Boiling Heat Transfer Characteristics and Film Boiling Collapse Temperature Through the Two-Dimensional Temperature Field Measurement: Examination of Condition in High Liquid Subcooling Condition

2016 ◽  
Author(s):  
Hajime Takeuchi ◽  
Hiroyasu Ohtake ◽  
Masahiro Ueno ◽  
Hiroshi Washida ◽  
Koji Hasegawa
Keyword(s):  
Boiling Heat Transfer ◽  
Liquid Velocity ◽  
Atmospheric Condition ◽  
Film Boiling ◽  
Back Side ◽  
Heat Transfer Characteristics ◽  
Silver Plate ◽  
Impingement Jet ◽  
Collapse Temperature ◽  
Length Width

The behavior of rewetting on a high superheated and dry surface, focusing on rewetting temperature just as collapse of saturated and subcooled film boiling was investigated experimentally. Saturated and subcooled impingement jet experiments were conducted by using a silver plate with 40.0 mm × 40.0 mm (length × width) and the distilled water at atmospheric condition. The liquid subcooling was 0, 10, 20, 30, 40, 50, and 75K, respectively. Temperature of the test heater was measured by using a infrared thermometer from a back side of it. Although the liquid velocity and liquid subcooling change, the sputtering temperature, i.e., rewetting initiation temperature, was close to 200 °C predicted by Nishio’s correlation.

Measurements of Rewetting Temperatures of Hot Dry Surface in Saturated and Subcooled Film Boiling

2011 ◽  
Author(s):  
Nozomi Nagashima ◽  
Hiroyasu Ohtake ◽  
Yasuo Koizumi
Keyword(s):  
Heat Flux ◽  
Silicon Wafer ◽  
Pure Water ◽  
Atmospheric Condition ◽  
Film Boiling ◽  
Back Side ◽  
Quenching Temperature ◽  
Infrared Thermometer ◽  
Impingement Jet ◽  
Minimum Heat

The behavior of rewetting on a high superheated and dry surface, focusing on rewetting temperature just as collapse of saturated and subcooled film boiling was investigated experimentally by using a commercial separated-type infrared thermometer. Saturated and subcooled impingement jet experiments were conducted by using a silicon wafer with 20 mm length, 20 mm width and 0.5 mm thickness and pure water at atmospheric condition. Temperature of the test heater was measured by using a commercial separated-type infrared thermometer from a back side of it. The present experimental results showed that as the liquid subcooling was high, Minimum Heat Flux temperature (i.e., Minimum Film Boiling, rewetting temperature or quenching temperature) was higher. Furthermore, the effect of the rewetting temperature on liquid subcooling was similar to that of Dhir-Purohit’s correlation quantitatively.

An Experimental Study On Cryogenic Spray Quenching of a Circular Metal Disk I. Effects of Mass Flux, Spray Fluid Inlet Subcooling, and Gravity

2021 ◽  
Author(s):  
Jun Dong ◽  
Hao Wang ◽  
Samuel Darr ◽  
Jason Hartwig ◽  
Jacob Chung
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Mass Flux ◽  
Boiling Heat Transfer ◽  
Film Boiling ◽  
Gravitational Acceleration ◽  
Heat Transfer Characteristics ◽  
Spray Cone ◽  
Transfer Characteristics ◽  
Metal Disk

Abstract This is the first part of a two-paper series that reports the design, experimentation, and results of a spray quenching experiment of a circular metal disk in terrestrial gravity conditions. The objective of this experiment is to provide experimental data and corresponding analysis on the heat transfer characteristics and chilldown performance of the cryogenic spray quenching process. In this paper, the presented continuous-flow spray quenching results include the spray-cone angle visualization, spray cooling heat transfer characteristics represented by chilldown curves and boiling curves, gravity effects, and Leidenfrost rewet point temperatures. Additionally, detailed discussion is given on the film boiling heat transfer and rewet temperature in terms of various contributing factors such as gravitational acceleration, spray mass flux, and radial position on the plate. Based on experimental data, empirical correlations for film boiling heat transfer coefficient and rewet temperatures are provided. We expect that, the current terrestrial study would offer invaluable information for the design of a robust in-space cryogenic propellant storage tank spray chilldown system.

Mechanism and Modeling of Rewetting Initiation of Hot Dry Surface in Saturated and Subcooled Film Boiling

2010 ◽  
Author(s):  
Hiroyasu Ohtake ◽  
Shingo Kobayashi ◽  
Nozomi Nagashima ◽  
Yasuo Koizumi
Keyword(s):  
Pure Water ◽  
Atmospheric Condition ◽  
Taylor Instability ◽  
Film Boiling ◽  
Physical Parameters ◽  
Falling Film ◽  
Two Phase ◽  
Conduction Model ◽  
Impingement Jet ◽  
Rayleigh Taylor Instability

The behavior of rewetting on a high superheated and dry surface, focusing on rewetting temperature just as collapse of saturated and subcooled film boiling was investigated experimentally and analytically. Saturated and subcooled pool film-boiling experiments were conducted by using a Silicon wafer with 20 mm length, 20 mm width and 0.5 mm thickness and pure water at atmospheric condition. Saturated and subcooled impingement jet experiments were also preformed. Then, the model analysis of rewetting initiation of a hot dry surface in saturated and subcooled film boiling was constructed by using hydrodynamics instability on liquid-vapor interface (Rayleigh-Taylor instability) and a heat conduction model (rewetting model under a falling film). Some physical parameters on Rayleigh-Taylor instability, for example released period of bubble from vapor film on a heater, generated volume rate of vapor and so on, were estimated by using Two-Phase Boundary Layer theory of saturated and subcooled film boiling. The present analytical results also showed that as the liquid subcooling was high, MHF temperature was higher. Namely, the predictions agreed with the present experimental results and Dhir-Purohit’s correlation. In addition, the present model of MHF temperature was developed by taking into account the dependence on thermal conductivity of wall of the MHF-temperature.

Study on Behavior of Rewetting on Hot Wall

2007 ◽  
Author(s):  
Hiroyasu Ohtake ◽  
Yasuo Koizumi ◽  
Shingo Kobayashi ◽  
Takeshi Watanabe
Keyword(s):  
Heat Conduction ◽  
Silicon Wafer ◽  
Liquid Layer ◽  
Pure Water ◽  
Atmospheric Condition ◽  
Film Boiling ◽  
Conduction Model ◽  
Vapor Interface ◽  
Impingement Jet ◽  
Superheated Surface

The behavior of rewetting on high superheated surface, focusing on rewetting temperature during collapse of saturated and subcooled film boiling was investigated experimentally and analytically. Saturated and subcooled film-boiling experiments were conducted by using a Silicon wafer with 20 mm length, 20 mm width and 0.5 mm thickness and pure water at atmospheric condition. Both pool boiling and impingement jet experiments were preformed in the present study. Then, the present experimental results were examined by using hydrodynamics instability on liquid-vapor interface (Rayleigth-Tayor instability) and a heat conduction model (rewetting model under a falling-flow of a liquid layer).

Mechanism of Rewetting Initiation of Hot Dry Surface in Saturated and Subcooled Film Boiling

2008 ◽  
Author(s):  
Hiroyasu Ohtake ◽  
Shingo Kobayashi ◽  
Yasuo Koizumi
Keyword(s):  
Pure Water ◽  
Atmospheric Condition ◽  
Experimental Results ◽  
Film Boiling ◽  
Physical Parameters ◽  
Two Phase ◽  
Conduction Model ◽  
Impingement Jet ◽  
Rayleigh Taylor Instability ◽  
Superheated Surface

The behavior of rewetting on high superheated surface, focusing on rewetting temperature during collapse of saturated and subcooled film boiling was investigated experimentally and analytically. Saturated and subcooled film-boiling experiments were conducted by using a Silicon wafer with 20 mm length, 20 mm width and 0.5 mm thickness and pure water at atmospheric condition. Both pool boiling and impingement jet experiments were preformed in the present study. Then, the present experimental results were examined by using hydrodynamics instability on liquid-vapor interface (Rayleigth-Tayor instability) and a heat conduction model (rewetting model under a falling-flow of a liquid layer). Some physical parameters on Rayleigh-Taylor instability, for example released period of bubble from vapor film on a heater, generated volume rate of vapor and so on, were estimated by using Two-Phase Boundary Layer theory of saturated and subcooled film boiling. The present analytical results showed that as the liquid subcooling was high, MHF temperature was higher. Namely, the predictions agreed with the present experimental results and Dhir-Purohit’s correlation.

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