ARTICLE:

• Heat Transfer Characteristics in Impinging Jet Arrays  download article

A. J. C. King
Department of Mechanical Engineering, Curtin University of Technology, Perth, Australia

T. T. Chandratilleke
Department of Mechanical Engineering, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia

ABSTRACT

Impinging jets have often been highlighted as suitable for use in high heat flux micro heat exchangers. For cases where high heat fluxes are present over large areas, arrays of impinging jets are often used. In this paper the array geometry to provide maximum heat transfer is determined by a parametric study on impinging jets arranged in both square and hexagonal arrays. Closely packed jet arrays are numerically modelled for a range of jet to surface distances, jet-to-jet spacings and jet velocities and the optimum configuration determined by comparison of the average surface Nusselt number. Results indicate average heat transfer increases as spacing between jets decreases up to a critical distance at which heat transfer is significantly reduced. The flow characteristics affecting this critical distance are examined.

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