WETTING SPEED DURING QUENCHING OF HOT SURFACE BY IMPINGING JET

WETTING SPEED DURING QUENCHING OF HOT SURFACE BY IMPINGING JET
Author(s):
Chitranjan
Keywords:
Jet Impingement, Wetting speed, Stagnation point, Surface quenching.
Abstract
Hot Stainless Steel (SS-304) horizontal surface of different initial temperatures are cooled by water jet of 33 ºC temperature and 3 mm diameter. The surface cooling performance is investigated with flow rate of 1.2 and 5.10 lpm. The test surface is of 150 mm long, 150 mm wide and 2 mm thickness. Surface is initially heated up to certain temperature in furnace and cooled by downward impinging jet. The process of surface cooling is recorded by a camera and the wetting speed over the hot surface is determined. The wetting speed on the hot surface is observed in the range of 2 – 35 mm/s for 10 mm – 40 mm spatial locations. It has been observed that the wetting speed increases with rise in flow rate and reduces for higher downstream spatial locations and surface initial temperature.
Article Details
Unique Paper ID: 145128 Publication Volume & Issue: Volume 4, Issue 7 Page(s): 429 - 432
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