DNB prediction in assemblies with mixing vanes and unheated tubes

Conference · Wed Jan 01 04:00:00 EST 1986 · Trans. Am. Nucl. Soc.; (United States)

OSTI ID:7179288

Weisman, J; Lim, J C; Ying, S H

In the current study, the Weisman-Pei predictive procedure is applied to departure from nucleate boiling (DNB) data obtained with heater-rod assemblies having mixing vanes attached to the support grids. The data first chosen for examination were obtained in six tests of 16- and 25-rod electrically heated bundles. The tests covered three different mixing vane grids, two rod diameters, included both uniform and nonuniform axial heat fluxes and rod lengths from 2.4 to 4.3 m. Pressure ranged from 103 to 166 bar, mass flux from 4.8 to 17.6 kg/m/sup 2/ h and the average void fraction at the DNB location was below 0.65. The data analysis allowed for the effect of the mixing vanes by appropriately increasing the mixing coefficient used by COBRA. The prediction procedure remained unchanged otherwise.

• Research Organization: Univ. of Cincinnati, OH
• OSTI ID: 7179288
• Report Number(s): CONF-861102-
• Conference Information: Journal Name: Trans. Am. Nucl. Soc.; (United States) Journal Volume: 53
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
ACCURACY
BOILING
C CODES
COMPUTER CODES
COMPUTERIZED SIMULATION
DEPARTURE NUCLEATE BOILING
ENERGY TRANSFER
FLUID MECHANICS
FUEL ASSEMBLIES
HEAT TRANSFER
HYDRAULICS
MECHANICS
NUCLEATE BOILING
PHASE TRANSFORMATIONS
REACTOR CHANNELS
REACTOR COMPONENTS
SIMULATION
SPACERS
VOID FRACTION