scholarly journals CRITICAL HEAT FLUX AND FLOW PATTERN CHARACTERISTICS OF HIGH PRESSURE BOILING WATER IN FORCED CONVECTION

1962 ◽  
Author(s):  
F.E. Tippets
Keyword(s):  
Heat Flux ◽  
High Pressure ◽  
Flow Pattern ◽  
Forced Convection ◽  
Critical Heat Flux ◽  
Boiling Water

Critical Heat Fluxes and Flow Patterns in High-Pressure Boiling Water Flows

1964 ◽  
Vol 86 (1) ◽  
pp. 12-22 ◽  
Author(s):  
F. E. Tippets
Keyword(s):  
Heat Flux ◽  
High Pressure ◽  
Critical Heat Flux ◽  
Rectangular Channel ◽  
Motion Pictures ◽  
Flow Patterns ◽  
Heat Fluxes ◽  
Boiling Water ◽  
Forced Flow ◽  
Flux Level

High-speed motion pictures (4300 pictures/sec) of boiling water flow patterns in conditions of forced flow at 1000 psia pressure in a vertical heated rectangular channel were taken over the range of mass velocities from 50 to 400 lb/sec-ft2, fluid states from bulk subcooled liquid flow to bulk boiling flow at 0.66 steam quality, and heat fluxes up to and including the critical heat flux level. Eighty critical heat flux determinations were made in the course of the experiment at 1000 psia in conditions of bulk boiling. The motion pictures provide photographic evidence of the general arrangement of the flow in conditions of bulk boiling at high pressure with heat fluxes near and including the critical heat flux level.

Analysis of the Critical Heat-Flux Condition in High-Pressure Boiling Water Flows

1964 ◽  
Vol 86 (1) ◽  
pp. 23-33 ◽  
Author(s):  
F. E. Tippets
Keyword(s):  
Heat Flux ◽  
High Pressure ◽  
Critical Heat Flux ◽  
High Speed ◽  
Boiling Water ◽  
Two Phase ◽  
Local Flow ◽  
Flow Parameters ◽  
Fluid Properties ◽  
Data Points

Based on the two-phase flow patterns shown in high-speed motion pictures of the process, a general working equation is derived which relates the critical heat flux for high-pressure bulk boiling water in forced convection to the significant local flow parameters and fluid properties. The equation is applied to a representative selection of several hundred data points from the major available sources for the purpose of investigating trends in the data and to test the validity of the equation.

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.

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