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HEAT TRANSFER ENHANCEMENT IN LAMINAR FLOW BY A PROTRUSION IN A RECTANGULAR CHANNEL

DOI: 10.1615/ICHMT.2008.CHT.2380
17 pages

Osama N. Alshroof
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Australia

John Reizes
School of Mechanical and Manufacturing Engineering, UNSW-Sydney, Sydney 2052, Australia

Abstract

A numerical investigation has been performed to determine the effect on heat transfer in the laminar regime of introducing a single protrusion in a rectangular channel. The geometry consists of a three dimensional channel 10 mm high, 40 mm wide and 290 mm long in which a spherical protrusion was placed 90 mm from the inlet on the centreline of one of the wide sides. The print diameter of the obstacle was equal to the height of the channel and it protruded 2.2 mm above the surfaces. In order to properly take into account developing flow, a 30 mm region was introduced upstream of the inlet. Adiabatic wall with zero shear stress boundary conditions were used on all four walls of this region and uniform velocity and temperature distributions were assumed at the inlet of the calculation region. The two wide plates of the channel and the protrusion were set to 45°C and the other two sides adiabatic. The fluid was assumed to be silicon oil with an inlet velocity of 1 ms−1 at a temperature of 20°C, yielding a Reynolds number of 1600 based on the hydraulic diameter of the channel. A commercial code, ANSYS-CFX11.0 was used for all simulations. The resultant very complex flow and thermal fields in the channel are discussed in detail. The presence of the protrusion results in an enhancement in the total heat transfer rate of 7% above that of a channel lined with flat plates only. This is a worthwhile increase since it is brought about by a pressure increase of only 1%.

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