Experimental investigation of convective heat transfer and pressure loss in a round tube fitted with circular-ring turbulators☆
Experimental investigation of convective heat transfer and pressure loss in a round tube fitted with circular-ring turbulators☆
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DOI：
10.1016/j.icheatmasstransfer.2009.12.016
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发表时间：
2010-05
影响因子：
7
通讯作者：
V. Kongkaitpaiboon;K. Nanan;S. Eiamsa-ard
中科院分区：
文献类型：
--
作者：
V. Kongkaitpaiboon;K. Nanan;S. Eiamsa-ard
本文研究了环形湍流器（CRT）对换热管内传热和流体摩擦特性的影响。湍流是通过插入具有不同几何形状的crt产生的，包括三种不同的直径比（DR=d/ d =0.5, 0.6和0.7）和三种不同的节距比（PR=p/ d = 6,8和12）。在实验装置中，环境空气在27℃下通过试管，试管在均匀壁面热流密度条件下进行控制。雷诺数从4000到20000不等。根据实验结果，与普通管相比，安装了crt的管中的传热率增加了57%至195%，具体取决于操作条件。此外，结果还表明，最小的间距和直径比的阴极射线管具有最高的传热率和最大的压力损失。
This research is conducted to study the effect of the circular-ring turbulator (CRT) on the heat transfer and fluid friction characteristics in a heat exchanger tube. The turbulent flow is produced by insertion of CRTs with various geometries, including three different diameter ratios (DR=d/D=0.5, 0.6 and 0.7) and three different pitch ratios (PR=p/D=6, 8 and 12). In the experimental setup, the ambient air at 27°C is passed through the test tube which is controlled under uniform wall heat flux condition. The Reynolds number was varied from 4000 to 20,000. According to the experimental results, heat transfer rates in the tube fitted with CRTs are augmented around 57% to 195% compared to that in the plain tube, depending upon operating conditions. In addition, the results also reveal the CRT with the smallest pitch and diameter ratios offers the highest heat transfer rate in accompany with the largest pressure loss.