丁胞型强化换热管内突起结构对流传热及阻力的数值模拟

摘要

Numerical simulations were conducted to study the heat transfer performance and characteristics of pres-sure loss for the protrusions in dimpled tubes,and the results were compared with the experimental results from other essay. The results show that even though protrusion in dimpled tube lower part of the local heat transfer coefficient, the global average heat transfer coefficient has been enhanced,and with the increase of the Reynolds number,the effect of heat transfer is much clearer. At the same time,pressure drop increases due to form drag.%采用SIMPLE算法求解RNG k-ε方程，分析丁胞强化换热管管内流动传热情况，研究管内侧突起结构对于单相气体流动过程的强化传热性能和压力损失，并和文献中的实验值进行对比。结果表明，丁胞管管内突起虽会使突起左右两侧局部换热系数减小，但总体上是增强了换热性能，且随着 Re 的增加强化换热效果更明显。同时也因形阻力增大了流动阻力。