ABSTRACT

This paper presents an experimental study carried out to investigate the influence of different performance parameters on heat transfer and fluid flow characteristics of a roughened double pass duct provided with combination of discrete multi V and staggered shaped ribs. The investigation has covered the range of operating parameter, i.e. Reynolds number (Re) from 3000 to 21000, and roughness parameters, i.e. relative inclined gap distance (I_g/L_v) from 0.4 to 0.8, and angle of attack (α) from 30° to 75° while the other roughness parameters are kept as constant. The Nusselt number, friction factor, and thermohydraulic performance for the artificially roughened double pass duct have been investigated. The results of the study have been compared with that of double-pass channel without roughness and considerable enhancement in the performance of the duct has been achieved. Based on the experimental results, the optimum values of roughness and operating parameters have also been identified. Further, the pumping power reduction to circulate the air has also been investigated.

摘要

本文介绍了一项实验研究，以研究不同性能参数对粗糙双通道管道的传热和流体流动特性的影响，该管道具有离散的多 V 形和交错形肋的组合。调查涵盖了工作参数范围，即雷诺数（Re）从3000到21000，粗糙度参数，即相对倾斜间隙距离（I _g /L _v) 从 0.4 到 0.8，攻角 (α) 从 30° 到 75°，而其他粗糙度参数保持不变。研究了人工粗化双通道管道的努塞尔数、摩擦系数和热工水力性能。该研究的结果已与无粗糙度的双通道通道进行了比较，并显着提高了管道的性能。根据实验结果，还确定了粗糙度和操作参数的最佳值。此外，还研究了用于循环空气的泵送功率降低。