Investigation of thermo-fluid behavior of mixed convection heat transfer of different dimples-protrusions wall patterns to heat transfer enhancement

被引：13

作者：

Sobhani, M. ^{[1
]}

Behzadmehr, A. ^{[1
]}

机构：

[1] Univ Sistan & Baluchestan, Mech Engn Dept, Zahedan, Iran

来源：

HEAT AND MASS TRANSFER | 2018年 / 54卷 / 11期

关键词：

TURBULENT CONVECTION; SUPERCRITICAL WATER; PRESSURE-DROP; FLUID-FLOW; TUBES; PERFORMANCE; BUOYANCY;

D O I：

10.1007/s00231-018-2356-9

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This study is a numerical investigation of the effect of improving heat transfer namely, modified rough (dimples and protrusions) surfaces on the mixed convective heat transfer of a turbulent flow in a horizontal tube. The effects of different dimples-protrusions arrangements on the improving the thermal performance of a rough tube are investigated at various Richardson numbers. Three dimensional governing equations are discretized by the finite-volume technique. Based on the obtained results the dimples-protrusions arrangements are modified to find a suitable configuration for which heat transfer coefficient and pressure drop to be balanced. Modified dimples-protrusions arrangements that shows higher performance is presented. Its average thermal performance 18% and 11% is higher than the other arrangements. In addition, the results show that roughening a smooth tube is more effective at the higher Richardson number.

引用

页码：3219 / 3229

页数：11

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