scholarly journals VAPOR-BUBBLE-GROWTH RATES IN SUPERHEATED LIQUID METALS

1966 ◽  
Author(s):  
R P Wichner ◽  
H W Hoffman
Keyword(s):  
Growth Rates ◽  
Vapor Bubble ◽  
Bubble Growth ◽  
Liquid Metals ◽  
Superheated Liquid

Inertial-thermal governed vapor bubble growth in highly superheated liquid

2005 ◽  
Vol 41 (10) ◽  
pp. 855-863 ◽  
Author(s):  
Alexandr A. Avdeev ◽  
Yuri B. Zudin
Keyword(s):  
Vapor Bubble ◽  
Bubble Growth ◽  
Superheated Liquid

scholarly journals Modelling Microlayer Formation in Boiling Sodium

Fluids ◽  
2020 ◽  
Vol 5 (4) ◽  
pp. 213
Author(s):  
Giovanni Giustini ◽  
Hyungdae Kim ◽  
Raad I. Issa ◽  
Michael J. Bluck
Keyword(s):  
Solid Surface ◽  
Vapor Bubble ◽  
Bubble Growth ◽  
Liquid Metals ◽  
Heated Surface ◽  
Algebraic Model ◽  
Optical Observations ◽  
Working Fluid ◽  
Sodium Vapor ◽  
Flow Solver

During boiling at a solid surface, it is often the case that a liquid layer of a few microns of thickness (’microlayer’) is formed beneath a bubble growing on the heated surface. Microlayers have been observed forming beneath bubbles in various transparent fluids, such as water and refrigerants, subsequently depleting due to evaporation, thus contributing significantly to bubble growth and possibly generating the majority of vapor in a bubble. On the other hand, boiling of opaque fluids, such as liquid metals, is not amenable to optical observations, and microlayers have not yet been observed in liquid metals. Among that class of fluids is sodium, suitable as a coolant for nuclear reactors and as the working fluid in phase-change solar power receivers. In order to support these applications, it is necessary to understand the boiling behavior of sodium and identify the parameters that might influence microlayer formation during boiling of this important fluid. This paper presents simulations of the hydrodynamics of sodium vapor bubble growth at a surface. An interface capturing flow solver has been implemented in the OpenFOAM code and used to predict the behavior of a sodium vapor bubble near a solid surface in typical boiling conditions. The methodology has been validated using recently reported direct experimental observations of microlayer formation in water and then applied to sodium boiling cases. Simulations indicate that microlayers are formed in sodium in a similar fashion to water. Comparison of simulation results with an extant algebraic model of microlayer formation showed good agreement, which increases confidence in the current predictions of microlayer formation. Typical values of microlayer thickness thus computed indicate that the microlayer is likely to play an important role during bubble growth in sodium.

Magnetic Field Effects on Bubble Growth in Boiling Liquid Metals

1978 ◽  
Vol 100 (3) ◽  
pp. 466-472 ◽  
Author(s):  
C. P. C. Wong ◽  
G. C. Vliet ◽  
P. S. Schmidt
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Bubble Growth ◽  
Boiling Heat Transfer ◽  
Liquid Metals ◽  
Nucleate Boiling ◽  
Superheated Liquid ◽  
Magnetic Field Effects ◽  
Strong Magnetic Fields ◽  
Nucleate Boiling Heat Transfer

A theoretical analysis of bubble growth in superheated liquid metals shows that in the presence of a strong magnetic field, the growing bubble would assume an elongated shape and the volume would be less than that for the nonmagnetic case. As time progresses and for higher field strengths the bubble becomes more elongated. The analytical results are used to estimate the effect of strong magnetic fields on nucleate boiling heat transfer.

scholarly journals New semi-analytical solution of the problem of vapor bubble growth in superheated liquid

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
A. A. Chernov ◽  
A. A. Pil’nik ◽  
I. V. Vladyko ◽  
S. I. Lezhnin
Keyword(s):  
Analytical Solution ◽  
Vapor Bubble ◽  
Bubble Growth ◽  
Moving Boundary ◽  
Initial Boundary ◽  
Initial Boundary Value Problem ◽  
Superheated Liquid ◽  
Conductivity Equation ◽  
Wide Range ◽  
Liquid Evaporation

Abstract This paper presents a mathematical model of the vapor bubble growth in an initially uniformly superheated liquid. This model takes into account simultaneously the dynamic and thermal effects and includes the well-known classical equations: the Rayleigh equation and the heat conductivity equation, written with consideration of specifics associated with the process of liquid evaporation. We have obtained a semi-analytical solution to the problem, which consists in reducing the initial boundary value problem with a moving boundary to a system of ordinary differential equations of the first order, valid in a wide range of operating parameters of the process at all its stages: from inertial to thermal, including the transitional one. It is shown that at large times this solution is consistent with the known solutions of other authors obtained in the framework of the energy thermal model, in particular, for the high Jacob numbers, it is consistent with the Plesset–Zwick solution.

Analytical Description of Vapor Bubble Growth in a Superheated Liquid: A New Approach

2020 ◽  
Vol 65 (11) ◽  
pp. 405-408
Author(s):  
A. A. Chernov ◽  
M. A. Guzev ◽  
A. A. Pil’nik ◽  
I. V. Vladyko ◽  
V. M. Chudnovsky
Keyword(s):  
Vapor Bubble ◽  
Bubble Growth ◽  
Analytical Description ◽  
Superheated Liquid ◽  
New Approach

Numerical Simulation of Growth of a Vapor Bubble During Flow Boiling of Water in a Microchannel

2004 ◽  
Author(s):  
Abhijit Mukherjee ◽  
Satish G. Kandlikar
Keyword(s):  
Growth Rate ◽  
Vapor Bubble ◽  
Bubble Growth ◽  
Stokes Equations ◽  
Flow Boiling ◽  
Thin Liquid Film ◽  
Navier Stokes ◽  
Superheated Liquid ◽  
Navier Stokes Equations ◽  
Energy Equations

The present study is performed to numerically analyze growth of a vapor bubble during flow of water in a microchannel. The complete Navier-Stokes equations along with continuity and energy equations are solved using the SIMPLER method. The liquid vapor interface is captured using the level set technique. The microchannel is 200 microns in square cross-section and the bubble is placed at the center of the channel with superheated liquid around it. The results show steady initial bubble growth followed by a rapid axial expansion after the bubble fills the channel with a thin liquid film around it. The bubble then rapidly turns into a plug and fills up the entire channel. A trapped liquid layer is observed between the bubble and the channel as the plug elongates. The bubble growth rate increased with the incoming liquid superheat and formation of vapor patch at the walls is found to be dependent on the bubble growth rate. The upstream interface of the bubble is found to exhibit both forward and reverse movement during bubble growth. Results show little effect of gravity on the bubble growth under the specified conditions. The bubble growth features obtained from numerical results are found to be qualitatively similar to experimental observations.

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