摘要
基于GPM(梯度多孔材料)的优良特性,本工作设计了GPM部分填充圆管强化换热的结构。当Rp(多孔材料填充率)为0.8时,结合管内充分发展段的速度分布图、管内流动阻力系数和平均Nu数,分别研究了dp(填充梯度孔径)多孔材料、ε(梯度孔隙率)多孔材料对于管内流体流动以及传热特性的影响规律,并将其与HPM(均匀多孔材料)填充圆管时的结果做了对比分析。在此基础上,比较了各种多孔材料填充结构的换热与流动综合评价性能(简称PEC)。结果表明,通过合理设计GPM的结构,能够在强化换热的基础上,有效地降低圆管流动阻力,从而得到较好的综合评价性能(PEC)。
Inspired by the unique properties of gradient porous material( GPM),the authors proposed a novel design to enhance the heat transfer in pipes by filling them with GPMs. When Rp( GPM filling ratio) is 0. 8,the effects of gradient pore-size and gradient porosity on the flow and heat transfer performance were studied by examining velocity distribution,friction factor and averaged Nusselt number. The flow and heat transfer performances of GPM filled pipes were also compared with the ones filled by homogeneous porous materials( HPM). Moreover,a tradeoff analysis between the GPM and HPM design on the thermal and flow properties was also conducted. The results showed that the pipes with GPM configuration can effectively enhance heat transfer and reduce the flow resistance in comparison with conventional HPM design.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第8期12-17,120-121,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家自然科学基金资助项目(51373153)
中国博士后科学基金资助项目(2014M560483)
国家留学基金资助项目(201406320096)
关键词
梯度多孔材料
流体流动
强化传热
数值模拟
gradient-porous materials
fluid flowing
heat transfer enhancement
numerical simulation
