Marangoni instability of a liquid layer with insoluble surfactant under heat flux modulation

2013 ◽  
Vol 219 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Alexander B. Mikishev ◽  
Alexander A. Nepomnyashchy
Keyword(s):  
Heat Flux ◽  
Liquid Layer ◽  
Marangoni Instability ◽  
Insoluble Surfactant ◽  
Flux Modulation

Thermocapillary instability of a liquid layer under heat flux modulation

2009 ◽  
Vol 21 (6) ◽  
pp. 062102 ◽  
Author(s):  
B. L. Smorodin ◽  
A. B. Mikishev ◽  
A. A. Nepomnyashchy ◽  
B. I. Myznikova
Keyword(s):  
Heat Flux ◽  
Liquid Layer ◽  
Thermocapillary Instability ◽  
Flux Modulation

Onset of Benard-Marangoni Instability on a Flat Meniscus in a Microchannel

2012 ◽  
Author(s):  
Zhenhai Pan ◽  
Hao Wang
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Temperature Gradient ◽  
Liquid Layer ◽  
Marangoni Number ◽  
Numerical Study ◽  
Marangoni Flow ◽  
Thin Liquid Layer ◽  
Marangoni Instability

Attention Marangoni instability in a microchannel is of interest in various heat transfer and microfluidic applications. In this work, a numerical study is conducted on a flat meniscus in a square adiabatic microchannel. The evaporative heat flux is uniform, and thus the initial meniscus temperature is uniform. However, the simulations showed that a temperature gradient perpendicular to the meniscus can also lead to an instability that starts a strong Marangoni flow, which should be a type of the Benard-Marangoni instability that was originally observed on a thin liquid layer. A new expression of the Marangoni number (Ma) is derived for the Benard-Marangoni instability in a microchannel. The threshold Ma values are obtained, providing guidance for microfluidic design.

Study on Subcooled-Forced Flow Boiling Heat Transfer and Critical Heat Flux of Solid-Water Two-Phase Mixture

1999 ◽  
Author(s):  
Yasuo Koizumi ◽  
Hiroyasu Ohtake ◽  
Manabu Mochizuki
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Critical Heat Flux ◽  
Liquid Layer ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Nucleate Boiling ◽  
Forced Flow ◽  
Superheated Liquid ◽  
Flow Boiling Heat Transfer

Abstract The effect of solid particle introduction on subcooled-forced flow boiling heat transfer and a critical heat flux was examined experimentally. In the experiment, glass beads of 0.6 mm diameter were mixed in subcooled water. Experiments were conducted in a range of the subcooling of 40 K, a velocity of 0.17–6.7 m/s, a volumetric particle ratio of 0–17%. When particles were introduced, the growth of a superheated liquid layer near a heat trasnsfer surface seemed to be suppressed and the onset of nucleate boiling was delayed. The particles promoted the condensation of bubbles on the heat transfer surface, which shifted the initiation of a net vapor generation to a high heat flux region. Boiling heat trasnfer was augmented by the particle introduction. The suppression of the growth of the superheated liquid layer and the promotion of bubble condensation and dissipation by the particles seemed to contribute that heat transfer augmentation. The wall superheat at the critical heat flux was elevated by the particle introduction and the critical heat flux itself was also enhanced. However, the degree of the critical heat flux improvement was not drastic.

Sign in / Sign up

Export Citation Format

Share Document