Numerical Flow and Heat Transfer in a Channel with Various Shaped Ribs

M. Kanoun(1*), M. Baccar(2), M. Mseddi(3)

(1) Computational Fluid Dynamics and Transfer Phenomena research unit (C.F.D.T.P.), National School of Engineering of Sfax (ENIS), University of Sfax, Tunisia
(2) Computational Fluid Dynamics and Transfer Phenomena research unit (C.F.D.T.P.), National School of Engineering of Sfax (ENIS), University of Sfax, Tunisia
(3) Computational Fluid Dynamics and Transfer Phenomena research unit (C.F.D.T.P.), National School of Engineering of Sfax (ENIS), University of Sfax, Tunisia
(*) Corresponding author


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Abstract


Abstract – A numerical investigation of convective heat transfer between a fluid and some physical obstacles (ribs) mounted on the lower wall (12 ribs) and on the upper wall (13 ribs) of a channel was conducted. This technique is used in the internal cooling of turbine blades. The governing equations have been solved in a two-dimensional domain using a control volume method and the SIMPLE algorithm for the velocity-pressure coupling is employed. Computation was made for three shaped ribs, rectangular, triangular and semicircular cross-sections. The flow Reynolds number for this numerical study is varied between 200 and 1000 and the Prandtl number is equal to 0.71. The rib height-to-channel hydraulic diameter, width-to channel hydraulic diameter and pitch-to-height ratio are fixed at h=0.214, w=0.74 and p=10, respectively. The grid is non uniform and is highly concentrated close to the rib to capture high gradient velocity, pressure and temperature. A uniform temperature through the ribs and all walls was assumed. We have determined distributions of velocity, friction factor, temperature and Nusselt number according to the shaped ribs and Reynolds numbers
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Keywords


Forced Convection; Heat Transfer Enhancement; Grooved Channel; Finite Volume Method; Shaped Ribs

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