Thermal performance investigation of a solar air heater having discrete V-shaped perforated baffles

被引：19

作者：

Jain, Sheetal Kumar ^{[1
]}

Misra, Rohit ^{[2
]}

Kumara, Abhishek ^{[1
]}

Agrawala, Ghanshyam Das ^{[1
]}

机构：

[1] Malaviya Natl Inst Technol, Dept Mech Engn, Jaipur, Rajasthan, India

[2] Govt Engn Coll, Dept Mech Engn, Ajmer, India

来源：

INTERNATIONAL JOURNAL OF AMBIENT ENERGY | 2019年 / 43卷 / 01期

关键词：

Heat transfer; friction factor; THPP; discrete V-shaped perforated baffles; CFD; FRICTION FACTOR CORRELATIONS; THERMOHYDRAULIC PERFORMANCE; TRANSFER ENHANCEMENT; RECTANGULAR DUCT; ARTIFICIAL ROUGHNESS; TRANSVERSE RIBS; GAP; PARALLEL; BROKEN; FINS;

D O I：

10.1080/01430750.2019.1636874

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：

In the present work, thermal performance of solar air heater (SAH) having discrete V-shaped perforated baffles as artificial roughness on absorber surface has been numerically investigated. The effect of relative blockage height (e/H) of proposed roughness on Nusselt number (Nu), friction factor (f) and thermohydraulic performance parameter (THPP) has been considered. Parametric investigation covers a range of roughness parameter viz. relative blockage height (e/H) from 0.3 to 0.6 and flow parameter, Reynolds number (Re) from 4000 to 18,000 at constant open area ratio of 23%, relative pitch ratio of 6 and angle of attack of 60 degrees. Performance of SAH with proposed roughness has been compared with other roughness geometries investigated by other researchers. It is noticed that Nusselt number enhancement ratio (Nu(rat)) and friction factor enhancement ratio (f(rat)) are 4.24 and 14.73, respectively, and maximum values of THPP is found to be 2.24 at e/H = 0.4.

引用

页码：243 / 251

页数：9

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