Comment on “Thermocapillary convection due to a stationary bubble” [Phys. Fluids 16, 3131 (2004)]

Ehud Yariv

doi:10.1063/1.1862212

Thermal and Concentrational Maragoni Convection at Liquid∕Air Bubble Interface

Journal of Applied Mechanics ◽

10.1115/1.1991866 ◽

2005 ◽

Vol 73 (1) ◽

pp. 66-71 ◽

Cited By ~ 13

Author(s):

Konstantin Kostarev ◽

Antonio Viviani ◽

Andrew Zuev

Keyword(s):

Surfactant Concentration ◽

Thermocapillary Convection ◽

Marangoni Convection ◽

Fluid Flows ◽

Stationary Flow ◽

Horizontal Cylinder ◽

Interferometric Method ◽

Air Bubble ◽

Stable Temperature ◽

Stationary Bubble

The paper presents the experimental study of thermo- and solutocapillary Marangoni convection around a gas bubble in an inhomogeneous fluid with a vertical thermal or surfactant concentration gradient. The stationary bubble in the form of a short horizontal cylinder with a free lateral surface was placed into a vertically oriented thin liquid layer (Hele-Shaw cell). The evolution of thermal and concentration fields and fluid flows was studied applying the interferometric method. In contrast to a thermocapillary convection representing a stationary flow and stable temperature distribution, the periodic concentration disturbances around the bubble were observed in the solutocapillary case. The regularities of the discovered effect were revealed, and its interpretation was proposed.

Download Full-text

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

ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels ◽

10.1115/icnmm2008-62244 ◽

2008 ◽

Cited By ~ 2

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.

Download Full-text