Numerical Analysis Of Turbulent Flow And Conjugate Heat Transfer Characteristics In Channel Provided With Internal Waved Fins And Baffles: Effect Of Pitch Of Waved Fins And Baffles
2010
Autre
Sciences Et Technologie

Université Belhadj Bouchaib - Ain Témouchent

D
Dr Benzenine Hamidou , Dr Saim Rachid , Dr Benyoucef Boumédiène , Dr Abboudi Said , Dr Imine Omar

Résumé: The current numerical study is conducted to present a computational analysis on the turbulent flow of air and conjugate heat transfer in a pipe of rectangular section provided with waved fins which are arranged on the bottom and top channel walls in a periodically staggered way (figure 1). To this end we solved numerically, by the finite volumes method, the conservation equations of mass, momentum and energy. The model was adopted for the taking into account of turbulence. The velocity and pressure terms of momentum equations are solved by the SIMPLE algorithm. The parameters studied include the entrance mass flow rate of air. The effect of the waved fins and its location in the channel on heat transfer was studied in detail for three different Reynolds numbers in the range (5000-20000) and for three distance between waved fins D=s/2, D=s, and D=3s/2. The axial velocity profiles, the structures represented by the convective Nusselt number, friction coefficient were obtained for selected sections, namely, upstream, downstream and between the two waved fins for different Reynolds number. The results show that the flow and the heat transfer characteristics are strongly dependent on mass-flow rate of air and the presence and/or the absence of the waved fins in the pipe. It was observed that increasing the Reynolds number will increase the efficiency of the heat transfer and the thermal performance.

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