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Preparation and Characterization of Mullite-Silicon Carbide Heat Absorbing Ceramics for Solar Thermal Tower Plant 被引量:1
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作者 徐晓虹 RAO Zhenggang +3 位作者 WU Jianfeng ZHOU Yang HE Dezhi LIU Yi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第1期27-32,共6页
The in-situ synthesized mullite bonded SiC ceramics for solar thermal tower plant were prepared from Silicon carbide (SIC), manufactured aluminum hydroxide (Al(OH)3) and Suzhou kaolin via semi-dry pressing and p... The in-situ synthesized mullite bonded SiC ceramics for solar thermal tower plant were prepared from Silicon carbide (SIC), manufactured aluminum hydroxide (Al(OH)3) and Suzhou kaolin via semi-dry pressing and pressureless firing. The results indicate that sample B3 (designed mullite content 15 wt%) fired at 1 400 ℃ exhibited optimal performance with a bending strength of 97.41 MPa. Sample B3 can withstand 30-cycles thermal shock without cracking (wind cooling from 1 100 ℃ to room temperature), and the bending strength after thermal shock decreased by 17.92%. When the service temperature is 600℃, the thermal diffusivity, specific heat capacity, thermal conductivity and heat capacity are 6.48× 10-2 cm:.s-1, 0.69 kJ·kg-1. K-1, 9.62 W·m-1·K-1 and 977.76 kJ·kg-1, respectively. The XRD and SEM results show that SiC, mullite, or-quartz, and tridymite are connected closely, which gives the material a good bending strength. After 30-time thermal shock cycles, the structure of samples becomes loose. SiC grains are intersectingly arranged with rodshape mullite, exhibiting a favorable thermal shock resistance. The addition of Al(OH)3 and Suzhou kaolin can accelerate the synthesis of mullite, thus to reduce the firing temperature effectively. The volume effect of tfidymite is relatively small, improving the thermal shock resistance of materials. A higher designed muUite content yields a lower loss rate of bending strength. The mullite content should not be more than 15 wt% or else the bending strength would be diminished. 展开更多
关键词 heat absorbing materials mullite-SiC composite ceramics thermal shock resistance thermal properties
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Unsteady natural convection Couette flow of heat generating/absorbing fluid between vertical parallel plates filled with porous material
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作者 B.K.JHA M.K.MUSA 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2012年第3期303-314,共12页
The extended Brinkman Darcy model for momentum equations and an energy equation is used to calculate the unsteady natural convection Couette flow of a viscous incompressible heat generating/absorbing fluid in a vertic... The extended Brinkman Darcy model for momentum equations and an energy equation is used to calculate the unsteady natural convection Couette flow of a viscous incompressible heat generating/absorbing fluid in a vertical channel (formed by two infinite vertical and parallel plates) filled with the fluid-saturated porous medium. The flow is triggered by the asymmetric heating and the accelerated motion of one of the bounding plates. The governing equations are simplified by the reasonable dimensionless parameters and solved analytically by the Laplace transform techniques to obtain the closed form solutions of the velocity and temperature profiles. Then, the skin friction and the rate of heat transfer are consequently derived. It is noticed that, at different sections within the vertical channel, the fluid flow and the temperature profiles increase with time, which are both higher near the moving plate. In particular, increasing the gap between the plates increases the velocity and the temperature of the fluid, however, reduces the skin friction and the rate of heat transfer. 展开更多
关键词 heat generating/absorbing fluid natural convection flow porous material acceleration motion
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Earth Absorbing More Heat than It Radiates
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作者 Fred Pearce 孙凤 《当代外语研究》 2005年第6期2-3,共2页
根据最新的大气“能量预算”模拟研究,地球吸收自太阳的能量要比其释放的多,而海洋成为大部分未释放能量的最终贮藏室。这使得海洋温度上升,也会因此导致地球气候变化。由于海洋变暖仍需要几十年的时间,这一时间间歇无异于将全地气候改... 根据最新的大气“能量预算”模拟研究,地球吸收自太阳的能量要比其释放的多,而海洋成为大部分未释放能量的最终贮藏室。这使得海洋温度上升,也会因此导致地球气候变化。由于海洋变暖仍需要几十年的时间,这一时间间歇无异于将全地气候改变设置为一颗定时炸弹…… 展开更多
关键词 贮藏室 Earth Absorbing More heat than It Radiates
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