微型换热器的实验研究.pdfVIP

　试 　验 　研 　究　 微型换热器的实验研究 清华大学热能工程系 　姜培学 　李 　勐 　马永昶 　任泽霈 摘 　要 :对微槽式微型换热器和烧结网丝多孔式微型换热器的传热与流动性能进行了实验研究, 并 对几种微型换热器的综合性能进行了评价 。结果表明:根据单位体积传热系数的大小, 几种微型换 热器的传热性能从好到差依次为 :烧结颗粒多孔式微型换热器 、浅槽微型换热器 、深宽比为 3 ∶1 的 深槽微型换热器 、烧结网丝多孔式微型换热器 、深宽比为 6 ∶1 的深槽微型换热器 。但烧结颗粒及烧 结网丝多孔式微型换热器的压力损失比较大; 从传热和阻力损失两个方面综合评价, 深槽结构微型 换热器优于其他几种微型换热器 。 关键词 :深槽结构微型换热器; 网丝多孔式微型换热器; 传热性能; 流动阻力 ( ) 中图分类号 :TK124 　　文献标识码 :A 　　文章编号 :1001 - 4837 2003 02 - 0008 - 05 Experimental Research on Micro Heat Exchangers Tsinghua University 　JIANG Pei - xue 　L I Meng 　MA Yong - chang 　REN Ze - pei Abstract :Fluid flow and forced convection heat transfer in micro heat exchangers with either micro channels or sintered metallic mesh have been investigated experimentally and the estimation of the overall performance has been conducted . The results indicated that the heat transfer performance of the sintered porous media micro heat exchanger is best , the heat transfer performance followed by the shallow channel micro heat exchanger , then the deep channel micro heat exchanger with ratio 3 ∶1 of deepness to width of the channel , the sintered metal mesh heat exchanger , and the deep channel micro heat exchanger with ratio 6 ∶1 of deepness to width of the channel . But the pressure drop of the heat exchangers using sintered metallic particles and sintered metal mesh are much larger . Considering both of the heat transfer and pressure drop characteristics of these heat ex changers , the deep micro channel design offers a better overall performance than other alternatives. Key words :deep channel micro heat exchanger ; sintered metal mesh heat exchanger ; heat transfer ;pressure drop