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EFFECT OF WIDTH OF A VERTICAL PARALLEL PLATE CHANNEL ON THE TRANSITION OF THE DEVELOPING THERMAL BOUNDARY LAYER

DOI: 10.1615/ICHMT.2012.CHT-12.160
pages 265-278

Ali S. Alzwayi
Systems, Power & Energy Research Division, School of Engineering, University of Glasgow,Glasgow, G12 8QQ, UK

Manosh C. Paul
Systems, Power & Energy Research Division, School of Engineering, University of Glasgow, Glasgow, G12 8QQ, UK

Abstract

Numerical simulations were performed to study the transition of the development of the thermal boundary layer of air along an isothermal heated plate in a large channel which is bounded by an adiabatic plate. In particular, the aim is to investigate the effects of the channel width, b, on the transition of the flow under various ambient air and plate temperatures. Three different RANS based turbulent k−ε models, namely standard, RNG and Realizable with an enhanced wall function were employed in the simulations. The channel width was varied from 0.04 m to 0.45 m and the numerical results of the maximum values of the flow velocity, turbulent kinetic energy were recorded along the vertical axis to examine the critical distance of the developing flow. The results show that the transition delays when the width is increased from 0.04 m to 0.08 m, and particularly, the critical distance at b = 0.08 m reaches its maximum with the Grashof number of 2.8 × 1010. However, when b is increased further from 0.08 m to 0.45 m, the critical distance drops, indicating an early transition of the flow. Comparisons of the selected numerical results are made with available experimental data of turbulent flow, and a satisfied agreement is received.

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