Abstract
A series of experiments was carried out to investigate the effects of water temperature on spray cooling heat flux. The specimen is made of 7075 aluminum alloy, and the spray is water. Water temperature Tw changes from 7.9 °C to 51.6 °C. Local water flux Mw shifts from 0.377 to 1.036 mg·s−1·mm−2. The one-dimensional (1D) inverse heat conduction model fails to reflect the distribution of heat flux in spray cooling heat transfer, whereas the two-dimensional (2D) model reveals the effect of local water flux Mw on the distribution of heat flux q. When nozzle height H is 4.3 cm, heat flux q is twice as great, whereas H is 12.3 cm. Hence, a larger local water flux Mw benefits the boiling heat transfer of the specimen. Whether H = 12.3 cm or H = 4.3 cm, heat flux q rises with increasing water temperature Tw when cooling surface temperature Ts is between 100 °C and 250 °C.
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