scholarly journals A comprehensive, mechanistic heat transfer modeling package for dispersed flow film boiling—Part 2—Implementation and assessment

2015 ◽  
Vol 291 ◽  
pp. 302-311 ◽  
Author(s):  
Michael J. Meholic ◽  
David L. Aumiller ◽  
Fan-Bill Cheung
Keyword(s):  
Heat Transfer ◽  
Film Boiling ◽  
Dispersed Flow ◽  
Heat Transfer Modeling ◽  
Flow Film Boiling

RBHT Steam Cooling and Droplet Injection Pre-Test Analysis Using COBRA-TF

2001 ◽  
Author(s):  
C. Frepoli ◽  
A. J. Ireland ◽  
L. E. Hochreiter ◽  
F. B. Cheung
Keyword(s):  
Heat Transfer ◽  
Local Heat Transfer ◽  
Injection System ◽  
Test Facility ◽  
Film Boiling ◽  
Two Phase ◽  
Field Representation ◽  
Dispersed Flow ◽  
Spacer Grids ◽  
Flow Film Boiling

Abstract The droplet injection experiments to be performed in a 7 × 7 rod bundle heat transfer test facility are being simulated using an advanced thermal hydraulics computer code called COBRA-TF. A current version of the code, which provides a three-dimensional, two-fluid, three-field representation of the two-phase flow, is modified to facilitate the simulation of the droplet field produced by the injection system in the test facility. The liquid phase is split into a continuous liquid field and droplet field where a separate momentum and mass equation is solved for each field, with the effects of spacer grids being properly accounted for. Pre-test analyses using the modified COBRA-TF code have been conducted for different injection conditions. Results indicate that there are specific ranges of conditions that can be simulated within the facility constraints to provide for validation of the dispersed flow film boiling models. The numerical results also show important effects of the spacer grids on the local heat transfer in the dispersed flow film boiling regime.

Dispersed-Flow Film Boiling Heat Transfer Data near Spacer Grids in a Rod Bundle

1983 ◽  
Vol 60 (2) ◽  
pp. 304-313 ◽  
Author(s):  
Graydon L. Yoder ◽  
David G. Morris ◽  
Charles B. Mullins ◽  
Larry J. Ott
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Film Boiling ◽  
Dispersed Flow ◽  
Transfer Data ◽  
Spacer Grids ◽  
Rod Bundle ◽  
Flow Film Boiling

scholarly journals Dispersed Flow Film Boiling

1968 ◽  
Vol 90 (4) ◽  
pp. 399-407 ◽  
Author(s):  
R. P. Forslund ◽  
W. M. Rohsenow
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Drag Coefficient ◽  
Mass Velocity ◽  
Droplet Breakup ◽  
Film Boiling ◽  
Liquid Droplets ◽  
Dispersed Flow ◽  
Inlet Condition ◽  
Flow Film Boiling

New data for dispersed flow film boiling of nitrogen are presented for the following conditions: tube diameter 0.228, 0.323, and 0.462 in. ID; length 4 and 8 ft; mass velocity 70,000 to 19,000 lb/hr ft2; heat flux 0 to 2500 Btu/hr ft2; inlet condition near saturation; exit quality 35 to 315 percent. The previously presented analysis [12] is improved by accounting for droplet breakup due to vapor acceleration, modified drag coefficient on accelerating droplets, and a “Leidenfrost” heat transfer from the wall to the droplets at lower qualities. Measurements are also made to verify the existence of the substantial amount of vapor superheat in the presence of liquid droplets, as predicted by the analysis.

A Mechanistic Model for Droplet Deposition Heat Transfer in Dispersed Flow Film Boiling

2013 ◽  
Vol 181 (1) ◽  
pp. 106-114 ◽  
Author(s):  
Michael J. Meholic ◽  
David L. Aumiller ◽  
Fan-Bill Cheung
Keyword(s):  
Heat Transfer ◽  
Mechanistic Model ◽  
Film Boiling ◽  
Droplet Deposition ◽  
Dispersed Flow ◽  
Flow Film Boiling
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