摘要
对空气横掠沉没于多孔泡沫金属中正三角错列传热管束的对流传热进行了试验研究。结果显示,多孔泡沫金属使得流体的流动阻力明显增加,但阻力增加的倍数随Reynolds数的增大而减小;多孔泡沫金属对对流传热具有明显的强化作用,强化效果随Re的增大而减小。与横掠错列光管束相比,本试验范围内,流动阻力增加的最大倍数为12.727,最小倍数为10.109;对流传热的最大强化倍数为2.78,最小强化倍数为2.08。总结出了适合于试验范围的对流传热的气流量纲1阻力系数的表达式和传热计算关联式。综合强化对流传热及增加流动压降两方面可知,多孔泡沫金属较适合于流体较小流速的场合。
The convection heat transfer of forced air flow across a triangle staggered tube bank embedded in porous metal foam was investigated experimentally. The results show that the resistance of fluid flow increases obviously because of the porous metal foam, but the increase rate decreases with the increase of Reynolds number. Porous metal foam greatly enhances the convection heat transfer. The enhancement effect decreases with the increase of Reynolds number. In the experimental range, the flow resistance increases 10. 109--12. 727 times that of plain tube bank, while the enhancement of convection heat transfer is 2.08--2.78 times. The correlations for non-dimensional resistance coefficient and the Nusselt number are obtained in the experimental range. It is concluded that the porous metal foam is more suitable for the low velocity of fluid from aspects of heat transfer enhancement and flow resistance.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2011年第12期3394-3398,共5页
CIESC Journal
基金
江苏省科技计划基金项目(BK2004214)
关键词
多孔泡沫金属
横掠管束
对流传热
porous metal foam
flow across tube bank
convection heat transfer
