A Numerical Study on the Contamination of Microgravity Liquid Diffusivity Measurements by Void-Generated Thermocapillary Convection

2006 ◽  
Author(s):  
M. Kassemi ◽  
S. Barsi ◽  
Iwan Alexander ◽  
M. Banish
Keyword(s):  
Thermocapillary Convection ◽  
Numerical Study ◽  
Diffusivity Measurements ◽  
Liquid Diffusivity

scholarly journals Numerical study on thermocapillary convection in liquid bridge under surrounding shear gas stream

2016 ◽  
Vol 40 ◽  
pp. 06001
Author(s):  
Ruquan Liang ◽  
Limin Kong ◽  
Fuqiang Yan ◽  
Di Bei ◽  
Shuo Zhang
Keyword(s):  
Liquid Bridge ◽  
Thermocapillary Convection ◽  
Numerical Study

Numerical study of three-dimensional combined buoyancy and thermocapillary convection and evaluation of entropy generation

2013 ◽  
Vol 24 (1) ◽  
pp. 148-168 ◽  
Author(s):  
Hakan F. Oztop ◽  
Kolsi Lioua ◽  
Borjini Mohamad Naceur ◽  
Khaled Al-Salem
Keyword(s):  
Entropy Generation ◽  
Thermocapillary Convection ◽  
Numerical Study ◽  
Control Volume ◽  
Three Dimensional ◽  
Total Entropy ◽  
Dimensional Solution ◽  
Central Difference ◽  
Content Type ◽  
Linear Algebraic Equations

Purpose – The main purpose of this paper is to conduct on three-dimensional buoyancy and thermocapillary convection in an enclosure. Entropy generation is obtained from the calculated values of velocities and temperatures. Design/methodology/approach – As numerical method, the vorticity-vector potential formalism allows, in a three-dimensional configuration, the elimination of the pressure, which is a delicate term to treat. The control volume finite difference method is used to discretize equations. The central-difference scheme for treating convective terms and the fully implicit procedure to discretize the temporal derivatives are retained. The grid is uniform in all directions with additional nodes on boundaries. The successive relaxation iterating scheme is used to solve the resulting non-linear algebraic equations. Findings – Results are presented via entropy generation due to heat transfer, entropy generation due to fluid friction and total entropy generation. It is found that Marangoni number becomes more effective parameter on total entropy generation for lower values of Rayleigh numbers. Practical implications – In any thermal system under buoyancy induced and thermocapillary flow. Originality/value – It is believed that this is the first paper on three-dimensional solution of entropy generation in a cubical cavity under thermocapillary buoyancy flow.

Numerical Study of Marangoni: Thermocapillary Convection Influence During Boiling Heat Transfer in Minichannels

2008 ◽  
Author(s):  
Cristina Radulescu ◽  
Anthony J. Robinson
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Thermocapillary Convection ◽  
Numerical Study ◽  
Cross Flow ◽  
Reynolds Numbers ◽  
Fully Developed Flow ◽  
Convection Problem ◽  
The Subject ◽  
Stationary Bubble

Marangoni thermocapillary convection and its contribution to heat transfer during boiling has been the subject of some debate in the open literature. Currently, for certain conditions, such as microgravity boiling, is being shown that has a significant contribution to heat transfer [1]. Typically, this phenomenon is investigated for the idealized case of an isolated and stationary bubble resting atop a heated solid which is immersed in a semi-infinite quiescent fluid or within a two-dimensional cavity. However, little information is available with regard to Marangoni heat transfer in miniature confined channels in the presence of a cross flow. As a result, this paper presents a numerical study that investigates the influence of steady thermal Marangoni convection on the fluid dynamics and heat transfer around a bubble during laminar flow of water in a minichannel with the view of developing a refined understanding of boiling heat transfer for such a configuration. This mixed convection problem is investigated for channel Reynolds numbers in the range of 0 ≤Re ≤500 and Marangoni numbers in the range of 0 ≤ Ma ≤ 17114. The influence of the thermocapillary flow is most pronounced for low Re and high Ma numbers showing an average of 40% increase in heat transfer. For low Ma and high Re inertial effects dominate and the thermocapillary effect is not as noticeable. However, the disruption of the fully developed flow does tend to enhance the heat transfer at the expense of additional pressure drop.

Experimental and numerical study of anomalous thermocapillary convection in liquid gallium

1999 ◽  
Vol 11 (11) ◽  
pp. 3331-3339 ◽  
Author(s):  
Janis Priede ◽  
Andreas Cramer ◽  
Andris Bojarevics ◽  
Alexander Yu. Gelfgat ◽  
Pinhas Z. Bar-Yoseph ◽  
...  
Keyword(s):  
Thermocapillary Convection ◽  
Numerical Study ◽  
Liquid Gallium

scholarly journals Instability of a Two-layer System with Deformable Interfaces under Laser Beam Heating

2019 ◽  
pp. 543-550
Author(s):  
Victoria B. Bekezhanova ◽  
Olga N. Goncharova ◽  
Natalia A. Ivanova ◽  
Denis S. Klyuev
Keyword(s):  
Free Boundary ◽  
Laser Beam ◽  
Thermocapillary Convection ◽  
Silicone Oil ◽  
Numerical Study ◽  
Theoretical Data ◽  
Thermal Exposure ◽  
Local Heat ◽  
Layer System ◽  
Standard Problem

New non-standard problem of thermocapillary convection is studied to analyze the flows arising in a two- layer system under action of an intense thermal exposure on the free boundary by a laser beam. Char- acteristics of the physical experiments are presented. Parameters of the experiments are the ratio of the liquid layer thicknesses, the types of working liquids, the absorption coefficients of media. Special atten- tion is given to the study of the influence of the system geometry when changing the thickness for one of the liquid layers. Theoretical study of the thermocapillary convection includes development of the mathe- matical model tested on the basis of new physical experiment data and of the effective numerical algorithm to calculate basic characteristics. The occurrence of the decaying oscillations, which first experimentally discovered by the authors, and the evolution of the interfaces and layers are investigated. The results of numerical study of structure and nature of convective flows in the horizontal two-layer liquid – liquid systems of the type "silicone oil – glycerin", and comparison of the experimental and theoretical data allow one to validate the developed mathematical model, to analyze the peculiarities of heat and mass transfer in the two-layer system induced by the action of a local heat source at the free boundary

A Numerical Study of Effect of Liquid Encapsulation on Thermocapillary Convection in Liquid Bridge

2004 ◽  
Author(s):  
Lan Peng ◽  
Dan-Ling Zeng ◽  
You-Rong Li
Keyword(s):  
Numerical Simulation ◽  
Crystal Growth ◽  
Liquid Bridge ◽  
Function Method ◽  
Thermocapillary Convection ◽  
Numerical Study ◽  
Flow Profile ◽  
Float Zone ◽  
Physical And Mathematical Models

The physical and mathematical models of the thermocapillary convection in liquid bridge with liquid encapsulation are established in the present paper. A numerical simulation of the thermocapillary convection in liquid bridge with liquid encapsulation is performed by employed vorticity-stream function method and the Alternative Direction Implicit scheme in finite difference. The distribution of temperature and flow in liquid columns is then obtained. It is verified that liquid encapsulation can reduce the thermocapillary convection in liquid bridge and can improve the quality of crystal growth in float zone. The influence law of the thickness of liquid encapsulation on the thermocapillary convection in liquid bridge is obtained, the more thickness of liquid encapsulation decreases, the more the thermocapillary convection in the inner liquid and the outer liquid diminishes. It is found that the flow profile of two liquid columns is much more complex than that of single liquid column.

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