Numerical Examination of Heat Transfer Augmentation between the Plates with Square Cross-Sectional Ribs for the Staggered Arrangement

Abstract

Heat transfer enhancement inside the ducts is significantly related with flow separation and flow reattachment regions. Therefore, ribs are used to trigger the rotational flows in the vicinity of the wall since the fluctuations in the thermal and hydrodynamic boundary layers are effective for the increment of heat transfer by convection. Even though heat transfer surface area is also enlarged by placing the ribs into the channels, the pressure loss due to the ribs has to be taken into account and controlled in these systems. Based on the aforementioned explanations, the square cross-sectional ribs have been mounted on the bottom and the top walls of horizontal parallel plates in terms of staggered arrangement. In the present paper, numerical analyses have been conducted via k-ω SST turbulence model at Re = 10000, 15000 and 20000 for different spacing values between two successive ribs. For the constant rib dimensions, the ribbed models have been compared among them by referring to smooth plates as reference model. For this reason; time-averaged results including streamwise velocity components, temperature distributions, pressure values, streamline patterns and Nusselt numbers for the ribbed and the smooth plates have been separately presented and compared.

Keywords

• CFD,Heat transfer,Nusselt number,Parallel plate,Reynolds number,Rib,Turbulent flow

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