Impingement Heat Transfer with array of Multiple air Jets

Abstract

The use of impinging air jets in electronic thermal management is attracting some consideration due to their very high heat transfer coefficients. Direct contact cooling using multiple jet impingements is considered as the most effective method. The heat transfer problem is complex and better understanding of the jet impingement method is essential for proper application of this method for electronic cooling. In this investigation an experimental study of cooling capabilities of impinging air jet array is presented. Investigations were carried out using electrically heated test plate. Heat flux in the range of 25 to 200W/cm2, which is a typical requirement for cooling high power electronic components was dissipated using 0.25mm and 0.5mm diameter air jets arranged in 7X7 array with a pitch of 3mm. Tests were performed in the Reynolds number range of 1200 to 4500. Results shows higher values of heat transfer coefficient are obtained with the lower diameter jets.