The dimpled fin has excellent heat transfer performance and has attracted a lot of attention to apply on the fin and tube heat exchanger. A study presents to investigate the effects of number of tube rows on the air-side heat transfer characteristics of dimpled fin for velocity ranging from 1 to 3 m/s. The Q/Delta P and Q/((Delta P x V)) are used to evaluate the heat transfer performance of the heat exchanger. The results show that the dimpled arrangement can change the mainstream direction, increase the disturbance, and enhance the heat transfer. With the increase of the number of tube rows, the average Nusselt number decreases and Q/Delta P and Q/((Delta P x V)) increase gradually. Compared with the multipipe tube rows, the performance of two-row tube is better.
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机译：波纹状翅片具有优异的热传递性能，并且在翅片和管式热交换器上的应用引起了很多关注。一项研究提出，研究速度为1至3 m / s时，管排数对凹翅片空气侧传热特性的影响。 Q / Delta P和Q /（（Delta P x V））用于评估热交换器的传热性能。结果表明，凹坑排列可以改变主流方向，增加扰动，增强传热。随着管排数的增加，平均努塞尔数减少，并且Q /ΔP和Q /（（ΔP×V））逐渐增加。与多管排相比，两排管的性能更好。
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