Evaporation of a thin viscous liquid film sheared by gas in a microchannel

Yu Kabova, V. V. Kuznetsov, O. Kabov, T. Gambaryan-Roisman, P. Stephan

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

In the present paper a 3D non-stationary two-sided mathematical model of joint motion of evaporating liquid film and cocurrent gas flow in a microchannel with local heating has been developed. This model takes into account a deformable gas-liquid interface, convective heat transfer in the liquid and the gas phases as well as temperature dependence of surface tension and liquid viscosity. Assuming the lubrication theory to be valid, the problem has been reduced to five governing equations for the film thickness, temperature fields in the gas and liquid, vapor concentration in the gas phase and gas pressure. Numerically it is shown that for films sheared by gas in microchannels vapor is transported by forced convection and diffusion, and diffusion plays the most considerable role in vapor transport at low gas velocities. Also, it is shown that concentration and thermal boundary layers are formed. The boundary layers have a specific S-shaped form. The width of the vapor track increases along the gas flow direction in front of the heater and decreases downstream the heater. The distance over which the width decreases is an order of magnitude higher than the heater length. This fact can be explained by the condensation of the vapor.

Original languageEnglish
Pages (from-to)527-541
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Volume68
DOIs
Publication statusPublished - 2014

Fingerprint

Liquid films
microchannels
Microchannels
Evaporation
Gases
evaporation
vapors
heaters
Vapors
liquids
gases
gas flow
vapor phases
Flow of gases
thermal boundary layer
Boundary layers
Liquids
forced convection
convective heat transfer
lubrication

Keywords

  • Deformable gas-liquid interface
  • Evaporation
  • Liquid film
  • Local heat source
  • Numerical investigation
  • Thermocapillarity

ASJC Scopus subject areas

  • Mechanical Engineering
  • Condensed Matter Physics
  • Fluid Flow and Transfer Processes

Cite this

Evaporation of a thin viscous liquid film sheared by gas in a microchannel. / Kabova, Yu; Kuznetsov, V. V.; Kabov, O.; Gambaryan-Roisman, T.; Stephan, P.

In: International Journal of Heat and Mass Transfer, Vol. 68, 2014, p. 527-541.

Research output: Contribution to journalArticle

Kabova, Yu ; Kuznetsov, V. V. ; Kabov, O. ; Gambaryan-Roisman, T. ; Stephan, P. / Evaporation of a thin viscous liquid film sheared by gas in a microchannel. In: International Journal of Heat and Mass Transfer. 2014 ; Vol. 68. pp. 527-541.
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