Heat up and evaporation of shear driven liquid wall films in hot turbulent air flow

Rosskamp, Heiko; Willmann, Michael; Wittig, Sigmar

doi:10.1016/s0142-727x(97)10021-2

Cited by 15 publications

(2 citation statements)

References 6 publications

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“…Motion of evaporated liquid film is widely studied experimentally as well. Rosskamp et al (1998) conducted experimental research of evaporating liquid wall films driven by shear force in hot turbulent air flow. The dynamics of a wave film under intensive evaporation was investigated by Pavlenko et al (2001).…”

Section: Introductionmentioning

confidence: 99%

Gravity effect on evaporation and interfacial deformations in nonisothermal liquid film moved by a gas flow in a microchannel

Kabova

Kuznetsov

Kabov³

2014

Interfac Phenom Heat Transfer

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In the present paper, we investigate evaporating locally heated thin liquid film driven by the action of gas flow in a microgap. A two-sided three-dimensional mathematical model is used. For a deformable gas-liquid interface, convection heat transfer in the liquid and the gas phases as well as temperature dependence of surface tension and liquid viscosity are taken into account. Interaction and balancing of different effects on the evaporation process along the gas-liquidinterface takes place. The influences of gravity force, the gas flow rate, and heating intensity on the evaporation rate and gas-liquid interface deformations have been investigated numerically using the developed model. It is shown that evaporation is governed substantially by the gravity and the relation is strongly nonlinear, which could be explained by smoothing of deformations at the gas-liquid interface with gravity changing. The qualitatively different effect of gas velocity on the evaporation rate has been found, depending on the thermal boundary condition on the heated substrate.

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Section: Introductionmentioning

confidence: 99%

Gravity effect on evaporation and interfacial deformations in nonisothermal liquid film moved by a gas flow in a microchannel

Kabova

Kuznetsov

Kabov³

2014

Interfac Phenom Heat Transfer

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“…Moreover, Wittig 1998). Moreover, studies of such liquid increasing performance demands have resulted films require precision measurements and in greater non-uniformity of on-chip power accurate models of the transition regimes dissipation, creating localized, sub-millimeter hot spots, often exceeding 1kW/cm 2 between macro and micro-scale that are in heat capable to predict formation of dry patches and flux, which can degrade the processor heat transfer in the micro-region near contact performance and reliability (Bar-Cohen and line and hence in the localized hot spots with Rahim 2007).…”

Section: Introductionmentioning

confidence: 99%

Rupture of a Locally Heated Liquid Film Driven by the Shear Stress of Gas and Gravity

Зайцев¹,

Kabob²,

Guo³

et al. 2010

AIP Conference Proceedings

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The paper focuses on the recent progress that has been achieved by the authors through conducting experiments with locally heated shear-driven and falling liquid films. Rupture of the liquid film was investigated and it was found that scenario of film rupture differs widely for different flow regimes. The critical heat flux is about 10 times higher for a shear driven film than that for a falling liquid film, and reaches 250 W/cm 2 in experiments with water at atmospheric pressure. Rupture of a subcooled falling liquid film heated from the substrate is preceded by the formation of steady state film surface deformations. The film spontaneously ruptures at the moment when the film thickness in the thinned region reaches a certain critical minimum independent of both the Reynolds number and the plate inclination angle (gravity force). By means of high speed imaging it is found that the process of rupture involves two stages: 1) abrupt film thinning down to a thin residual film; 2) rupture and dryout of the residual film. As the plate inclination angle is reduced the threshold heat flux required for film rupture weakly decreases, however when the angle becomes negative the threshold heat flux begins to rise dramatically, which is associated with an increase of the stabilizing hydrostatic effect due to the growth of the film thickness.

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Effect of Variable Liquid Properties on the Flow Structure within Shear-Driven Wall Films

Elsäßer¹,

Samenfink

Ebner

et al. 2000

Laser Techniques Applied to Fluid Mechanics

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Heat up and evaporation of shear driven liquid wall films in hot turbulent air flow

Cited by 15 publications

References 6 publications

Gravity effect on evaporation and interfacial deformations in nonisothermal liquid film moved by a gas flow in a microchannel

Gravity effect on evaporation and interfacial deformations in nonisothermal liquid film moved by a gas flow in a microchannel

Rupture of a Locally Heated Liquid Film Driven by the Shear Stress of Gas and Gravity

Effect of Variable Liquid Properties on the Flow Structure within Shear-Driven Wall Films

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