Further Investigations of Heat TransferCharacteristics from Arrays of MultipleWater Jets

The use of impinging liquid jets in electronics thermal management is more attracting because of high heat transfer coefficients are achieved. In the present investigation an experimental study of the cooling capabilities of multiple water jet arrays were presented. For a square array of 49 jets of 0.25 and 0.5 mm diameter and a fixed jet spacing of 3mm were investigated. The arrays impinged on a test surface of 2X2 cm area. The tests were conducted for a flow rate range of 1300 to 2400ml/min for 0.5mm diameter jet and 800 to 1400 for 0.25mm diameter jet. The jet diameter of 0.25mm is found to be more effective causing higher values of heat transfer co-efficient, even with lower values flow rates. With jet diameter of 0.50mm, the effect of flow rate on the heat transfer co-efficient is reduced.