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Título del libro: 31st Asm Heat Treating Society Conference And Exposition, Heat Treat 2021 - Extended Abstracts
Título del capítulo: Flow effects on the transient behavior of vapor film and bubbles during forced-convective quenching experiments

Autores UNAM:
ROBERTO CRUCES RESENDEZ; JOSE BERNARDO HERNANDEZ MORALES; JOSE ENRIQUE GUZMAN VAZQUEZ;
Autores externos:

Idioma:

Año de publicación:
2021
Palabras clave:

Flow of water; High speed cameras; Probes; Video recording; 950° C; AISI-304 stainless steel; Flow effects; Flowing waters; Freestream velocity; Liquid-vapor interface; Transient behavior; Transient behavior of boiling; Vapor bubble; Vapor films; Quenching


Resumen:

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. Copyright © 2021 ASM International® All rights reserved.


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