Boiling Ndcleation of Mixtures on Smooth and Enhanced Surfaces

Shakir, S.; Thome, John R.

doi:10.1615/ihtc8.4060

Cited by 11 publications

(3 citation statements)

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“…(4) Fig. 8 also shows the calculated by the IHS model assuming the contact angle is 25°, as reported in literature for methanol-copper combination (Shakir and Thome, 1986), and three different value. No data on the exact value for methanol-copper combination can be found in literature.…”

Section: The Effect Of Heater Size ( ) Geometry and Fluid-surface Comentioning

confidence: 70%

Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots

Zhao

Williams

2018

International Journal of Multiphase Flow

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Section: The Effect Of Heater Size ( ) Geometry and Fluid-surface Comentioning

confidence: 70%

Predicting the critical heat flux in pool boiling based on hydrodynamic instability induced irreversible hot spots

Zhao

Williams

2018

International Journal of Multiphase Flow

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“…Contact angle at the time of bubble inception is assumed as (öincep = 90) follows [21,50]. During the process of bubble growth at nucleation cavity, contact angle decreases with increase in bubble radius.…”

Section: (25)mentioning

confidence: 99%

Simplified Model for Prediction of Bubble Growth at Nucleation Site in Microchannels

Kadam

Baghel

Kumar

2014

Journal of Heat Transfer

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Formation of the first bubble at nucieation site is an inception of the two phase flow in pool boiling and flow boiling. Bubble dynamics (bubble nucieation, growth, and departure) plays an important role in heat transfer and pressure drop characteristics during rv,'o phase flow in microchanneis. In this paper, a simplified model has been developed for predicting bubble growth rate at nucieation cavity in microchannel. It is assumed that heat supplied at nucieation site is divided between the liquid phase and the vapor phase as per instantaneous void fraction value. The energy consumed by the vapor phase is utilized in bubble growth and overcoming resistive effects; surface tension, inertia, shear, gravity, and change in momentum due to evaporation. Proposed model shows a good agreement with available experimental works. In addition, the bubble waiting time phenomenon for flow boiling is also addressed using proposed model. Waiting time predicted by the model is also close to that obtained from experimental data.

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“…The other benefit of reentrant cavities in enhanced boiling surfaces is their reduced susceptibility to vapor nucleus collapse when subjected to 50 heat transfer engineering subcooling, which make start-up easier to accomplish and also lowers the start-up wall superheat required. Shakir and Thome [8] have experimentally studied the activation and deactivation of boiling on a smooth copper tube and a copper High Flux tube for the mixture systems ethanol/water, n-propanol/water, and methanol/water at 1.01 bar while Ali and Thome [5] have reported results for ethanol/benzene mixtures. Depending on the mixture composition, the wall superheat required to initiate boiling on the plain tube was observed to be much higher than on the High Flux tube under the same conditions, 30 K instead of 3.5 K for instance .…”

Section: Boiling Nucleation Superheatmentioning

confidence: 99%