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R. Cruces-Reséndez
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Proceedings Papers
HT 2021, Heat Treat 2021: Proceedings from the 31st Heat Treating Society Conference and Exposition, 293-301, September 14–16, 2021,
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The transient behavior of boiling phenomena during quenching of an AISI 304 stainless steel, conical-end, cylindrical probe in flowing water at 60 °C was studied. Two free-stream velocities (0.2 and 0.6 m/s) and two initial probe temperatures (850 and 950 °C) were investigated. From high-speed video recordings, undulations of the liquid vapor interface that appear periodically and propagate in the direction of the flow stream were observed during the vapor film stage. After the collapse of the vapor film, a wetting front is formed which consists of many small bubbles that coalesce rapidly in a small area while fewer and larger bubbles nucleate and grow below it. The initial temperature has a marginal effect on the size and half-life of the large bubbles. However, the water flow rate produces larger values of maximum diameter and half-life time for water flowing at 0.2 m/s than their equivalents for 0.6 m/s.
Proceedings Papers
HT2017, Heat Treat 2017: Proceedings from the 29th Heat Treating Society Conference and Exposition, 436-443, October 24–26, 2017,
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The effect of probe geometry on the re-wetting behavior and heat extraction of cylindrical probes during forced convective quenching in laboratory-scale equipment was studied. Flat-end and hemispherical-end cylindrical probes made of AISI 304 stainless steel and instrumented with type-K thermocouples were considered. Two free-stream velocities (0.2 and 0.6 m/s) and two initial probe temperatures (850 and 950°C) were studied. The quench medium was water at 60°C. The inverse boiling curves and videos obtained showed that the vapor film stage lasts longer when using flat-end probes. This delay in the start of re-wetting shifted the cooling curves to the right and favored the probe surface to reach lower temperatures before the start of re-wetting which resulted in slightly higher values of the wetting front velocity. It is shown that the hydrodynamics of the flow around the probe end is responsible for the differences observed between the two geometries.