【摘要】 本文通过搭建流动与换热实验平台,对10 PPI,30 PPI,70 PPI三种不同孔密度的不锈钢金属泡沫填充管的换热性能进行了实验研究,分析了管内入口雷诺数、入口温度以及孔密度对管外壁Nu数的影响。研究结果表明,金属泡沫填充管的换热强度较光管条件下提高,且30 PPI和70 PPI的换热强度都大于10 PPI填充管的换热强度;在本文的研究工况下,金属泡沫填充管的管外壁Ⅳu数随管内雷诺数的增大变化不明显,随管内入口温度的增加而增大;三种金属泡沫填充管的换热综合评价因子都大于1,且基本不随雷诺数的变化而变化。更多还原

【Abstract】 The experimental setup for the investigation of heat transfer and fluid flow in metal foam filled tubes was built.Three tubes filled with different stainless steel foam were under investigated.The pore density of the metal foam is 10 PPI,30 PPI and 70 PPL The effects of Reynolds number,the inlet temperature as well as the pore density on the outer wall Nusslet number were analyzed in detail.The results showed that the heat transfer rate is enhanced in metal foam filled tubes compared to the smooth tube and the heat transfer rates in 30 PPI and 70 PPI metal foam filled tubes are higher than the 10 PPI metal foam filled tube.Under the present working condition,the Reynolds number of the inside flow has little effect on the outer wall Nusslet number and the outer wall Nusslet number increased with the increase of the inlet temperature.The comprehensive performance evaluation criteria of the three metal foam filled tubes is higher than 1 and is little affected by the Reynolds number.更多还原