The heat transfer performance of two microjet arrays was investigated using degassed deionized water and air. The inline jet arrays had diameters of 54 μm and 112 μm⁠, a spacing of 250 μm⁠, a standoff of 200 μm (⁠S/d=2.2 and 4.6, H/d=1.8 and 3.7), and jet-to-heater area ratios from 0.036 to 0.16. Average heat transfer coefficients with deionized water were obtained for 150≤Red≤3300 and ranged from 80,000 W/m2 K to 414,000 W/m2 K⁠. A heat flux of 1110 W/cm2 was attained with 23°C inlet water and an average surface temperature of 50°C⁠. The Reynolds number range for the same arrays with air was 300≤Red≤4900 with average heat transfer coefficients of 2500 W/m2 K to 15,000 W/m2 K⁠. The effect of the Mach number on the area-averaged Nusselt number was found to be negligible. The data were compared with available correlations for submerged jet array heat transfer.

Issue Section:
Research Papers
Keywords:
heat transfer, jets, Mach number, microfluidics, electronics cooling, microscale jet heat transfer, microjet, microjet array
Topics:
Heat transfer, Heat transfer coefficients, Reynolds number, Temperature, Water, Mach number, Heat losses, Flow (Dynamics), Jets
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