Received: 28 September 2017 Accepted: 19 July 2018 Inclined jet impingement is used for various industrial cooling applications. Its manufacturing and ease of applications is making it more popular day by day. The hot flat target surface is cooled using jet impingement. The jet is kept at an inclination of 15 –75° to hot target plate. The experiments are performed to study cooling effect with different configurations of inclined jets. Inclined jet with air as fluid having Reynolds number in the range of 2,000 ⩽ Re ⩽ 20,000 is examined for the circular cross section of jet. The target surface to jet perpendicular height (H) is taken as 0.5 ⩽ H/D ⩽ 6.8. The maximum cooled spots on the target surface are identified on the plate by analyzing maximum Nusselt numbers at different locations. The effect of H and (H/D) on maximum Nusselt number is presented. The investigation leads to equations for maximum Nusselt number for inclined circular non-confined air jet in terms of Reynolds number. Also analysis is carried out for ratio of average Nusselt number to maximum Nusselt number.

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Investigation of maximum Nusselt number with inclined and non-confined offset jet impingement cooling

Electronics cooling has wide area of research and have been experimented with different techniques. Present paper deals with multiple jet cooling experiments on heated target. These can be applicable for high heat dissipating objects or targets from power electronics or electrical section. Two type of jet plates are used viz. four jets in a plate and nine jets in a plate. The specified target is hot surface cooled by convective heat transfer by using jets, which is impinged using air as working fluid. Pitch indicating distance between two adjacent jets is varying from 15mm to 30 mm gradually for both the types of jet plates. All experiments are performed at Reynolds Number of 2000. The target to jet height is also varied from 4mm to 16mm. The higher number of jets with 16mm pitch indicates better cooling performance and is annualized by Nusselt number which is measure of cooing performance.

S. B. Ingole

Papers

Heat transfer analysis for multiple jet cooling of high temperature electronics target