thermal conductivity,and cemented tailing backfill (CTB) compressive strength of the new material were studied.The heat transfer characteristics and endothermic effect of the PCM were simulated using Fluent software.The results showed the following:(1) The new paraffin–CaCl_(2)·6H_(2)O composite PCM improved the thermal conductivity of native paraffin while avoiding the water solubility of CaCl_(2)·6H_(2)O.(2) The calculation formula of the thermal conductivity of CaCl_(2)·6H_(2)O combined with paraffin was deduced,and the reasons were explained in principle.(3) The“enthalpy–mass scale model”was applied to calculate the phase change latent heat of nonreactive composite PCMs.(4)The addition of the paraffin–CaCl_(2)·6H_(2)O composite PCM reduced the CTB strength but increased its heat absorption capacity.This research can give a theoretical foundation for the use of heat storage backfill in green mines. 展开更多
关键词 paraffin–CaCl_(2)·6H_(2)O heat transfer simulation heat calculation phase change material-based backfill latent heat of formula
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Study on the Influence of Piloti on Mean Radiant Temperature in Residential Blocks by 3-D Unsteady State Heat Balance Radiation Calculation 被引量:1
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作者 Tian-Yu Xi Jian-Hua Ding Hong Jin 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2014年第4期91-95,共5页
Piloti is commonly used in tropical and subtropical climate zones to get high wind velocity and create shadowed areas in order to optimize the living environment of residential blocks,but there are few studies to reve... Piloti is commonly used in tropical and subtropical climate zones to get high wind velocity and create shadowed areas in order to optimize the living environment of residential blocks,but there are few studies to reveal the influence of piloti on the radiant environment of residential blocks systematically. Taking the city of Guangzhou as an example,using 3-D Unsteady State Heat Balance Radiation Calculation Method,this paper shows that the mean radiant temperature( MRT) under piloti area increases with the increase of piloti ratio,and especially when piloti ratio is equal to 100%,the MRT increase trend becomes sharp. The MRT of exposed area decreases with the increase of piloti ratio,especially when piloti ratio reaches 100%,the decrease trend of MRT becomes sharp,which offers the reference for the study on piloti design in subtropical climate zones and further research on living environment by CFD simulation in residential blocks. 展开更多
关键词 piloti mean radiant temperature 3-D unsteady state heat balance radiation calculation residential block
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Numerical Simulation on Subcooled Boiling Heat Transfer Characteristics of Water-Cooled W/Cu Divertors 被引量:2
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作者 韩乐 常海萍 +1 位作者 张镜洋 许铁军 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第4期347-352,共6页
In order to realize safe and stable operation of a water-cooled W/Cu divertor under high heating condition,the exact knowledge of its subcooled boiling heat transfer characteristics under different design parameters i... In order to realize safe and stable operation of a water-cooled W/Cu divertor under high heating condition,the exact knowledge of its subcooled boiling heat transfer characteristics under different design parameters is crucial.In this paper,subcooled boiling heat transfer in a water-cooled W/Cu divertor was numerically investigated based on computational fluid dynamic(CFD).The boiling heat transfer was simulated based on the Euler homogeneous phase model,and local differences of liquid physical properties were considered under one-sided high heating conditions.The calculated wall temperature was in good agreement with experimental results,with the maximum error of 5%only.On this basis,the void fraction distribution,flow field and heat transfer coefficient(HTC)distribution were obtained.The effects of heat flux,inlet velocity and inlet temperature on temperature distribution and pressure drop of a water-cooled W/Cu divertor were also investigated.These results provide a valuable reference for the thermal-hydraulic design of a water-cooled W/Cu divertor. 展开更多
关键词 water-cooled W/Cu divertor subcooled boiling heat transfer characteristic numerical calculation
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A calculation method of the sensible heat flux by sodar
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作者 Lu Naiping, Li Shiming, Chen Jingnan, Zheng Yueming Zhou Mingyu National Recsearch Center for Marine Environmcntul Forecasts, Beijing, China 《Acta Oceanologica Sinica》 SCIE CAS CSCD 1989年第2期191-198,共8页
During the second course of USA - PRC joint air sea interaction experiment in 1986, the temperature structure parameters CT2 were measured by sodar over the Western Pacific Ocean. Based on similarity theory, a method ... During the second course of USA - PRC joint air sea interaction experiment in 1986, the temperature structure parameters CT2 were measured by sodar over the Western Pacific Ocean. Based on similarity theory, a method is discussed to calculate the sensible heat flux over the ocean in unstable stratification. Becausehumidity is great over the ocean, so we have to consider the influence of water vapor structure parameter Ce2and the correlation coefficient betweene and T on the calculation of sensible heat flux using CT2 profiles measured by sodar. A new formula is suggested in terms of parameterization. The sensible heat flux calculated by sodar measurements is compared with that by bulk transfer method, and the results agree well. 展开更多
关键词 HEAT A calculation method of the sensible heat flux by sodar
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A Calorimetric Study Assisted with First Principle Calculations of Specific Heat for Si-Ge Alloys within a Broad Temperature Range
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作者 王庆 王海鹏 +2 位作者 耿德路 李明星 魏炳波 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第12期37-40,共4页
Calorimetric measurements are performed to determine the specific heat of Si-xat.% Ge(where x = 0, 10, 30,50, 70, 90 and 100) alloys within a broad temperature range from 123 to 823 K. The measured specific heat incre... Calorimetric measurements are performed to determine the specific heat of Si-xat.% Ge(where x = 0, 10, 30,50, 70, 90 and 100) alloys within a broad temperature range from 123 to 823 K. The measured specific heat increases dramatically at low temperatures, and the composition dependence of specific heat is evaluated from the experimental results. Meanwhile, the specific heat at constant volume, the thermal expansion, and the bulk modulus of Si and Ge are investigated by the first principle calculations combined with the quasiharmonic approximation. The negative thermal expansion is observed for both Si and Ge. Furthermore, the isobaric specific heat of Si and Ge is calculated correspondingly from OK to their melting points, which is verified by the measured results and accounts for the temperature dependence in a still boarder range. 展开更多
关键词 Ge Si A Calorimetric Study Assisted with First Principle Calculations of Specific Heat for Si-Ge Alloys within a Broad Temperature Range
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Planck’s Oscillators at Low Temperatures and Haken’s Perturbation Approach to the Quantum Oscillators Reconsidered
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作者 Stanisław Olszewski 《Journal of Modern Physics》 2021年第12期1721-1728,共8页
In the first step the extremal values of the vibrational specific heat and entropy represented by the Planck oscillators at the low temperatures could be calculated. The positions of the extrema are defined by the dim... In the first step the extremal values of the vibrational specific heat and entropy represented by the Planck oscillators at the low temperatures could be calculated. The positions of the extrema are defined by the dimensionless ratios between the quanta of the vibrational energy and products of the actual temperature multiplied by the Boltzmann constant. It became evident that position of a local maximum obtained for the Planck’s average energy of a vibration mode and position of a local maximum of entropy are the same. In the next step the Haken’s time-dependent perturbation approach to the pair of quantum non-degenerate Schr<span style="white-space:nowrap;">?</span>dinger eigenstates of energy is re-examined. An averaging process done on the time variable leads to a very simple formula for the coefficients entering the perturbation terms. 展开更多
关键词 Planck’s Quantum Oscillators at Low Temperatures Calculation of the Extremal Specific Heat of the Oscillator Energy and Extremal Entropy Simplified Haken’s Time-Dependent Approach to the Perturbation Energy of a Non-Degenerate Quantum State
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Research on Marine Boiler's Pressurized Combustion and Heat Transfer 被引量:3
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作者 PingjianMING RenqiuJIANG YanjunLI BaozhiSUN 《Journal of Thermal Science》 SCIE EI CAS CSCD 2005年第1期76-80,共5页
The effect of pressure on combustion and heat transfer is analyzed. The research is based on the basic combustion and heat transfer theorem. A correction for the heat calculation method for pressurized furnace is made... The effect of pressure on combustion and heat transfer is analyzed. The research is based on the basic combustion and heat transfer theorem. A correction for the heat calculation method for pressurized furnace is made on the basis of the normal pressure case. The correction takes the effect of pressurizing into account. The results show that the correction is reasonable and the method is applicable to combustion and heat transfer of the marine supercharged boiler. 展开更多
关键词 marine boiler pressurized combustion radiant heat transfer heat calculation method.
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Numerical simulation research on surface radiation heat calculation of spacecraft in orbit whole course 被引量:1
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作者 SUN Bing ZHANG Tao 《航空动力学报》 EI CAS CSCD 北大核心 2010年第10期2229-2237,共9页
The surface radiation heat simulation program based on Microsoft VC++ 6.0 for spacecraft in whole orbit course was presented.Due to complexity of spacecraft structure,the spacecraft structures were decomposed to relat... The surface radiation heat simulation program based on Microsoft VC++ 6.0 for spacecraft in whole orbit course was presented.Due to complexity of spacecraft structure,the spacecraft structures were decomposed to relatively regular parts.Automatic generation of calculation grid was conducted by using structured grid and unstructured technology.Simulation mainly solved automatic grid generation for arbitrary surface and data transmission between arbitrary shape interfaces,and the geometry structure,physical process,calculation accuracy and efficiency were considered.View factors and radiation transfer coefficients were calculated by combining finite element method and ray uniform distribution.According to the position of surface cells,external heat flux was calculated with integral method for non-shaded surface and with ray uniform distribution method for shaded surface.As the spacecraft surface was wrapped with multilayer insulation material,the temperature field of multilayer insulation material was calculated with nodal network method and finite volume method.The temperature of other parts without wrap was calculated with finite element method.The temperature of unconnected regions available with radiation heat transfer relations was analyzed,and the calculation formulae were deduced.Numerical experiment shows that the simulation program is correct and effective. 展开更多
关键词 SPACECRAFT RADIATION heat calculation whole course numerical simulation
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Calculations of heat of solvation by a simple electrostatic approach to molecular interactions
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作者 CACHAU,R.E. VILLAR,H.O. CASTRO,E. A. Instituto de Investigaciones Fisicoquímicas Teóricasy Aplicadas(INIFTA),División Quimica Teórica,Facultad de Ciencias Exactas,Universidad National de La Plata,Casilla de Correo 16,Sucursal 4,La Plata 1900,Argentina 《Chinese Journal of Chemistry》 SCIE CAS CSCD 1992年第2期107-116,共0页
An extremely simple formula to estimate the heat of formation of complexes between an ion and a polar molecule or between highly polar systems is presented.The formula is entirely electrostatic and the expression used... An extremely simple formula to estimate the heat of formation of complexes between an ion and a polar molecule or between highly polar systems is presented.The formula is entirely electrostatic and the expression used is verified by means of perturbation theory.This formula is test- ed for several ion-molecule and molecule-molecule pairs.It is also applied to estimate the heat of hydration of simple salts. 展开更多
关键词 Calculations of heat of solvation by a simple electrostatic approach to molecular interactions HEAT
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