Dalton, AW

Untitled

Date

1983-04-19

Authors

Dalton, AW

Publisher

BHRA Fluid Engineering

Abstract

A computer program, NAIADQ, has been developed to simulate the dynamic response of water, in a one—dimensional flow path, to rapid changes in the axial distribution of the power input to the channel. The dynamic behaviour of the coolant is described, in the single—phase state, in terms of three equations representing the conservation of its mass, momentum and energy. For the two—phase state a fourth equation, representing the conservation of the vapour mass is introduced in which the vapour is generated at a nonequilibrium rate; to compensate for this, the liquid phase is allowed to superheat. It is further assumed that the vapour is always in a saturated state, that the two phases have the same axial velocity and that the pressure at each axial location is the same for both phases. To describe the redistribution of the heat, injected into the flow path, between the heat source and the coolant fluid, a simple pipe model and a range of heat transfer options are available in the code together with equations of state for both the liquid and two—phase state. The code has been used to simulate published data on two different types of experiments, one relating to the expulsion of water from a rapidly heated channel and the other to reactivity induced power transients in an experimental water—cooled nuclear reactor.

Description

Physical copy held by ANSTO Library at DDC: 532.0510724/1

Keywords

Computer codes, Water, Flow rate, Coolants, Vapors, Two-phase flow, Water cooled reactors

Citation

Dalton, A. D. A nonequilibrium axial flow model for the calculation of transient behavior in two-phase flow. Paper presented to the International Conference on Physical Modelling of Multi-Phase Flow, April 1921, 1983, Coventry, England. In Papers presented at the International Conference on Physical Modelling of Multi-Phase Flow, Coventry, England, April, 1983, (pp. 89-102). Cranfield, Bedford, England : BHRA Fluid Engineering.