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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

THE THERMAL-HYDRAULIC CALCULATION MODEL FOR GAS FLOW IN A FUEL ROD ASSEMBLY

Get access (open in a dialog) DOI: 10.1615/IHTC13.p7.70
12 pages

要約

The paper presents the procedure of the cellular calculation of thermohydraulic parameters of single-phase gas flow in a fuel rod assembly. The procedure is implemented in the DARS program. The program is intended for calculating the distribution of the gas coolant parameters and wall temperatures at an arbitrary, geometrically specified, arrangement of rods in the fuel assembly and an arbitrary, functionally specified in space, heat release in rods.
In order to describe the mathematical model, the flow cross section of the channel of intricate shape is conventionally divided into elementary cells formed by straight lines, connecting the rod centers. Within the limits of a single cell, the coolant parameters and the temperature of the corresponding part of the rod surface are regarded as constant. The entire fuel assembly is viewed as a system of parallel communicating channels that interact with one another. Account is taken of the following mechanisms of interaction between the coolant jets in neighboring cells:
  • energy and momentum transfer due to different values of the temperature and flow velocities in neighboring cells and to the flow turbulence;
  • energy and momentum transfer caused by a different hydraulic resistance of cells.