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

Liu, Wenjun; Chen, Paul G.; Ouazzani, Jalil; Liu, Qiusheng

doi:10.1016/j.ijheatmasstransfer.2020.119587

Cited by 13 publications

(3 citation statements)

References 47 publications

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“…Based on the constant Boit numbers of numerical simulations. Liu et al [20] found evaporation plays an opposing role in flow stability. Xu et al [21] further developed the numerical model to account for the convection of gas and proves that evaporation improves the stability of thermocapillary-buoyancy convection.…”

Section: Introductionmentioning

confidence: 99%

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Tao,

Liu,

Qin

et al. 2023

Microgravity Sci. Technol.

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Thermocapillary convection of nanofluid with evaporating phase change interface occurs in a variety of industrial processes such as micro/nano fabrication, ink-jet printing, and thin film coatings, etc. Previous studies have mostly focused on the phenomena of thermocapillary convection in pure fluids without phase change. This paper reports the first fundamental experimental work on thermocapillary flow of nanofluid thin liquid layer under effect of evaporation. This research focuses on the behavior of volatile thin nanofluid liquid layer in a rectangular test cell under the effects of horizontal temperature gradient. The buoyancy effect can be ignored inside this thin liquid layer, which is similar to the results in microgravity condition. HEE7200 and HFE7200-Al2O3 nanofluid are used as working fluid to analyze the effect of nanoparticles addition. The results indicate that the linear relationship between the thickness of the liquid layer and the duration of evaporation does not change by nanoparticles addition. HFE7200-Al2O3 nanofluid always has higher evaporation rate than its base fluid in the temperature difference range of 2.98 to 13.92℃. The critical Marangoni number for nanofluid is lower than that of pure fluid, which indicates that nanoparticles addition promotes the flow pattern transition.

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Section: Introductionmentioning

confidence: 99%

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Tao,

Liu,

Qin

et al. 2023

Microgravity Sci. Technol.

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“…Zahurul Islam and Ying Yin Tsui developed a quasi-3D model to simulate the flow in planar microfluidic devices [ 5 ]. Wenjun Liu et al [ 6 ] and Mohammadbar et al [ 7 ] used the numerical modeling of the evaporation from a liquid layer by considering the phenomena of heat and mass transfer. The kinetic aspects of the Marangoni phenomenon in viscous polymer solutions were investigated by Ye Tian et al [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Photothermocapillary Method for the Nondestructive Testing of Solid Materials and Thin Coatings

Zykov

Вавилов

Kuimova

2021

Sensors

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The photothermocapillary (PTC) effect is a deformation of the free surface of a thin liquid layer on a solid material that is caused by the dependence of the coefficient of surface tension on temperature. The PTC effect is highly sensitive to variations in the thermal conductivity of solids, and this is the basis for PTC techniques in the non-destructive testing of solid non-porous materials. These techniques analyze thermal conductivity and detect subsurface defects, evaluate the thickness of thin varnish-and-paint coatings (VPC), and detect air-filled voids between coatings and metal substrates. In this study, the PTC effect was excited by a “pumped” Helium-Neon laser, which provided the monochromatic light source that is required to produce optical interference patterns. The light of a small-diameter laser beam was reflected from a liquid surface, which was contoured by liquid capillary action and variations in the surface tension. A typical contour produces an interference pattern of concentric rings with a bright and wide outer ring. The minimal or maximal diameter of this pattern was designated as the PTC response. The PTC technique was evaluated to monitor the thickness of VPCs on thermally conductive solid materials. The same PTC technique has been used to measure the thickness of air-filled delaminations between a metal substrate and a coating.

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“…Thermocapillary flow is a type of Maragoni flow induced by the surface tension gradient, which is temperature dependent (Ellahi et al, 2016;Lappa, 2017). The liquid circulation in an evaporating liquid film is inherently interrupted attributed to the presence of a thermocapillary effect (Jiang and Zhou, 2019;Liu et al, 2020). The sign of the surface tension gradient is important in determining the fluid flow direction in an evaporating thin liquid film (Dong et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Inverse-thermocapillary evaporation in a thin liquid film of self-rewetting fluid

Lim

Kueh²,

Hung³

2020

HFF

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Purpose The present study aims to investigate the inverse-thermocapillary effect in an evaporating thin liquid film of self-rewetting fluid, which is a dilute aqueous solution (DAS) of long-chain alcohol. Design/methodology/approach A long-wave evolution model modified for self-rewetting fluids is used to study the inverse thermocapillary characteristics of an evaporating thin liquid film. The flow attributed to the inverse thermocapillary action is manifested through the streamline plots and the evaporative heat transfer characteristics are quantified and analyzed. Findings The thermocapillary flow induced by the negative surface tension gradient drives the liquid from a low-surface-tension (high temperature) region to a high-surface-tension (low temperature) region, retarding the liquid circulation and the evaporation strength. The positive surface tension gradients of self-rewetting fluids induce inverse-thermocapillary flow. The results of different working fluids, namely, water, heptanol and DAS of heptanol, are examined and compared. The thermocapillary characteristic of a working fluid is significantly affected by the sign of the surface tension gradient and the inverse effect is profound at a high excess temperature. The inverse thermocapillary effect significantly enhances evaporation rates. Originality/value The current investigation on the inverse thermocapillary effect in a self-rewetting evaporating thin film liquid has not been attempted previously. This study provides insights on the hydrodynamic and thermal characteristics of thermocapillary evaporation of self-rewetting liquid, which give rise to significant thermal enhancement of the microscale phase-change heat transfer devices.

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

Cited by 13 publications

References 47 publications

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Thermocapillary Convection of Evaporating Thin Nanofluid Layer in a Rectangular Cavity

Photothermocapillary Method for the Nondestructive Testing of Solid Materials and Thin Coatings

Inverse-thermocapillary evaporation in a thin liquid film of self-rewetting fluid

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