Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets

›› 2011, Vol. 19 ›› Issue (2): 253-261.

• FLUID FLOW AND TRANSPORT PHENOMENA • Previous Articles Next Articles

Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets

LI Yaxia^1,2, WU Jianhua¹, ZHAN Hongren², WANG Cuihua¹

1. School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China;
2. School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Received:2010-08-25 Revised:2010-11-16 Online:2011-04-28 Published:2011-04-28
Supported by:
Supported by the National Key Technologies Research and Development Program during the 10th Five-year Plan Period(2004BA319B1);the Educational Commission of Liaoning Province of China(2008S117)

Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets

李雅侠^1,2, 吴剑华¹, 战洪仁², 王翠华¹

1. School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China;
2. School of Mechanical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

通讯作者: WU Jianhua,E-mail:Jianhuawu@163.com
基金资助:
Supported by the National Key Technologies Research and Development Program during the 10th Five-year Plan Period(2004BA319B1);the Educational Commission of Liaoning Province of China(2008S117)

Abstract

Abstract: The physical models of the outer and inner half coil jackets were simplified to two types of coiled ducts.The mathematic models of incompressible fluid at the condition of laminar flow and heat transfer in the two types of jackets for cooling process reactor were set up and solved by the semi-implicit method for pressure linked equations consistent (SIMPLEC) algorithm based on a control volume method.The flow and temperature fields were given and the effects of Dean and Prandtl numbers on flow and heat transfer were studied.The results show that flow in the inner half coil jacket is found to exhibit transition of secondary flow pattern from two vortices to four vortices when the Dean number increases,but that in the outer half coil jacket is not found.The critical Dean number is about 96.The inner half coil jacket has stronger heat transfer ability than the outer half coil jacket and this superiority is more evident with larger Prandtl number.However,as the Dean number is greater than 105,the flow resistance enhances more severely in the inner jacket than the outer jacket.For both jackets,the centers of the heated wall are the poorest for heat transfer.

Key words: half coil jacket, secondary flow, temperature field, heat transfer enhancement

摘要： The physical models of the outer and inner half coil jackets were simplified to two types of coiled ducts.The mathematic models of incompressible fluid at the condition of laminar flow and heat transfer in the two types of jackets for cooling process reactor were set up and solved by the semi-implicit method for pressure linked equations consistent (SIMPLEC) algorithm based on a control volume method.The flow and temperature fields were given and the effects of Dean and Prandtl numbers on flow and heat transfer were studied.The results show that flow in the inner half coil jacket is found to exhibit transition of secondary flow pattern from two vortices to four vortices when the Dean number increases,but that in the outer half coil jacket is not found.The critical Dean number is about 96.The inner half coil jacket has stronger heat transfer ability than the outer half coil jacket and this superiority is more evident with larger Prandtl number.However,as the Dean number is greater than 105,the flow resistance enhances more severely in the inner jacket than the outer jacket.For both jackets,the centers of the heated wall are the poorest for heat transfer.

关键词: half coil jacket, secondary flow, temperature field, heat transfer enhancement

LI Yaxia, WU Jianhua, ZHAN Hongren, WANG Cuihua. Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets[J]. , 2011, 19(2): 253-261.

李雅侠, 吴剑华, 战洪仁, 王翠华. Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets[J]. , 2011, 19(2): 253-261.

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Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets

Fluid Flow and Heat Transfer Characteristic of Outer and Inner Half Coil Jackets

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