Transport phenomena in the thin-film region of a micro-channel

Park, Kyoungwoo; Noh, Kwan-Joong; Lee, Kwan-Soo

doi:10.1016/s0017-9310(02)00541-0

Cited by 95 publications

(85 citation statements)

References 8 publications

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“…The decrease in disjoining pressure causes liquid to be pumped into the thin film. When the superheat is increased, evaporation is strengthened and more liquid needs to be pumped into the thin film, decreasing the disjoining pressure faster and finally resulting in a larger apparent contact angle, which is consistent with previous studies [6][7][8][9]. Also as seen in Table 2(b), the contribution of the thin film to the overall heat transfer is increased.…”

Section: Superheatsupporting

confidence: 90%

“…The meniscus is superheated, and vapor space is assumed to consist of pure saturated vapor. The present model complements previous studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16] in three ways. First, heat transfer in the thin-film and micro regions is quantitatively compared and the relative contributions of the two regions to the overall heat transfer delineated.…”

Section: Introductionsupporting

confidence: 81%

“…The equations governing the thin-film profile have been extensively discussed in the literature [3][4][5][6][7][8][9] and are briefly reviewed here. The pressure difference between vapor and liquid at the liquid-vapor interface is due both to the capillary and disjoining pressures, and is expressed using the augmented Young-Laplace equation [4]:…”

Section: Thin-film Profilementioning

confidence: 99%

“…The model is often simplified in the literature by assuming a value of zero for δ' [6][7][8][9]. This term is retained in the present work to better model the beginning of the intrinsic meniscus where the slope may not be negligible.…”

Section: Thin-film Profilementioning

confidence: 99%

“…The influence of superheat on the thin film profile was discussed. Park et al [8] proposed a mathematical model which included the vapor region and a slip boundary condition. It was concluded that the pressure gradient in the vapor region significantly affected the thin-film profile.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Characteristics of an evaporating thin film in a microchannel

Wang

Garimella

Murthy

2007

International Journal of Heat and Mass Transfer

334

210

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An evaporating meniscus in a microchannel is investigated through an augmented Young-Laplace model and the kinetic theory-based expression for mass transport across a liquid-vapor interface. The complete expression for mass transport is employed without any approximations and boundary conditions for the film profile are developed. The thin-film and the intrinsic-meniscus regions are distinguished based on the disjoining pressure variation along the meniscus. While heat transfer in the thin-film region is found to be relatively insensitive to channels larger than a few micrometers in radius, that in the intrinsic meniscus is quite sensitive to channel size. The role of evaporation suppression due to capillary pressure in both regions is discussed. Compared to the relatively small contribution to overall heat transfer from the thin-film region, the micro region (defined here as extending from the non-evaporating region to a location where the film is 1 m thick) is found to account for more than 50% of the total heat transfer.

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Section: Superheatsupporting

confidence: 90%

Section: Introductionsupporting

confidence: 81%

Section: Thin-film Profilementioning

confidence: 99%

Section: Thin-film Profilementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Characteristics of an evaporating thin film in a microchannel

Wang

Garimella

Murthy

2007

International Journal of Heat and Mass Transfer

334

210

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Slip and micro flow characteristics near a wall of evaporating thin films in a micro channel

Zhao

Peng

Duan

2010

Heat Trans. Asian Res.

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The microscopic liquid flow and heat transfer characteristics near the solidliquid interface in the evaporating thin film region of a mini channel were investigated based on the augmented Young-Laplace equation and kinetic theory. A physical model using the boundary layer approximation and a constant slip length was developed to obtain the solid-liquid interfacial thermal resistances and interfacial temperatures. The results show that the ordered micro layer and micro flow near the wall reduce the effective liquid superheat and the liquid pressure difference mainly due to the reduced capillary pressure gradient. The solid-liquid interfacial thermal resistances and U-shaped temperature drops tend to reduce the thin film spreading and heat transfer. The effects of the solid-liquid interfacial thermal resistances on the thin film evaporation outweigh the effects of the thermal conductivity enhancement due to the liquid ordering. The concepts of the micro flow and ordered adsorbed flowing micro layer are clarified to express the Kapitza resistance analytically in terms of the slip length and micro layer thickness.

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Thermal Analysis of Nanofluids on the Thin Film Evaporation of Meniscus

Chen

Lin

2015

Heat Trans. Asian Res.

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A mathematical model for predicting evaporation in the thin film region was developed and its analytical solutions were obtained for thin-film thickness, the heat transport per unit length and the total heat flux transport in the thin-film region. These analytical solutions show that the higher heat flux through the thin film region occurs due to the higher superheat. The maximum evaporative rate occurs when the effects of the increase in the temperature difference ΔT = T w − T s and in the thin film thickness on the heat flux q stay equal. A nanofluid, which is a colloidal mixture of nanoparticles (1 nm to 100 nm) and a base liquid (nanoparticle fluid suspensions), is employed as the working fluid. In a certain range, increasing the volume fraction of nanoparticles in the base fluid leads to decreasing the kinematic viscosity of the nanofluid and increasing the thermal conductivity, which influences the evaporation in the thin film region. The heat transfer rate per unit length and the total heat flux in the thin film region display various characteristics among the different type of nanofluids due to the differences of the kinematic viscosity and the thermal conductivity. C⃝

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Transport phenomena in the thin-film region of a micro-channel

Cited by 95 publications

References 8 publications

Characteristics of an evaporating thin film in a microchannel

Characteristics of an evaporating thin film in a microchannel

Slip and micro flow characteristics near a wall of evaporating thin films in a micro channel

Thermal Analysis of Nanofluids on the Thin Film Evaporation of Meniscus

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