The Effectiveness of Secondary Flow Produced by Vortex Generators Mounted on Both Surfaces of the Fin to Enhance Heat Transfer in a Flat Tube Bank Fin Heat ExchangerSource: Journal of Heat Transfer:;2013:;volume( 135 ):;issue: 004::page 41902DOI: 10.1115/1.4023037Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Secondary flow is the flow in the cross section normal to the main flow. It plays an important role on the enhanced heat transfer and in the applications in other fields. Secondary flow can greatly enhance the convective heat transfer. In order to find the effectiveness of secondary flow for heat transfer enhancement, a nondimensional parameter, Se, based on the absolute vorticity flux is reported to specify the intensity of secondary flow. Its physical meaning is the ratio of inertial force to viscous force induced by secondary flow. As an example, the effectiveness of secondary flow was numerically studied for a flat tube bank fin heat exchanger with vortex generators (VGs) mounted on both surfaces of the fin. The contributions of VGs are investigated for the enhancements of secondary flow intensity, convective heat transfer, and pressure drop. The method is demonstrated using Se to find out the optimum configurations of VGs. The results reveal that close relationships exist not only between the spanaverage nondimensional intensity of secondary flow and the spanaverage Nusselt number but also between the volume average nondimensional intensity of secondary flow and the overall average Nusselt number. For the configuration studied, a ratio of Nusselt number enhancement to the friction factor enhancement increases with increasing the enhancement of secondary flow intensity. As a supplement to traditional criteria on a good performance heat transfer surface, the nondimensional intensity of secondary flow can be used clearly for an optimum value of VG parameter.
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contributor author | Song, Ke | |
contributor author | Wang, Liang | |
date accessioned | 2017-05-09T00:59:41Z | |
date available | 2017-05-09T00:59:41Z | |
date issued | 2013 | |
identifier issn | 0022-1481 | |
identifier other | ht_135_4_041902.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/152098 | |
description abstract | Secondary flow is the flow in the cross section normal to the main flow. It plays an important role on the enhanced heat transfer and in the applications in other fields. Secondary flow can greatly enhance the convective heat transfer. In order to find the effectiveness of secondary flow for heat transfer enhancement, a nondimensional parameter, Se, based on the absolute vorticity flux is reported to specify the intensity of secondary flow. Its physical meaning is the ratio of inertial force to viscous force induced by secondary flow. As an example, the effectiveness of secondary flow was numerically studied for a flat tube bank fin heat exchanger with vortex generators (VGs) mounted on both surfaces of the fin. The contributions of VGs are investigated for the enhancements of secondary flow intensity, convective heat transfer, and pressure drop. The method is demonstrated using Se to find out the optimum configurations of VGs. The results reveal that close relationships exist not only between the spanaverage nondimensional intensity of secondary flow and the spanaverage Nusselt number but also between the volume average nondimensional intensity of secondary flow and the overall average Nusselt number. For the configuration studied, a ratio of Nusselt number enhancement to the friction factor enhancement increases with increasing the enhancement of secondary flow intensity. As a supplement to traditional criteria on a good performance heat transfer surface, the nondimensional intensity of secondary flow can be used clearly for an optimum value of VG parameter. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | The Effectiveness of Secondary Flow Produced by Vortex Generators Mounted on Both Surfaces of the Fin to Enhance Heat Transfer in a Flat Tube Bank Fin Heat Exchanger | |
type | Journal Paper | |
journal volume | 135 | |
journal issue | 4 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4023037 | |
journal fristpage | 41902 | |
journal lastpage | 41902 | |
identifier eissn | 1528-8943 | |
tree | Journal of Heat Transfer:;2013:;volume( 135 ):;issue: 004 | |
contenttype | Fulltext |