scholarly journals Dynamics of bubble growth under a heated substrate

2021 ◽  
Vol 2119 (1) ◽  
pp. 012134
Author(s):  
D Y Kochkin ◽  
A S Mungalov ◽  
I A Derevyannikov
Keyword(s):  
Bubble Growth ◽  
Buoyancy Force ◽  
Bubble Dynamics ◽  
Bubble Diameter ◽  
Growth Dynamics ◽  
Heating Power ◽  
Gas Bubble ◽  
Shadow Method ◽  
Heated Substrate ◽  
Heating Plate

Abstract This paper investigates the growth dynamics of a vapor-gas bubble pressed against a heating plate by the buoyancy force. The shadow method was used to capture images, which were then automatically processed to calculate the size of the bubble. As expected, the bubble dynamics significantly depends on the heating power. It was found that the ratio of bubble diameter to bubble height increases as it grows.

Vapor and Gas-Bubble Growth Dynamics around Laser-Irradiated, Water-Immersed Plasmonic Nanoparticles

ACS Nano ◽  
2017 ◽  
Vol 11 (2) ◽  
pp. 2045-2051 ◽  
Author(s):  
Yuliang Wang ◽  
Mikhail E. Zaytsev ◽  
Hai Le The ◽  
Jan C. T. Eijkel ◽  
Harold J. W. Zandvliet ◽  
...  
Keyword(s):  
Bubble Growth ◽  
Growth Dynamics ◽  
Plasmonic Nanoparticles ◽  
Gas Bubble

scholarly journals Dynamics of bubble growth during boiling at microgravity

2021 ◽  
Vol 2119 (1) ◽  
pp. 012170
Author(s):  
F Ronshin ◽  
A Sielaff ◽  
L Tadrist ◽  
P Stephan ◽  
O Kabov
Keyword(s):  
Heat Transfer ◽  
Bubble Growth ◽  
Boiling Heat Transfer ◽  
Bubble Dynamics ◽  
Heated Surface ◽  
Space Station ◽  
Growth Dynamics ◽  
Special Focus ◽  
Transfer Processes ◽  
Microgravity Conditions

Abstract The purpose of this investigation is to study the mechanisms of boiling heat transfer in microgravity conditions. The RUBI (Reference mUltiscale Boiling Investigation) is an experiment where the basic phenomena of boiling heat transfer processes on a heated surface are investigated on the ISS (International Space Station). The special focus is paid to the coupling of macroscopic bubble dynamics from nucleation, growth and detachment combined with the microscopic phenomena in the thin films and micro layers on the heater, underneath the boiling bubbles. The image treatment program has been developed in order to extract the bubble volume as well as the contact angle from the experimental images. The first data of the bubble growth dynamics have been obtained and analysed.

Computational and Experimental Characterization of Single Bubble Dynamics in Isothermal Liquid Pools

2007 ◽  
Author(s):  
A. Subramani ◽  
S. K. Kasimsetty ◽  
R. M. Manglik ◽  
M. A. Jog
Keyword(s):  
Surface Tension ◽  
Bubble Growth ◽  
High Speed ◽  
Bubble Dynamics ◽  
Great Influence ◽  
Growth Dynamics ◽  
Equivalent Diameter ◽  
Parametric Effects ◽  
Liquid Pools ◽  
Visualization Techniques

The process of bubble growth is of great influence on the bubble volume and bubble rise velocity. The overall behavior of bubbles at fluid interfaces depends strongly on bubble growth and the closely linked process of bubble detachment. In the present study, the dynamics of a single gas bubble emanating from an orifice submerged in isothermal liquid pools is investigated computationally and experimentally. The parametric effects of liquid properties, capillary diameters and air flow rates on the bubble shape, equivalent diameter, and growth times on the dynamic behavior (incipience, growth and necking) of air bubbles, in fluids of varying surface tension and viscosity, as it grows from a tip of a sub-millimeter-scale capillary orifice have been studied. Computational solutions have been obtained by solving the complete set of governing equations using Volume of Fluid (VOF) interface tracking method. The CFD model has been verified experimentally using optical high speed micro-scale flow visualization techniques. The results were analyzed in a theoretical stand point considering the various forces acting on the bubble such as forces due to buoyancy, viscosity, surface tension, liquid inertia, and gas momentum transport, and the consequent motion of the gas-liquid interface. The results obtained ascertain the role of liquid-gas interfacial forces as well as the fluid properties on the bubble growth dynamics.

STUDY OF ISOLATED GAS BUBBLE DYNAMICS IN A CENTRIFUGAL ROTOR

2019 ◽  
Author(s):  
Higor Veiga ◽  
Edgar Ofuchi ◽  
Henrique Stel ◽  
Ernesto Mancilla ◽  
Dalton Bertoldi ◽  
...  
Keyword(s):  
Bubble Dynamics ◽  
Gas Bubble

Understanding gas bubble trauma in an era of hydropower expansion: how do fish compensate at depth?

2020 ◽  
Vol 77 (3) ◽  
pp. 556-563 ◽  
Author(s):  
Naomi K. Pleizier ◽  
Charlotte Nelson ◽  
Steven J. Cooke ◽  
Colin J. Brauner
Keyword(s):  
Bubble Growth ◽  
Gas Bubble ◽  
Hydroelectric Dams ◽  
Dissolved Gas ◽  
Empirical Relationships ◽  
Lethal Effects ◽  
Exposed Fish ◽  
Total Dissolved Gas ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
The Relationship

Hydrostatic pressure is known to protect fish from damage by total dissolved gas (TDG) supersaturation, but empirical relationships are lacking. In this study we demonstrate the relationship between depth, TDG, and gas bubble trauma (GBT). Hydroelectric dams generate TDG supersaturation that causes bubble growth in the tissues of aquatic animals, resulting in sublethal and lethal effects. We exposed fish to 100%, 115%, 120%, and 130% TDG at 16 and 63 cm of depth and recorded time to 50% loss of equilibrium and sublethal symptoms. Our linear model of the log-transformed time to 50% LOE (R2 = 0.94) was improved by including depth. Based on our model, a depth of 47 cm compensated for the effects of 4.1% (±1.3% SE) TDG supersaturation. Our experiment reveals that once the surface threshold for GBT from TDG supersaturation is known, depth protects rainbow trout (Oncorhynchus mykiss) from GBT by 9.7% TDG supersaturation per metre depth. Our results can be used to estimate the impacts of TDG on fish downstream of dams and to develop improved guidelines for TDG.

Testing a simple model of gas bubble dynamics in porous media

2015 ◽  
Vol 51 (2) ◽  
pp. 1036-1049 ◽  
Author(s):  
Jorge A. Ramirez ◽  
Andy J. Baird ◽  
Tom J. Coulthard ◽  
J. Michael Waddington
Keyword(s):  
Porous Media ◽  
Simple Model ◽  
Bubble Dynamics ◽  
Gas Bubble

Nuclei and Cavitation

1970 ◽  
Vol 92 (4) ◽  
pp. 681-688 ◽  
Author(s):  
J. William Holl
Keyword(s):  
Bubble Growth ◽  
Scale Effects ◽  
Gas Bubbles ◽  
Gas Content ◽  
Gas Bubble ◽  
Cavitation Nuclei ◽  
The Stability

This paper is a review of existing knowledge on cavitation nuclei. The lack of significant tensions in ordinary liquids is due to so-called weak spots or cavitation nuclei. The various forms which have been proposed for nuclei are gas bubbles, gas in a crevice, gas bubble with organic skin, and a hydrophobic solid. The stability argument leading to the postulation of the Harvey model is reviewed. Aspects of bubble growth are considered and it is shown that bubbles having different initial sizes will undergo vaporous cavitation at different liquid tensions. The three modes of growth, namely vaporous, pseudo, and gaseous are presented and implications concerning the interpretation of data are considered. The question of the source of nuclei and implications concerning scale effects are made. The measurement of nuclei is considered together with experiments on the effect of gas content on incipient cavitation.

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