Abstract
The flow and heat transfer characteristics of different surface texture pin fins were experimentally investigated. The pin fin outer surface texture has been modified to different threaded surface texture (i.e., Metric, Worm, ACME, Buttress, Sharp V, Whitworth and square thread) without changing cross-sectional areas. The Reynolds number based on hydraulic diameter was varied from 2500 to 4500. This study reveals that threaded surface pin heat sink is 18.13% higher heat transfer than plain pin heat sink. In terms of specific performance consideration, threaded surface textures pin fins shows impending substitute design to plain circular pin fins. The threaded surface texture pin has decreased aerodynamic consequence compared to plain circular pin. The pressure drop across heat sink is 21.4% lesser in plain pin heat sink than screw surface pin heat sink. The thermal resistance difference between experimental and CFD analysis is 4.08%. The threaded texture increases surface area, flow turbidity and delays flow separation and these factors enhances the heat transfer.
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