Correlations for solar air heater duct with dimpled shape roughness elements on absorber plate

被引：200

作者：

Sethi, Muneesh ^{[2
]}

Varun ^{[1
]}

Thakur, N. S. ^{[3
]}

机构：

[1] Natl Inst Technol, Dept Mech Engn, Hamirpur 177005, India

[2] Shoolini Univ, Sch Engn & Technol, Bajhol 173212, Solan, India

[3] Natl Inst Technol, Ctr Excellence Energy & Environm, Hamirpur 177005, India

来源：

SOLAR ENERGY | 2012年 / 86卷 / 09期

关键词：

Dimple shaped; Heat transfer; Nusselt number; Solar air heater; FRICTION FACTOR CORRELATIONS; ARTIFICIALLY ROUGHENED DUCTS; RIB ROUGHNESS; PERFORMANCE;

D O I：

10.1016/j.solener.2012.06.024

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

An experimental investigation has been carried out for a range of system and operating parameters in order to analyse the effect of artificial roughness on heat transfer and friction characteristics in solar air heater duct which is having dimple shaped elements arranged in angular fashion (arc) as roughness elements on absorber plate. Duct has an aspect ratio (W/H) of 11, relative roughness pitch (p/e) range of 10-20, relative roughness height (e/D-h) range of 0.021-0.036, arc angle (alpha) range of 45-75 degrees and Reynolds number (Re) ranges from 3600 to 18,000. A considerable increase in heat transfer and friction loss has been observed. The experimental data have been used to develop Nusselt number and friction factor correlations as a function of roughness parameters and operating parameters. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：2852 / 2861

页数：10

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