Fluid flow and heat transfer in the evaporating thin film region

B., H.; Cheng, Peng; Borgmeyer, B.; Wang, Y. X.

doi:10.1007/s10404-007-0172-5

Cited by 85 publications

(50 citation statements)

References 11 publications

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“…As the heat flux imposed on the thin film region increases, the evaporation and heat transfer rates through the evaporating thin film also increase [28]. More information on the mechanisms of heat transfer in capillary assisted grooved tubes can be found elsewhere [22,27,[29][30][31].…”

Section: Capillary-assisted Evaporationmentioning

confidence: 97%

Performance of finned tubes used in low-pressure capillary-assisted evaporator of adsorption cooling system

Thimmaiah

Sharafian

Huttema

et al. 2016

Applied Thermal Engineering

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Section: Capillary-assisted Evaporationmentioning

confidence: 97%

Performance of finned tubes used in low-pressure capillary-assisted evaporator of adsorption cooling system

Thimmaiah

Sharafian

Huttema

et al. 2016

Applied Thermal Engineering

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“…As early as 1972, Potash and Wayner (1972) expanded the Derjaguin-LandauVerwey-Overbeek (DLVO) theory (Derjaguin and Zorin 1956) to describe evaporation and fluid flow from an extended meniscus. Following this work, extensive investigations (Wayner et al 1976;Moosman and Homsy 1980;Holm and Goplen 1979;Mirzamoghadam and Catton 1988;Burelbach et al 1988;Stephan and Busse 1993;Ma and Peterson 1997;Demsky and Ma 2004;Ma et al 2008) have been conducted to further understand mechanisms of fluid flow coupled with evaporating heat transfer in thin film region. In this section, the disjoining pressure is introduced first, then the pressure across the liquid-vapor interface is tracked followed by a discussion of thin film profile, interface temperature, and heat transfer through the thin film region.…”

Section: Thin Film Evaporationmentioning

confidence: 99%

“…Using the procedure described above (Ma et al 2008), the governing equation shown in Eq. (2.217) can be solved with boundary condition shown in Eq.…”

Section: Momentum Conservation Modelmentioning

confidence: 99%

Fundamentals

Ma¹

2015

Oscillating Heat Pipes

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The liquid-vapor interface controlled by the surface tension and meniscus radius plays an important role in fluid flow and heat transfer of a heat pipe. In this chapter, the surface tension will be first introduced from three points of view: physical phenomenon, molecular dynamics, and thermodynamics, respectively. The temperature effect on the surface tension will be discussed and its relationship to the Marangoni flow. When the liquid-vapor interface has a curved surface, a pressure difference across the interface exists. This pressure difference can be predicted by the Laplace-Young equation, which will be addressed including the derivation processes and the origin of the capillary force in a heat pipe. The equilibrium vapor pressure of a liquid will be presented including the effects of meniscus radius and electric field on saturation pressure. When the meniscus radius of a bubble decreases, saturation pressure decreases, which can be used to explain the capillary condensation phenomenon. The contact angle, which significantly affects the capillary force, evaporation, and condensation in a heat pipe, will be discussed including the effects of temperature and surface roughness. Following this, advancing and receding contact angles will be addressed including the velocity effect. Finally, this chapter will cover primary factors affecting thin film evaporation which plays a key role in a heat pipe. The goal of this chapter is to provide the fundamentals related to interface surface, surface tension, contact angle, and phase change heat transfer occurring in heat pipes. Surface TensionWhen liquid flows down in a vertical capillary tube, as shown in Fig. 2.1, a small drop with an almost round shape starts to form and hang from the lower end of the capillary tube. This pendant suspended from the lower end of the capillary caused

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“…Chakraborty and Som (2005), in a more recent study, linked the rate of evaporation from the free surface of the thin liquid film into a medium of air and water vapor maintained throughout at a temperature below the saturation temperature corresponding to its existing pressure with the vapor phase mass diffusion. Ma et al (2007), in another recent investigation, developed a detailed model to determine the effects of inertial force, interfacial thermal resistance, surface tension, and disjoining pressure on the thin film profile, interfacial temperature variation, fluid flow, and the local heat transfer rates. Wang et al (2007) investigated an evaporating meniscus in a microchannel through an augmented Young-Laplace equation, by employing a kinetic theory based expression for mass transfer across the liquid-vapor interface.…”

Section: Introductionmentioning

confidence: 99%

Thin film evaporation in microchannels with interfacial slip

Biswal

Som

Chakraborty

2010

Microfluid Nanofluid

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We investigate the role of interfacial slip on evaporation of a thin liquid film in a microfluidic channel. The effective slip mechanism is attributed to the formation of a depleted layer adhering to the substrate-fluid interface, either in a continuum or in a rarefied gas regime, as a consequence of intricate hydrophobic interactions in the narrow confinement. We appeal to the fundamental principles of conservation in relating the evaporation mechanisms with fluid flow and heat transfer over interfacial scales. We obtain semi-analytical solutions of the pertinent governing equations, with coupled heat and mass transfer boundary conditions at the liquid-vapor interface. We observe that a general consequence of interfacial slip is to elongate the liquid film, thereby leading to a film thickening effect. Thicker liquid films, in turn, result in lower heat transfer rates from the wall to liquid film, and consequently lower mass transfer rates from the liquid film to the vapor phase. Nevertheless, the total mass of evaporation (or equivalently, the net heat transfer) turns out to be higher in case of interfacial slip due to the longer film length. We also develop significant physical insights on the implications of the relative thickness of the depleted layer with reference to characteristic length scales of the microfluidic channel on the evaporation process, under combined influences of the capillary pressure, disjoining pressure, and the driving temperature differential for the interfacial transport.

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Fluid flow and heat transfer in the evaporating thin film region

Cited by 85 publications

References 11 publications

Performance of finned tubes used in low-pressure capillary-assisted evaporator of adsorption cooling system

Performance of finned tubes used in low-pressure capillary-assisted evaporator of adsorption cooling system

Fundamentals

Thin film evaporation in microchannels with interfacial slip

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