scholarly journals Growth and Collapse Dynamics of a Vapor Bubble near or at a Wall

Water ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 12
Author(s):  
Huigang Wang ◽  
Chengyu Zhang ◽  
Hongbing Xiong
Keyword(s):  
Vapor Bubble ◽  
Bubble Growth ◽  
Solid Wall ◽  
Bubble Radius ◽  
Entropy Change ◽  
Growth Stages ◽  
Change Rate ◽  
Bubble Density ◽  
Particle Hydrodynamics ◽  
Vapor Mass

This study investigated the dynamics of vapor bubble growth and collapse for a laser-induced bubble. The smoothed particle hydrodynamics (SPH) method was utilized, considering the liquid and vapor phases as the van der Waals (VDW) fluid and the solid wall as a boundary. We compared our numerical results with analytical solutions of bubble density distribution and radius curve slope near a wall and the experimental bubble shape at a wall, which all obtained a fairly good agreement. After validation, nine cases with varying heating distances (L2 to L4) or liquid heights (h2 to h10) were simulated to reproduce bubbles near or at a wall. Average bubble radius, density, vapor mass, velocity, pressure, and temperature during growth and collapse were tracked. A new recognition method based on bubble density was recommended to distinguish the three substages of bubble growth: (a) inertia-controlled, (b) transition, and (c) thermally controlled. A new precollapse substage (Stage (d)) was revealed between the three growth stages and collapse stage (Stage (e)). These five stages were explained from the out-sync between the bubble radius change rate and vapor mass change rate. Further discussions focused on the occurrence of secondary bubbles, shockwave impact on the wall, system entropy change, and energy conversion. The main differences between bubbles near and at the wall were finally concluded.

Vapor bubble growth with a high value of overheating

2007 ◽  
Vol 5 ◽  
pp. 85-90
Author(s):  
S.P. Aktershev ◽  
V.V. Ovchinnikov
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Satisfactory Agreement ◽  
Vapor Bubble ◽  
Bubble Growth ◽  
Bubble Dynamics ◽  
Bubble Radius ◽  
Temperature Inhomogeneity ◽  
Evaporation Front ◽  
Initial Stage

The numerical simulation of the growth of a vapor bubble in inhomogeneously heated liquid is performed; the influence of the temperature inhomogeneity on the bubble dynamics is investigated. The calculations are compared with experimental data for a vapor bubble growing on a cylindrical heater. At high overheating, the results of the calculations are in satisfactory agreement with experimental data for the initial stage of growth of the vapor bubble. In the presence of evaporation fronts, the measured bubble radius values exceed the calculated values. This excess can be explained by the inflow of vapor to the bubble from the evaporation front.

Approximate Solution for the Heat Transfer Controlled Growth of a Steadily Translating Vapor Bubble

2008 ◽  
Author(s):  
Michael Shusser
Keyword(s):  
Heat Transfer ◽  
Approximate Solution ◽  
Vapor Bubble ◽  
Bubble Growth ◽  
Constant Velocity ◽  
Thermal Boundary Layer ◽  
Bubble Radius ◽  
Controlled Growth ◽  
Flow Models ◽  
Rate Comparison

Existing analytical solution for the problem of the heat transfer controlled growth of a spherical vapor bubble moving with a constant velocity under the assumptions of a thin thermal boundary layer and potential flow results in a complicated integral equation for the bubble radius and is too unwieldy to be used in multiphase flow models. The goal of this work is to suggest an approximate solution for this problem that gives correct asymptotic behavior and yields a simpler expression for the bubble growth rate. Comparison with the exact solution showed that this way a good approximation can be obtained.

Effect of Pressure on Bubble Growth Within Liquid Droplets at the Superheat Limit

1982 ◽  
Vol 104 (4) ◽  
pp. 750-757 ◽  
Author(s):  
C. T. Avedisian
Keyword(s):  
Vapor Bubble ◽  
Bubble Growth ◽  
High Speed ◽  
Ambient Pressure ◽  
Organic Liquid ◽  
Liquid Droplets ◽  
Growth Data ◽  
Two Phase ◽  
Photographic Evidence ◽  
Good Agreement

A study of high-pressure bubble growth within liquid droplets heated to their limits of superheat is reported. Droplets of an organic liquid (n-octane) were heated in an immiscible nonvolatile field liquid (glycerine) until they began to boil. High-speed cine photography was used for recording the qualitative aspects of boiling intensity and for obtaining some basic bubble growth data which have not been previously reported. The intensity of droplet boiling was found to be strongly dependent on ambient pressure. At atmospheric pressure the droplets boiled in a comparatively violent manner. At higher pressures photographic evidence revealed a two-phase droplet configuration consisting of an expanding vapor bubble beneath which was suspended a pool of the vaporizing liquid. A qualitative theory for growth of the two-phase droplet was based on assuming that heat for vaporizing the volatile liquid was transferred across a thin thermal boundary layer surrounding the vapor bubble. Measured droplet radii were found to be in relatively good agreement with predicted radii.

Vapor bubble growth in heterogeneous boiling—I. Formulation

1995 ◽  
Vol 38 (5) ◽  
pp. 909-919 ◽  
Author(s):  
Renwei Mei ◽  
Wenchin Chen ◽  
James F. Klausner
Keyword(s):  
Vapor Bubble ◽  
Bubble Growth

Collective Effects on the Growth of Vapor Bubbles in a Superheated Liquid

1984 ◽  
Vol 106 (4) ◽  
pp. 486-490 ◽  
Author(s):  
G. L. Chahine ◽  
H. L. Liu
Keyword(s):  
Collective Behavior ◽  
Bubble Growth ◽  
Theoretical Study ◽  
Pressure Field ◽  
Bubble Radius ◽  
Significant Inhibition ◽  
Collective Effects ◽  
Superheated Liquid ◽  
Vapor Bubbles ◽  
Bubble Interaction

The problem of the growth of a spherical isolated bubble in a superheated liquid has been extensively studied. However, very little work has been done for the case of a cloud of bubbles. The collective behavior of the bubbles departs considerably from that of a single isolated bubble, due to the cumulative modification of the pressure field from all other bubbles. This paper presents a theoretical study on bubble interaction in a superheated liquid during the growth stage. The solution is sought in terms of matched asymptotic expansions in powers of ε, the ratio between rb0, a characteristic bubble radius and l0, the interbubble distance. Numerical results show a significant inhibition of the bubble growth rate due to the presence of interacting bubbles. In addition, the temperature at the bubble wall decreases at a slower rate. Consequently, the overall heat exchange during the bubble growth is reduced.

Vapor bubble growth at the surface of flat and cylindrical heaters

2008 ◽  
Vol 17 (3) ◽  
pp. 227-234 ◽  
Author(s):  
S. P. Aktershev ◽  
V. V. Ovchinnikov
Keyword(s):  
Vapor Bubble ◽  
Bubble Growth
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