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Laminar flow and Heat Transfer Characteristics in Jackets of triangular flow channels

Chinese Journal of Chemical Engineering 2013年第11期21卷 1224-1231页

作者：王翠华刘胜举吴剑华李雅侠 School Of Chemical Engineering and Technology Tianjin University Tianjin 300072 China School of Energy and Power Engineering Shenyang University of Chemical Technology Shenyang 110142 China

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 theheated wall was assumed. The numerical program code interms of vorticity, stream function, axial velocity com ponent 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 ex amined, 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 curvatureratio and Reynolds number. Two peaks of local Nusselt number increase significantly with Prandtl and Dean num ber 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, e jacket of triangular flow chmnel has lower flow resistance and less mean Nusselt number.

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

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