Computational fluid dynamics simulations and experimental measurements ".c conducted to investigate the effect of the operating conditions of air-assisted water sprays on the heat transfer enhancement in the cooling of a cylindrical surface heated to temperatures near the nucleate boiling point. Experimental measurements are performed to investigate the effect of the droplet size, water flow rate, and liquid-to-air loading on the spray heat transfer along the circumference of the cylinder. A parallel study consisting of the modeling of the spray flow transportation process is also conducted based on the test setup conditions to support the interpretation of the test findings. Results show surface wetting of the cylinder and spray heat transfer to be strongly dependent on the spray operating conditions and the droplet size. The results of this study lead to a better understanding of the heat transfer enhancement of multiphase cooling applicable for certain heat exchangers.
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