This paper presents results of an experimental investigation of single and two-phase impinging heat transfer using water as the working fluid. The objective of this experiment was to study effects of parameters such as jet width, impinging plane orientation and different values of heat fluxes. Here, four impinged surface orientations were adopted: downward, upward, side and 45 deg declined directions. The flow rate in the normally impinging jet system was fixed at 18.2 ml/min. A range of jet widths was selected: 0.05 mm, 0.2 mm, 0.6 mm 1.0 mm and 2.0 mm. The target plate, which has thermal performance similar to that of a real silicon chip, was supplied with heat flux ranging from 5 to 80 W/cm~(2). The surface temperature of the target plate was raised up to the boiling point to cover single and two-phase regimes. Furthermore, visualization of single and two-phase heat transfer was obtained to explain the heat transfer results obtained.
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