Laminar Flow and Heat Transfer Characteristics in Jackets of Triangular Flow Channels

doi:10.1016/S1004-9541(13)60631-X

Chin.J.Chem.Eng. ›› 2013, Vol. 21 ›› Issue (11): 1224-1231.DOI: 10.1016/S1004-9541(13)60631-X

• FLUID DYNAMICS AND TRANSPORT PHENOMENA • Previous Articles Next Articles

Laminar Flow and Heat Transfer Characteristics in Jackets of Triangular Flow Channels

WANG Cuihua^1,2, LIU Shengju², WU Jianhua¹, LI Yaxia²

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

Received:2012-08-27 Revised:2012-12-19 Online:2013-11-26 Published:2013-11-28
Contact: WU Jianhua
Supported by:
Supported by the Special Program for Local Universities Development of Central Finance of China (2050205), the National Natural Science Foundation of China (21106086), and the Program for Liaoning Excellent Talents in University (LJQ2012035).

Laminar Flow and Heat Transfer Characteristics in Jackets of Triangular Flow Channels

王翠华^1,2, 刘胜举², 吴剑华¹, 李雅侠²

1 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2 School of Energy and Power Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China

通讯作者: WU Jianhua
基金资助:
Supported by the Special Program for Local Universities Development of Central Finance of China (2050205), the National Natural Science Foundation of China (21106086), and the Program for Liaoning Excellent Talents in University (LJQ2012035).

Abstract

Abstract: Laminar flow and heat transfer characteristics of jacketed vessel with triangular flow channels were numerically studied under hydrodynamically and thermally fully developed conditions. Constant heat flux at the heated wall was assumed. The numerical program code in terms of vorticity, stream function, axial velocity component and energy equations was written based on a finite volume method. Based on the numerical results, the flow and temperature field were given, and the effects of Dean and Prandtl numbers on flow and heat transfer were examined, and the correlations of flow resistance and mean Nusselt number were developed for the jacket. The results show that the structure of secondary flow is steady two vortices in the investigated range of dimensionless curvature ratio and Reynolds number. Two peaks of local Nusselt number increase significantly with Prandtl and Dean number increasing, but the local Nusselt numbers near two ends and at the center of the heated wall increase only slightly. The center and two ends of heated wall are the poor positions for heat transfer in the jacket. Compared with the outer half coil jacket at the same area of heated wall, curvature radius, Reynolds number and Prandtl number, the jacket of triangular flow channel has lower flow resistance and less mean Nusselt number.

Key words: jacketed vessel, triangular flow channel, secondary flow, heat transfer enhancement

摘要： Laminar flow and heat transfer characteristics of jacketed vessel with triangular flow channels were numerically studied under hydrodynamically and thermally fully developed conditions. Constant heat flux at the heated wall was assumed. The numerical program code in terms of vorticity, stream function, axial velocity component and energy equations was written based on a finite volume method. Based on the numerical results, the flow and temperature field were given, and the effects of Dean and Prandtl numbers on flow and heat transfer were examined, and the correlations of flow resistance and mean Nusselt number were developed for the jacket. The results show that the structure of secondary flow is steady two vortices in the investigated range of dimensionless curvature ratio and Reynolds number. Two peaks of local Nusselt number increase significantly with Prandtl and Dean number increasing, but the local Nusselt numbers near two ends and at the center of the heated wall increase only slightly. The center and two ends of heated wall are the poor positions for heat transfer in the jacket. Compared with the outer half coil jacket at the same area of heated wall, curvature radius, Reynolds number and Prandtl number, the jacket of triangular flow channel has lower flow resistance and less mean Nusselt number.

关键词: jacketed vessel, triangular flow channel, secondary flow, heat transfer enhancement

WANG Cuihua, LIU Shengju, WU Jianhua, LI Yaxia. Laminar Flow and Heat Transfer Characteristics in Jackets of Triangular Flow Channels[J]. Chin.J.Chem.Eng., 2013, 21(11): 1224-1231.

王翠华, 刘胜举, 吴剑华, 李雅侠. Laminar Flow and Heat Transfer Characteristics in Jackets of Triangular Flow Channels[J]. Chinese Journal of Chemical Engineering, 2013, 21(11): 1224-1231.

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Laminar Flow and Heat Transfer Characteristics in Jackets of Triangular Flow Channels

Laminar Flow and Heat Transfer Characteristics in Jackets of Triangular Flow Channels

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