Refrigerant–Water Scaling of Critical Heat Flux in Round Tubes—Subcooled Forced-Convection Boiling

1973 ◽  
Vol 95 (2) ◽  
pp. 279-281 ◽  
Author(s):  
J. C. Purcupile ◽  
L. S. Tong ◽  
S. W. Gouse
Keyword(s):  
Heat Flux ◽  
Forced Convection ◽  
Critical Heat Flux ◽  
Test Data ◽  
Mass Velocity ◽  
Circular Tube ◽  
Scaling Factor ◽  
Vapor Density ◽  
Density Ratios

Subcooled, critical heat-flux test data on refrigerant R-11 flowing vertically in a uniformly heated circular tube is reported. Using the data reported by Coeffield for R-113, a method is presented for obtaining a direct heat-flux scaling factor between refrigerant and water with the same geometry, mass velocity, and local flowing quality when the pressure is adjusted so that the liquid-to-vapor density ratios are equal in both systems.

Critical Heat Flux in Saturated Forced Convection Boiling on a Heated Disk With an Impinging Jet

1987 ◽  
Vol 109 (4) ◽  
pp. 991-996 ◽  
Author(s):  
M. Monde
Keyword(s):  
Heat Flux ◽  
High Pressure ◽  
Forced Convection ◽  
Critical Heat Flux ◽  
Weber Number ◽  
High Pressures ◽  
Density Ratio ◽  
Vapor Density ◽  
Heated Disk ◽  
Jet Velocity

Critical heat flux during forced convection boiling on an open heated disk being supplied with saturated liquids through a small round jet which impinges at the center of the disk has been studied experimentally employing refrigerant R12 at comparatively high pressures from 0.6 to 2.8 MPa. Generalized correlations, predicting the CHF within an experimental range of liquid-to-vapor density ratio 5.3–41.25 and the reciprocal of Weber number 2 × 10−3–2 × 10−7, are given for three different characteristic regimes: V-regime where the CHF increases with an increase in the jet velocity, I-regime where the CHF is nearly constant with jet velocity, and HP-regime where the CHF appears only at high pressure and again rises with an increase in the jet velocity.

THE CALCULATION OF CRITICAL HEAT FLUX IN FORCED CONVECTION BOILING

1974 ◽  
Author(s):  
P. B. Whalley ◽  
P. Hutchinson ◽  
Geoffrey F. Hewitt
Keyword(s):  
Heat Flux ◽  
Forced Convection ◽  
Critical Heat Flux

Experimental Investigation of Critical Heat Flux in Microchannels for Flow-Field Probes

2009 ◽  
Author(s):  
Ali Kos¸ar ◽  
Yoav Peles ◽  
Arthur E. Bergles ◽  
Gregory S. Cole
Keyword(s):  
Heat Flux ◽  
Experimental Investigation ◽  
Critical Heat Flux ◽  
Mass Velocity ◽  
Thermal Condition ◽  
Average Error ◽  
New Correlation ◽  
Hydraulic Conditions ◽  
Data Points ◽  
Heated Length

Critical heat flux (CHF) of water in circular stainless steel microchannels with inner diameters ranging from ∼127μm to ∼254 μm was investigated. Forty-five CHF data points were acquired over mass velocities ranging from 1,200 kg/m2s to 53,000 kg/m2s, heated lengths from 2 cm to 8 cm, and exit qualities from −0.2 to 0.15. Most of the exit qualities fell below 0.1. It was found that CHF conditions were more dependent on mass velocity and heated length than on exit thermal condition. The results were also compared to six CHF correlations, with a mean average error ranging from 22% to 261.8%. A new correlation was proposed to better predict the critical heat flux data under the thermal-hydraulic conditions studied in this investigation. In developing the correlation, 319 data points were added from two previous studies.

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