Investigation of Heat Transfer Enhancement by Impinging Air Jets

Niranjan Murthy, Raman Singh, Sujay B.J

Multiple air jet cooling, Heat transfer enhancement, Effect of jet nozzle position

The electronic equipments have become a subject of distinct interest in current years due to the increasing capacity and fast decreasing size of electronic components. Direct contact cooling using multiple jet impingement 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. 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 show significant increase in heat transfer co-efficient with increase in heat flux. Jet Reynolds number plays an important role.