Confined growth of a vapour bubble in a capillary tube at initially uniform superheat: Experiments and modelling

Kenning, D. B. R.; Wen, Dongsheng; Das, Kausik S.; Wilson, S. K.

doi:10.1016/j.ijheatmasstransfer.2006.04.010

Cited by 54 publications

(31 citation statements)

References 28 publications

(52 reference statements)

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“…4B). Although growth of confined bubbles in nanochannels has not yet been reported, the growth of confined vapor bubbles reported in larger microchannels typically does not exhibit a constant evaporation rate (13). Instead, the growth rate of confined vapor bubbles in microchannels is typically observed to increase with time, consistent with the momentum-governed bubble growth theory (13).…”

mentioning

confidence: 76%

Evaporation-induced cavitation in nanofluidic channels

Duan

Karnik

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

120

108

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Cavitation, known as the formation of vapor bubbles when liquids are under tension, is of great interest both in condensed matter science as well as in diverse applications such as botany, hydraulic engineering, and medicine. Although widely studied in bulk and microscale-confined liquids, cavitation in the nanoscale is generally believed to be energetically unfavorable and has never been experimentally demonstrated. Here we report evaporation-induced cavitation in water-filled hydrophilic nanochannels under enormous negative pressures up to −7 MPa. As opposed to receding menisci observed in microchannel evaporation, the menisci in nanochannels are pinned at the entrance while vapor bubbles form and expand inside. Evaporation in the channels is found to be aided by advective liquid transport, which leads to an evaporation rate that is an order of magnitude higher than that governed by Fickian vapor diffusion in macro-and microscale evaporation. The vapor bubbles also exhibit unusual motion as well as translational stability and symmetry, which occur because of a balance between two competing mass fluxes driven by thermocapillarity and evaporation. Our studies expand our understanding of cavitation and provide new insights for phase-change phenomena at the nanoscale.nanobubbles | confined fluids | confined water | bubble dynamics | bubble formation

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mentioning

confidence: 76%

Evaporation-induced cavitation in nanofluidic channels

Duan

Karnik

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

120

108

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“…These have been attributed to transient dryout, particularly at low mass flux, and relatively high heat flux. Kenning et al (2006) suggested that there are two different mechanisms of dryout around individual bubbles in microchannels. These are dryout as a result of depletion of the film thickness below a certain minimum by complete evaporation of the liquid film beneath the confined bubble and dryout due to surface tension driven ‗capillary roll-up' on partially-wetted surfaces with finite contact angles.…”

Section: Temperature and Pressure Fluctuationsmentioning

confidence: 99%

Flow Patterns and Heat Transfer for Flow Boiling in Small to Micro Diameter Tubes

Karayiannis

Shiferaw

Kenning

et al. 2010

Heat Transfer Engineering

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“…However, the liquid film thickness was given as a parameter in these models. Meanwhile, Kenning et al (17) proposed the confined growth model. They introduced the surface tension balance to calculate the pressure difference between the liquid and the vapor phase.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Evaporative Heat Transfer by Expansion Bubble in a Microchannel for High Heat Flux Cooling

Okajima

Komiya

Maruyama

2012

JTST

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The objectives of this study were to establish a theoretical model of the phase change heat transfer in a microchannel and to investigate the possibility of cooling under higher heat flux than the critical heat flux for nucleate boiling. A bubble expansion model including transient variation of the liquid film thickness was proposed. The heat transfer coefficient and wall superheat were calculated by proposed model. The validity of this model was evaluated by using cited experimental data. It was confirmed that the bubble length derived by this model was in good agreement with that data. In order to evaluate the heat transfer regime in a microchannel, the minimum wall superheat to initiate nucleate boiling was introduced, and the conditions to achieve perfect evaporative heat transfer in a microchannel under the critical heat flux were derived. The diameter of the microchannel where perfect evaporative heat transfer occurs is called the "boiling limit diameter". The boiling limit diameters of various fluids were calculated. The results clarified the influence of the surface tension on the phase change heat transfer in a microchannel. Furthermore, this result also indicated the possibility of high heat flux cooling with perfect evaporative heat transfer in a microchannel.

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Confined growth of a vapour bubble in a capillary tube at initially uniform superheat: Experiments and modelling

Cited by 54 publications

References 28 publications

Evaporation-induced cavitation in nanofluidic channels

Evaporation-induced cavitation in nanofluidic channels

Flow Patterns and Heat Transfer for Flow Boiling in Small to Micro Diameter Tubes

Analysis of Evaporative Heat Transfer by Expansion Bubble in a Microchannel for High Heat Flux Cooling

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