A comprehensive parametric investigation of hemispherical cavities on thermal performance and flow-dynamics in the triangular-duct solar-assisted air-heater

被引：35

作者：

Goel, Varun ^{[1
]}

Kumar, Rajneesh ^{[2
]}

Bhattacharyya, Suvanjan ^{[3
]}

Tyagi, V. V. ^{[4
,5
]}

Abusorrah, Abdullah M. ^{[5
,6
]}

机构：

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

[2] Chandigarh Engn Coll Landran, Mech Engn Dept, Landran 140307, Punjab, India

[3] Birla Inst Technol & Sci Pilani, Dept Mech Engn, Pilani Campus, Vidya Vihar 333031, Rajasthan, India

[4] Shri Mata Vaishno Devi Univ, Sch Energy Management, Katra 182320, J&K, India

[5] King Abdulaziz Univ, Ctr Res Excellence Renewable Energy & Power Syst, Jeddah 21589, Saudi Arabia

[6] King Abdulaziz Univ, Fac Engn, Dept Elect & Comp Engn, Jeddah 21589, Saudi Arabia

来源：

RENEWABLE ENERGY | 2021年 / 173卷 / 173期

关键词：

Solar thermal; Dimple cavity; Vortex shedding; Performance; DIMPLED SURFACE; AUGMENTATION; ENHANCEMENT;

D O I：

10.1016/j.renene.2021.04.006

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The thermal energy available in the form of solar radiation is collected and converted into heat with the help of a solar air heater. The flow and thermal characteristics change significantly with the crosssectional shape of the flow passage. The effect of hemispherical dimple-cavities that were employed over the heat-collector plate has been analyzed based on the flow and heat characteristics of a triangular solar air heater. A comprehensive investigation of roughness and flow parameters is carried out experimentally, while the flow dynamics over the heat-collector plate are predicted using commercial software (ANSYS). The remarkable results are observed in terms of Nusselt number and friction factor with the use of dimples over the heat-collector plate in the solar air heater. The higher heat transfer is noticed at the training edge in comparison to the leading edge of the dimple. The best augmentation in Nusselt number obtained is of the order of 5.33 that is observed for transverse-pitch ratio, longitudinal-pitch ratio and relative dimple depth values of 11, 11 and 0.039 respectively, at Reynolds number value of 2160. A close fit curve was obtained between the values obtained from the developed correlation and experimental values with a maximum error of 6.61% and 7.03%, respectively. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页码：896 / 912

页数：17