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An experimental study has been conducted to understand characteristics of transient heat transfer during quenching a hot cylindrical block with an impinging water jet. The experiment was done at atmospheric pressure for the following condition : an initial block temperature of 250 and 400°C, a subcooling of 20-80 K, a jet velocity of 3-15 m/s, and a nozzle diameter of 2 mm. The surface temperature and heat flux are estimated by applying two-dimensional inverse solution to the measured temperatures in the block during the quench. The surface heat flux is greatly influenced by the position of the wetting front. It reveals that the maximum heat flux appears slightly far from the wetting front and its value decreases with a distance from the jet. The experiment shows that the maximum heat flux in the quecnching is smaller than the critical heat flux (CHF) in the corresponding steady condition depending on a cooling situation, but the trend is similar between the maximum heat flux and the CHF. An equation is proposed to predict the maximum heat flux on a basis of the CHF correlation.

Quenching of High Temperature Cylindrical Surface with an Impinging Jet (Maximum Heat Flux)