Numerical investigation of flow and heat transfer in enhanced tube with slot dimples

被引：1
作者：
Liang Zhang
Shuai Xie
Zheng Liang
Jie Zhang
Yulin Wang
Wei Chen
Chunyan Kong
机构：
[1] Southwest Petroleum University,School of Mechatronic Engineering
[2] Si Chuan Chuan Guo Ketaida Energy Technology Co.,School of Mechanical Engineering
[3] Ltd,undefined
[4] Xihua University,undefined
来源：
Heat and Mass Transfer | 2019年 / 55卷
关键词：
Slot dimple; Spherical/elliptical dimple; Heat transfer enhancement; Thermal performance;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In this paper, a novel enhanced tube with slot dimples aiming to improve heat transfer have been put forward. The flow and heat transfer characteristics of the enhanced tube with slot dimples (ETSD) were numerically analysed and compared with spherical/elliptical dimples. The distributions of temperature, velocity, pressure, Nusselt number and streamlines were carried out to describe the mechanism of heat transfer and fluid flow. Additionally, the effects of dimple depth, length and axis ratios on turbulent fluid flow and heat transfer performances were also being studied in details. It is found that the enhanced tube with slot dimples have an advantage for augmented heat transfer rate compared with the spherical/elliptical dimple tube due to the slot dimples generated greater swirling flow, better fluid mixing, and greater flow blockage. In addition, the slot dimples destroyed the boundary layer, intense flow mixing and formed periodic impinge flows, thus significant improved of thermal–hydraulic performance. The Nu/Nu0 and f/f0 for ETSD increases with the increasing of dimples depth, and decreases with increasing of pitch. The ETSD with D = 1.5 mm, P = 30 mm, R = 2.33 and Re = 5000 provided the largest PEC value about 2.02 in all the case.
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页码：3697 / 3709
页数：12
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