Coupling of thermocapillary convection and evaporation effect in a liquid layer when the evaporating interface is open to air

Zhu, Zhiqiang; Liu, Qiusheng

doi:10.1007/s11434-009-0693-2

Cited by 21 publications

(12 citation statements)

References 19 publications

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“…The measurement indicated that the layer thickness decreased approximately linearly with time (Zhu and Liu 2010), which partly supported the hypothesis of quasi-stable evaporating condition in present experiments. Under the above quasi-stable condition, we performed the measurements as soon as possible, and the liquid layer thickness in one experiment was assumed to be approximately constant with the evaporation-induced decrease of 5 %.…”

Section: Experimental Setup and Measurement Techniquessupporting

confidence: 89%

“…Although the evaporating was also strengthened, synchronous enhancing thermocapillary flow could bring more heat energy to compensate the heat loss taken by evaporation. Eventually, the interfacial temperature was always higher in deeper liquid layer at center point (Zhu and Liu 2010). As we mentioned above, the temperature discontinuity was strongly related to the temperature at the liquid-vapor interface.…”

Section: Temperature Discontinuity Distribution Along the Center Linementioning

confidence: 73%

“…According to previous researches on the convective instability with an evaporating liquid-vapor interface, evaporation and thermocapillary convection were found to always couple with each other and co-influence the interfacial characteristics, such as interfacial temperature and pressure (Ji and Liu 2008;Zhu and Liu 2010). Actually, besides the temperature discontinuity across the liquid-vapor evaporating interface, Ward and co-workers (Duan and Ward 2005a, b;Duan et al 2005) also found the existence of the thermocapillary convection in the steady-evaporating water.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial Temperature Discontinuities in a Thin Liquid Layer during Evaporation

Zhu

Liu

2013

Microgravity Sci. Technol.

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Recent measurements of the temperature profiles across the liquid-vapor interface of a steady evaporating liquid were performed in a thin planar liquid layer subjected to externally imposed horizontal temperature differences when the interface was open to air. Temperature discontinuities have been found to exist at the interface with an growing tendency as the imposed horizontal temperature difference increasing. Under the co-influence of thermocapillary convection and evaporation effect, a thin layer of 0.5 mm thick with approximate uniform temperature was found just below the liquid-vapor interface. Repeated experiments and further comparisons of the interfacial temperature profiles for different spatial positions along the streamwise center line and varying depths of the liquid layer were also carried out. And the temperature discontinuity was found related to the temperature in liquid phase, which was strongly influenced by the coupling of thermocapillary convection and evaporation effect.

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Section: Experimental Setup and Measurement Techniquessupporting

confidence: 89%

Section: Temperature Discontinuity Distribution Along the Center Linementioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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Interfacial Temperature Discontinuities in a Thin Liquid Layer during Evaporation

Zhu

Liu

2013

Microgravity Sci. Technol.

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“…In both of these cases, evaporation is therefore at least somewhat balanced by condensation, and phase change occurs in the presence of air at ambient pressures. Zhu and Liu 16 instead studied convection in a L = 4 cm and W = 8 cm layer of 0.65 cSt silicone oil subject to ∆T ≤ 14 • C with an initial depth h = 0.2 cm where the interface was open to the surroundings.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the effect of noncondensables on buoyancy-thermocapillary convection in a volatile low-viscosity silicone oil

Grigoriev

Yoda

2014

Physics of Fluids

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The convective flow in a layer of volatile silicone oil with a kinematic viscosity of 0.65 cSt confined to a sealed cavity with a transverse aspect ratio of 3.2 was visualized using particle pathlines and quantified by particle-image velocimetry at dynamic Bond numbers estimated to be of order unity and laboratory Marangoni numbers as great as 3600. The effect of noncondensables (i.e., air) was studied by comparing convection in the liquid layer below a vapor space at pressures ranging from 4.8 kPa to 101 kPa, corresponding to air molar fractions ranging from 14% to 96%, respectively, and silicone-oil vapor, under otherwise identical conditions. The results for convection at 101 kPa are in qualitative agreement with previous studies, and clarify the time-dependent flow observed at high Marangoni numbers. The results show that decreasing the relative air concentration increases the critical Marangoni numbers for transition between different flow states, even though the air concentration does not appear to affect the speeds near the interface. Linear stability analysis shows that transitions are suppressed due to the latent heat generated or absorbed at the interface due to the enhancement of phase change. Furthermore, the experimental results suggest that air, even at relative concentrations as small as 14%, or partial pressures of O(10 2 Pa), has a significant effect on the vapor flow, and that the fluid in the vapor space should be modeled as a binary mixture in many cases of practical interest. C 2014 AIP Publishing LLC. [http://dx.

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“…f a c e t e m p e r a t u r e ( ℃ ) X ( m m ) P r e s e n t s i m u l a t i o n Z h u a n d L i u ( 2 0 1 0 ) Comparison of the surface temperature profile between the present numerical simulation and the experimental measurement by Zhu and Liu[41] …”

mentioning

confidence: 93%

Thermocapillary flow transition in an evaporating liquid layer in a heated cylindrical cell

Liu¹,

Chen²,

Ouazzani³

et al. 2020

International Journal of Heat and Mass Transfer

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Motived by recent ground-based and microgravity experiments investigating the interfacial dynamics of a volatile liquid (FC-72, P r = 12.34) contained in a heated cylindrical cell, we numerically study the thermocapillarydriven flow in such an evaporating liquid layer. Particular attention is given to the prediction of the transition of the axisymmetric flow to fully threedimensional patterns when the applied temperature increases. The numerical simulations rely on an improved one-sided model of evaporation by including heat and mass transfer through the gas phase via the heat transfer Biot number and the evaporative Biot number. We present the axisymmetric flow characteristics, show the variation of the transition points with these Biot numbers, and more importantly elucidate the twofold role of the latent heat of evaporation in the stability; evaporation not only destabilizes the flow but also stabilizes it, depending upon the place where the evaporationinduced thermal gradients come into play. We also show that buoyancy in the liquid layer has a stabilizing effect, though its effect is insignificant. At high Marangoni numbers, the numerical simulations revealed smaller-scale thermal patterns formed on the surface of a thinner evaporating layer, in qualitative agreement with experimental observations. The present work helps to gain a better understanding of the role of a phase change in the

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Coupling of thermocapillary convection and evaporation effect in a liquid layer when the evaporating interface is open to air

Cited by 21 publications

References 19 publications

Interfacial Temperature Discontinuities in a Thin Liquid Layer during Evaporation

Interfacial Temperature Discontinuities in a Thin Liquid Layer during Evaporation

Experimental study of the effect of noncondensables on buoyancy-thermocapillary convection in a volatile low-viscosity silicone oil

Thermocapillary flow transition in an evaporating liquid layer in a heated cylindrical cell

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