矩肋强化换热通道中三维湍流流动与换热特性的数值模拟

Prediction of 3-D Turbulent Flow and Heat Transfer in a Channel With Longitudinal Periodical Rectangular Fins

对沿流向间断性布置矩肋的新型强化换热通道在Ｒｅ＝５×１０３～５×１０４的湍流范围内采用Ｋ－ε湍流模型进行了数值计算，并与实验结果进行了比较．计算结果表明，在相同质量流量下此种强化换热通道的换热系数可以达到光滑通道换热系数的４～９倍．减小通道截面高宽比使得强化换热效果增强．

A new enhanced-configuration channel with longitudinal periodical rectangularfins on the top and bottom wall, was studied numerically to predict its turbulentcharacteristics of flow and heat transfer. In the numerical study, K- turbulence modelwas adopted in the range of Reynolds numbers covering from 5×103 to 5×104. Andthe results from numerical study were compared with the result from relating experiments.The numerical results showed that the heat transfer coefficient of the new configurationcould reach 4 to 9-fold that of the smooth duct,while decreasing the aspect ratio ofthe height over the width of the duct is beneficial to the enhancement effect