Abstract
ABSTRACTA stainless steel vertical surface of 0.25 mm thickness at 800 ± 10° C initial temperature was quenched by jet impingement technique. The rewetting phenomenon of the surface was investigated for the jet of 2.5 – 4.8 mm diameter and jet Reynolds number of 5000–24000. The observations are made from the stagnation point to the 24 mm downstream spatial locations, for both upside and downside directions. The quenching performance of the test surface was evaluated on the basis of different rewetting parameters i.e. rewetting temperature, wetting delay, and rewetting velocity. It has been observed that with the rise in jet Reynolds number and jet diameter, the surface rewetting performance increases. A correlation has also been proposed to determine the dimensionless rewetting velocity that predicts the experimental data within an error band of ±20 percent.
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