Experimental investigation of convective heat transfer and pressure loss in a round tube fitted with circular-ring turbulators

被引：117

作者：

Kongkaitpaiboon, V. ^{[1
]}

Nanan, K. ^{[1
]}

Eiamsa-ard, S. ^{[1
]}

机构：

[1] Mahanakorn Univ Technol, Fac Engn, Dept Mech Engn, Bangkok 10530, Thailand

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2010年 / 37卷 / 05期

关键词：

Heat transfer enhancement; Friction factor; Thermal performance; Circular-ring turbulator (CRT); Turbulator; CONICAL-NOZZLE TURBULATORS; FRICTION CHARACTERISTICS; TRANSFER AUGMENTATION; TRANSFER ENHANCEMENT; TRANSFER BEHAVIORS; RIB TURBULATORS; SNAIL ENTRY; INSERTS; PERFORMANCE;

D O I：

10.1016/j.icheatmasstransfer.2009.12.016

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This paper presents the effect of the circular-ring turbulator (CRT) on the heat transfer and fluid friction characteristics in a heat exchanger tube. The experiments were conducted 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). During the test air at 27 degrees C was passed through the test tube which was 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. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：568 / 574

页数：7

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