Experimental Investigation of Disrtribution of Coefficient of Static Pressure on the Concave Curved Surface Due to Impingement of Air Jet from an Orifice for Confined Flow: Investigating the Distribution of Static Pressure on a Concave Curved Surface Due to Jet Impingement Cooling

Abstract

The jet impingement cooling have better mobility and effectiveness, because of this it has been broadly used in thermal or thermal related industrial systems. Jet impingement is one of the well defined techniques for cooling, heating of a surface. Such impingement flow allows small flow path on the surface with relative high heat transfer rate. Since local heat transfer coefficients depends on flow characteristics such as static pressure distribution. The present work is to study experimentally the distribution of static pressure on the concave curved surface due to air jet impingement from an orifice for confined flow. The experimental includes measurement of static pressure difference on concave curved surface for various parameters such as d=16mm (diameter of orifice), Z/d=1to 4(non dimensional distance between orifice exit plane and curved surface plane) θ=00 to 400 (circumferential location indicated as angular position on concave curved surface measured from the direction of jet impingement at the centre of curvature) for Reynolds number of flow 5000 to 45000. It is observed that coefficient of static pressure Cp is independent of Reynolds number.The results revels that higher value of CP are observed up to θ=00 and decreases along the circumferential location .Higher values of Cp are observed at lower Z/d ratio as the velocity decay is minimum at this position.