Augmentation of Heat Transfer in a Circular Channel with Inline and Staggered Baffles

被引：6

作者：

Al Nuwairan, Muneerah ^{[1
]}

Souayeh, Basma ^{[2
,3
]}

机构：

[1] King Faisal Univ, Coll Sci, Dept Math & Stat, POB 400, Al Hasa 31982, Saudi Arabia

[2] King Faisal Univ, Coll Sci, Dept Phys, POB 400, Al Hasa 31982, Saudi Arabia

[3] Univ Tunis El Manar, Fac Sci Tunis, Phys Dept, Lab Fluid Mech, Tunis 2092, Tunisia

来源：

ENERGIES | 2021年 / 14卷 / 24期

关键词：

heat transfer; CFD; baffles; staggered; j-factor; thermal performance factor; SOLAR AIR HEATER; TRANSFER ENHANCEMENT; FLOW; DUCT; PERFORMANCE; INSERT; TUBE; RIBS;

D O I：

10.3390/en14248593

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：

This numerical investigation presents the effects of the position of baffles in the shape of a circle's segment placed inside a circular channel to improve the thermal and flow performance of a solar air heater. Three different baffles' positions with Reynolds number varying between 10,000 to 50,000 were investigated computationally. The k-omega SST model was used for solving the governing equations. Air was taken as the working fluid. Three pitch ratios (Y = 3, 4, and 5) were considered, while the height of the baffles remained fixed. The result showed an enhancement in Nusselt number, friction factor, j-factor, and thermal performance factor. Staggered exit-length baffles showed maximum enhancement in heat transfer and pressure drop, while inline inlet-length baffles showed the least enhancement. For a pitch ratio of Y = 3.0, the enhancement in all parameters was the highest, while for Y = 5.0, the enhancement in all parameters was the least. The highest thermal performance factor of 1.6 was found for SEL at Y = 3.0.

引用

页数：20

共 43 条

[1] An experimental investigation of performance of a double pass solar air heater with foam aluminum thermal storage medium [J].