Frequency response of boiling flow systems based on a two-fluid model

1986 ◽  
Vol 29 (9) ◽  
pp. 1349-1357 ◽  
Author(s):  
R.P. Roy ◽  
M.-G. Su ◽  
R.C. Dykhuizen ◽  
S.P. Kalra
Keyword(s):  
Frequency Response ◽  
Fluid Model ◽  
Flow Systems ◽  
Boiling Flow ◽  
Two Fluid Model ◽  
Two Fluid

A Linear Time-Domain Two-Fluid Model Analysis of Dynamic Instability in Boiling Flow Systems

1986 ◽  
Vol 108 (1) ◽  
pp. 100-108 ◽  
Author(s):  
R. C. Dykhuizen ◽  
R. P. Roy ◽  
S. P. Kalra
Keyword(s):  
Time Domain ◽  
Dynamic Instability ◽  
Linear Time ◽  
Fluid Model ◽  
Density Wave ◽  
Model Description ◽  
Flow Systems ◽  
Boiling Flow ◽  
Two Fluid Model ◽  
Two Fluid

A linear analysis of dynamic instability in boiling flow systems has been carried out in the time domain. An unequal velocity, unequal temperature two-fluid model description of boiling flow is used. Instability threshold results of the density-wave oscillation type obtained have been compared with experimental data from Refrigerant-113 and water systems with satisfactory agreement.

Nucleate Boiling Flow Simulation With Coupling of Eulerian and Lagrangian Methods

2005 ◽  
Author(s):  
Bosˇtjan Koncˇar ◽  
Ivo Kljenak ◽  
Borut Mavko
Keyword(s):  
Model Simulation ◽  
Fluid Model ◽  
Nucleate Boiling ◽  
Homogeneous Distribution ◽  
Lagrangian Simulation ◽  
Radial Profiles ◽  
Boiling Flow ◽  
Tracking Model ◽  
Two Fluid Model ◽  
Two Fluid

Subcooled boiling flow was simulated by combining the two-fluid model of the CFX-4.4 code and a Lagrangian bubble-tracking model. At present, both models are coupled “off-line” via the local bubble Sauter diameter. The two-fluid model simulation with the CFX-4.4 code provides local values of turbulent kinetic energy field of the liquid phase, which is used as an input for the bubble-tracking model. In the bubble-tracking model, vapour is distributed in the liquid in the form of individually tracked bubbles. The result of the Lagrangian simulation is a non-homogeneous distribution of local Sauter diameter, which is used in the two-fluid model to predict the interfacial forces and interfacial transfer rates of mass and heat transfer. The coupled approach requires a few iterations to obtain a converged solution. The results of the proposed approach were validated against boiling flow experiments from the literature. A good agreement between measured and calculated radial profiles of void fraction and bubble diameter was obtained.

Some Measurements in Subcooled Flow Boiling of Refrigerant-113

1991 ◽  
Vol 113 (1) ◽  
pp. 216-223 ◽  
Author(s):  
A. Hasan ◽  
R. P. Roy ◽  
S. P. Kalra
Keyword(s):  
Flow Boiling ◽  
Fluid Model ◽  
Annular Channel ◽  
Heated Wall ◽  
Subcooled Flow Boiling ◽  
Subcooled Flow ◽  
Boiling Flow ◽  
Phase Temperature ◽  
Two Fluid Model ◽  
Two Fluid

Measurements of local vapor phase residence time fraction, liquid phase temperature, and heated wall temperature were carried out in subcooled flow boiling of Refrigerant-113 through a vertical annular channel. Data are reported for two fluid mass velocities and two pressures over a range of wall heat flux. Estimates of typical vapor bubble size and velocity are given. Some comparisons with a one-dimensional two-fluid model of subcooled boiling flow are also presented.

Numerical investigation of boiling flow of nitrogen in a vertical tube using the two-fluid model

2006 ◽  
Vol 26 (17-18) ◽  
pp. 2425-2432 ◽  
Author(s):  
Xiangdong Li ◽  
Rongshun Wang ◽  
Rongguo Huang ◽  
Yumei Shi
Keyword(s):  
Numerical Investigation ◽  
Fluid Model ◽  
Vertical Tube ◽  
Boiling Flow ◽  
Two Fluid Model ◽  
Two Fluid
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