COMPILATION OF CRITICAL HEAT FLUX DATA IN PWR FUEL ASSEMBLIES WITH NON-UNIFORM AXIAL HEAT FLUX DISTRIBUTION

1982 ◽  
Author(s):  
C. Fighetti ◽  
D. G. Reddy ◽  
M. Merilo
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Flux Distribution ◽  
Heat Flux Distribution ◽  
Flux Data ◽  
Fuel Assemblies ◽  
Axial Heat

Critical Heat Flux in Tubes With Cosine Axial Heat Flux

2005 ◽  
Author(s):  
W. Jaewoo Shim ◽  
Joo-Yong Park ◽  
Ji-Su Lee ◽  
Dong Kook Kim
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Mass Flux ◽  
Flux Distribution ◽  
Average Error ◽  
Uniform Heat Flux ◽  
Heat Flux Distribution ◽  
Uniform Heat ◽  
System Pressure ◽  
Data Points

In this study a method to predict CHF (Critical Heat Flux) in vertical round tubes with cosine heat flux distribution was examined. For this purpose a uniform correlation, based on local condition hypothesis, was developed from 9,366 CHF data points of uniform heat flux heaters. The CHF data points used were collected from 13 different sources had the following parameter ranges: 1.01 ≤ P (pressure) ≤ 206.79 bar, 9.92 ≤ G (mass flux) ≤ 18,619.39 kg/m2s, 0.00102 ≤ D (diameter) ≤ 0.04468 m, 0.0254 ≤ L (length) ≤ 4.966 m, 0.11 ≤ qc (CHF) ≤ 21.42 MW/m2, and −0.87 ≤ X (exit qualities) ≤ 1.58. The result of this work showed that the uniform CHF correlation could be used to predict CHF accurately in a non-uniform heat flux heater for wide flow conditions. Furthermore, the location, where CHF occurs in non-uniform heat flux distribution, can also be determined accurately with the local variables: the system pressure (P), tube diameter (D), mass flux of water (G), and true mass flux of vapor (GXt). The new correlation predicted CHF with cosine heat flux, 297 data points from 5 different published sources, within the root mean square error of 12.42% and average error of 1.06% using the heat balance method.

Experimental investigation on repeatability of CHF in rod bundle with non-uniform axial heat flux distribution

2016 ◽  
Vol 90 ◽  
pp. 151-154 ◽  
Author(s):  
Shengjie Qin ◽  
Xuemei Lang ◽  
Shijie Xie ◽  
Pengzhou Li ◽  
Wenbin Zhuo ◽  
...  
Keyword(s):  
Heat Flux ◽  
Experimental Investigation ◽  
Flux Distribution ◽  
Heat Flux Distribution ◽  
Rod Bundle ◽  
Axial Heat

Phase-Resolved Heat-Flux Measurements on the Blade of a Full-Scale Rotating Turbine

1989 ◽  
Vol 111 (1) ◽  
pp. 8-19 ◽  
Author(s):  
M. G. Dunn ◽  
P. J. Seymour ◽  
S. H. Woodward ◽  
W. K. George ◽  
R. E. Chupp
Keyword(s):  
Heat Flux ◽  
Flux Distribution ◽  
Design Flow ◽  
Heat Flux Distribution ◽  
Time Resolved ◽  
Pressure Surface ◽  
Flux Data ◽  
Heated Air ◽  
Cutting Frequency ◽  
Flux Measurements

This paper presents detailed phase-resolved heat-flux data obtained on the blade of a Teledyne 702 HP full-stage rotating turbine. A shock tube is used as a short-duration source of heated air and platinum thin-film gages are used to obtain the heat-flux measurements. Results are presented along the midspan at several locations on the blade suction and pressure surfaces from the stagnation point to near the trailing edge. For these measurements, the turbine was operating at the design flow function and at 100 percent corrected speed. Results are presented for the design vane/blade spacing (0.19 Cs) and at a wide spacing (0.50 Cs). Data are also presented illustrating the phase-resolved blade heat-flux distribution with upstream cold gas injection from discrete holes on the vane surface. The results illustrate that several successive passages can be superimposed upon each other and that a heat-flux pattern can be determined within the passage. A Fourier analysis of the heat-flux record reveals contributions from the fundamental and first harmonic of the passage cutting frequency. Time-resolved surface pressure data obtained on the blade pressure surface are compared with heat-flux data.

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