No abstract

This paper attempts to determine how the cooling effect of copper alloy B14 varies with roughness, type of water and type of nozzle. Several experiments were performed on 5mmthick copper alloy B14 plates with different combinations of the said parameters. The plates with smooth and rough surfaces were heated up to the 520 ℃. Either tap or distilled water was used as coolant with constant volumetric flow rate, 1.2 L/min. Two types of nozzle were tested, namely, spray nozzle (460.404) and full jet nozzle (544.400). The results of the cooling rate were analyzed on the 1D model. It is observed that distilled water led to a slightly faster cooling rate than tap water, due to oxidation on the copper alloy; rough surface caused fast heat transfer compared to the smooth surface; the domination of nucleate boiling regime was observed in the case of full jet nozzle, as compared to the case of to the spray nozzle, because the full jet nozzle can prevent vapor formation on the material; the spray nozzle covered a larger wetting front area than the full jet nozzle. The results were verified through experiments on the two types of nozzles.