3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles
碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === A series of 3-D computational fluid dynamics analyses along with the simplified conjugate-gradient method were carried out to study the thermal-hydraulic characteristics for the louver-finned heat exchanger. The effects of different louver angles (θ = 20o to...
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ndltd-TW-101NCKU54900732016-03-18T04:42:17Z http://ndltd.ncl.edu.tw/handle/87434543481350229340 3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles 高效率變角度百葉窗型鰭片之三維熱液動分析 Bing-ZeLi 李秉澤 碩士 國立成功大學 機械工程學系碩博士班 101 A series of 3-D computational fluid dynamics analyses along with the simplified conjugate-gradient method were carried out to study the thermal-hydraulic characteristics for the louver-finned heat exchanger. The effects of different louver angles (θ = 20o to 28o), louver pitches (Lp = 0.8 to 1.2 mm) and angles of attack (Δθ = 0o ~ 3 o) on the heat transfer phenomenon and pressure drop (in terms of Colburn j factor and friction f factor) were investigated in detail. The optimization of the louver angle and louver pitch is carried out by using the simplified conjugate-gradient method. The area reduction ratio using a louver fin relative to the plain surface is the objective function to be maximized. The numerical results showed that both the f and j factors are increased with the increase of the louver angle; for a given louver angle, increasing the louver pitch (Lp), from 0.8 to 1.2mm, the f and j factors are increased by 2.33% and 4.20%, respectively. The results of optimization analysis revealed that, with inlet frontal velocity ranging from 2 to 10m/s, the optimal values of louver angle and louver pitch are in the range of (22.3o to 33.6o ) and (0.84 to 1.02 mm), respectively. It is also found that, under the optimum conditions, the area reduction ratio could reach up to 28 % to 37%. It was also found that, as the angle of attack increases, both the f and j factors are increased. In addition, the area reduction ratio could be reached to 21.90% approximately. Finally, the software for computer-aided heat exchanger design was programmed in Visual Basic software, according to the theory of heat exchanger. It can simplify the calculating process and make engineers get the reliable result easily. Jiin-Yuh Jang 張錦裕 2013 學位論文 ; thesis 119 zh-TW |
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碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === A series of 3-D computational fluid dynamics analyses along with the simplified conjugate-gradient method were carried out to study the thermal-hydraulic characteristics for the louver-finned heat exchanger. The effects of different louver angles (θ = 20o to 28o), louver pitches (Lp = 0.8 to 1.2 mm) and angles of attack (Δθ = 0o ~ 3 o) on the heat transfer phenomenon and pressure drop (in terms of Colburn j factor and friction f factor) were investigated in detail. The optimization of the louver angle and louver pitch is carried out by using the simplified conjugate-gradient method. The area reduction ratio using a louver fin relative to the plain surface is the objective function to be maximized.
The numerical results showed that both the f and j factors are increased with the increase of the louver angle; for a given louver angle, increasing the louver pitch (Lp), from 0.8 to 1.2mm, the f and j factors are increased by 2.33% and 4.20%, respectively. The results of optimization analysis revealed that, with inlet frontal velocity ranging from 2 to 10m/s, the optimal values of louver angle and louver pitch are in the range of (22.3o to 33.6o ) and (0.84 to 1.02 mm), respectively. It is also found that, under the optimum conditions, the area reduction ratio could reach up to 28 % to 37%.
It was also found that, as the angle of attack increases, both the f and j factors are increased. In addition, the area reduction ratio could be reached to 21.90% approximately. Finally, the software for computer-aided heat exchanger design was programmed in Visual Basic software, according to the theory of heat exchanger. It can simplify the calculating process and make engineers get the reliable result easily.
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author2 |
Jiin-Yuh Jang |
author_facet |
Jiin-Yuh Jang Bing-ZeLi 李秉澤 |
author |
Bing-ZeLi 李秉澤 |
spellingShingle |
Bing-ZeLi 李秉澤 3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles |
author_sort |
Bing-ZeLi |
title |
3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles |
title_short |
3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles |
title_full |
3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles |
title_fullStr |
3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles |
title_full_unstemmed |
3-D Thermal-Hydraulic Analysis of High Performance Louver-finned Heat Exchanger with Variable Angles |
title_sort |
3-d thermal-hydraulic analysis of high performance louver-finned heat exchanger with variable angles |
publishDate |
2013 |
url |
http://ndltd.ncl.edu.tw/handle/87434543481350229340 |
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