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

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.

Experimental Verification of the Performance of a Droplet Injection System for Use in a Rod Bundle Test Facility

2001 ◽  
Author(s):  
A. J. Ireland ◽  
E. Rosal ◽  
L. E. Hochreiter ◽  
F. B. Cheung
Keyword(s):  
Heat Transfer ◽  
Nuclear Reactor ◽  
Injection System ◽  
Test Facility ◽  
Film Boiling ◽  
Size Distributions ◽  
Dispersed Flow ◽  
Rod Bundle ◽  
Drop Size Distributions ◽  
Flow Film Boiling

Abstract A droplet injection system has been developed for use in a rod bundle heat transfer test facility designed specifically for the study of dispersed flow film boiling during reflood transients in a nuclear reactor. Three different injectors having various pitch configurations and hole patterns were tested. The drop field produced by each was characterized using a laser-assisted size measurement technique. Appropriate mean diameter and drop size distributions that closely simulate the drop field encountered in a reactor bundle assembly under reflood conditions was obtained. The drop injection system developed can readily be employed in the rod bundle test facility to investigate the droplet heat transfer in the dispersed flow film boiling regime.

An Experimental Study of Rod Bundle Dispersed-Flow Film Boiling with High-Pressure Water

1985 ◽  
Vol 69 (1) ◽  
pp. 82-93 ◽  
Author(s):  
David G. Morris ◽  
Charles B. Mullins ◽  
Graydon L. Yoder
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Film Boiling ◽  
Dispersed Flow ◽  
Rod Bundle ◽  
Pressure Water ◽  
Flow Film Boiling
Sign in / Sign up

Export Citation Format

Share Document