Analysis of flow instabilities in forced-convection steam generator

2006 ◽  
Vol 17 (3) ◽  
pp. 185-192 ◽  
Author(s):  
G WU ◽  
S QIU ◽  
G SU ◽  
D JIA
Keyword(s):  
Forced Convection ◽  
Steam Generator ◽  
Flow Instabilities

Analysis of Flow Instabilities in Forced-Convection Steam Generator

2006 ◽  
Author(s):  
Ge Ping Wu ◽  
Sui Zheng Qiu ◽  
Guang Hui Su ◽  
Dou Nan Jia
Keyword(s):  
Forced Convection ◽  
Steam Generator ◽  
Practical Importance ◽  
Thermal Capacity ◽  
Flow Instabilities ◽  
Inlet Temperature ◽  
Two Phase ◽  
System Pressure ◽  
Heater Wall ◽  
Physical Phenomena

Because of the practical importance of two-phase instabilities, substantial efforts have been made to date to understand the physical phenomena governing such instabilities and to develop computational tools to model the dynamics. The purpose of this paper is to present a numerical model for the analysis of flow-induced instabilities in forced-convection steam generator. The model is based on the assumption of homogenous two-phase flow and thermodynamic equilibrium of the phases. The thermal capacity of the heater wall has been included in the analysis. The model is used to analysis of flow instabilities in steam generator and to study the effects of system pressure, mass flux, inlet temperature and inlet/outlet restriction, gap size, the ratio of do/di and the ratio of qi/qo on system behavior.

scholarly journals Flow Instabilities in Boiling Two-Phase Natural Circulation Systems: A Review

2008 ◽  
Vol 2008 ◽  
pp. 1-15 ◽  
Author(s):  
A. K. Nayak ◽  
P. K. Vijayan
Keyword(s):  
Forced Convection ◽  
State Of The Art ◽  
Natural Circulation ◽  
Flow Instabilities ◽  
Light Water Reactors ◽  
Two Phase ◽  
Light Water ◽  
Water Reactors ◽  
Art Research ◽  
Core Cooling

Several decades have been spent on the study of flow instabilities in boiling two-phase natural circulation systems. It is felt to have a review and summarize the state-of-the-art research carried out in this area, which would be quite useful to the design and safety of current and future light water reactors with natural circulation core cooling. With that purpose, a review of flow instabilities in boiling natural circulation systems has been carried out. An attempt has been made to classify the instabilities occurring in natural circulation systems similar to that in forced convection boiling systems. The mechanism of instabilities occurring in two-phase natural circulation systems have been explained based on these classifications. The characteristics of different instabilities as well as the effects of different operating and geometric parameters on them have been reviewed.

Numerical Study of the Combined Free-Forced Convection and Mass Transfer Flow Past a Vertical Porous Plate in a Porous Medium with Heat Generation and Thermal Diffusion

2006 ◽  
Vol 11 (4) ◽  
pp. 331-343 ◽  
Author(s):  
M. S. Alam ◽  
M. M. Rahman ◽  
M. A. Samad
Keyword(s):  
Mass Transfer ◽  
Flow Field ◽  
Differential Equations ◽  
Forced Convection ◽  
Heat Generation ◽  
Numerical Study ◽  
Porous Plate ◽  
Integration Scheme ◽  
Suction Parameter ◽  
Transfer Flow

The problem of combined free-forced convection and mass transfer flow over a vertical porous flat plate, in presence of heat generation and thermaldiffusion, is studied numerically. The non-linear partial differential equations and their boundary conditions, describing the problem under consideration, are transformed into a system of ordinary differential equations by using usual similarity transformations. This system is solved numerically by applying Nachtsheim-Swigert shooting iteration technique together with Runge-Kutta sixth order integration scheme. The effects of suction parameter, heat generation parameter and Soret number are examined on the flow field of a hydrogen-air mixture as a non-chemical reacting fluid pair. The analysis of the obtained results showed that the flow field is significantly influenced by these parameters.

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