Effects of Aspect Ratio on Heat Transfer and Pressure Drop in Stationary and Rotating Two-Pass Rectangular Channels with Smooth Wall.

Document Type : Research Studies

Authors

1 Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University/., Mansoura., Egypt.

2 Professor of Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

3 Associate Professor., Mechanical Power Engineering Department., Faculty of Engineering., El-Mansoura University., Mansoura., Egypt.

Abstract

A computational study is performed on three-dimensional turbulent flow and heat transfer in a rotating and non-rotating two-pass smooth rectangular channel with aspect ratio (AR) of 2:1 and 1:2. The focus of this study is to investigate the effect of rotation, mean velocity of coolant fluid and the aspect ratio on the flow and heat transfer characteristics. A Reynolds-averaged Navier Stokes (RANS) turbulence model was employed to solve the NS-equations. Computations were performed with Reynolds number (Re) ranging from 19,000 to 25,000, rotation number (Ro) from 0 to 0.1, inlet coolant-to-wall density ratio (   p/p) was 0.39. The finite volume code, FLUENT ANSYS 6.3 was used to predict the flow and heat transfer. Computational domain was meshed with fine grids to resolve the near wall viscous layer using GAMBIT grid generator. Theoretical results obtained for stationary channels are in good agreement with experimental results of other investigators. Also, it is indicated that the aspect ratio, rotation number and fluid velocity has a great effect on the characteristics of flow, heat transfer and pressure drop in case of rotating two-pass rectangular channels. Moreover it is seen that there is a reversible fluid flow at higher rotation number. 

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