On the effects of thermocapillary driven oscillations on bubble growth during boiling of FC-72 on a thin wire

Duursma, Gail; Jiang, Feng; Sefiane, Khellil; Duff, S.R.I.; Béji, H.

doi:10.1016/j.ijthermalsci.2011.01.020

Cited by 12 publications

(3 citation statements)

References 13 publications

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“…This movement was defined as bubble migration by Lee [19] and the measured velocity was about 2.5 cm/s. The slipping motion was also observed in normal gravity by Duursma et al [20], which could be explained by a micro-wedge model [21] (as shown schematically in Fig. 7).…”

Section: Bubbles' Behavior and Heater Wall Temperaturesupporting

confidence: 66%

Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity

Wang

Zhao

et al. 2016

Experimental Thermal and Fluid Science

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Experiments of highly subcooled nucleate pool boiling of FC-72 with dissolved air were conducted on a large scale silicon chip (2 Â 2 Â 0.05 cm 3 , denoted as chip S 2 Â 2) in short-term microgravity condition and normal gravity condition by utilizing the drop tower in Beijing respectively. The results were compared with published results of a smaller scale chip (1 Â 1 Â 0.05 cm 3 , denoted as chip S 1 Â 1) both in normal gravity condition and microgravity condition, to study the heater size effect on boiling heat transfer. It is indicated that in microgravity, the input heat flux range in which bubble departure took place for chip S 2 Â 2 is wider than that for chip S 1 Â 1, and an interesting phenomenon observed is that coalesced bubbles departed at a continuously smaller radii at a given heat flux. Initially, the average bubble departure radii for chip S 2 Â 2 increased linearly with heat flux while later remained constant. At a same heat flux, chip S 2 Â 2 showed a bubble departure radius larger than that of chip S 1 Â 1. By comparison, it is found that nucleate boiling performance deteriorates with increase in heater size in both earth gravity condition and microgravity condition. However, in microgravity the q CHF of chip S 2 Â 2 is 20% greater than that of chip S 1 Â 1, contrary to the CHF characteristic in earth ground condition. Moreover, boiling patterns in microgravity are different in high heat flux region: a smooth hemispherical bubble was generated on chip S 1 Â 1, while on chip S 2 Â 2 an oblate vapor blanket was formed, which indicates that different dominated boiling heat transfer mechanisms exist in both cases. It is found that in microgravity, the boiling was dominated by buoyancy for chip S 2 Â 2, but it was in surface tension dominated boiling regime for chip S 1 Â 1, which proved the above speculation. Moreover, the range of transition heater size criteria is 1:45 < L h Lc < 2:89 in the present work. By using the updated model developed by Raj and Kim, it is discovered that predicted values are generally lower than experimental values in both experiments. Moreover, differences were more evident for chip S 2 Â 2.

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Section: Bubbles' Behavior and Heater Wall Temperaturesupporting

confidence: 66%

Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity

Wang

Zhao

et al. 2016

Experimental Thermal and Fluid Science

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“…This bubble behavior is also observed by Lee (2002) and defined as bubble migration with a measured velocity of approximately 2.5 cm/s under conditions of high subcooling at low heat fluxes. Furthermore, in normal gravity, a slipping motion was also observed by Duursma et al (2011) for pool boiling of FC-72 on a thin wire. This motion may be caused by the capillary action in a thin liquid microlayer between the vapor bubble interface and the heater surface, also called micro-wedge model, as shown schematically in Fig.…”

Section: Resultsmentioning

confidence: 68%

Experimental Study of Nucleate Pool Boiling of FC-72 on Smooth Surface under Microgravity

Yang

Zhao

Wei

et al. 2011

Microgravity Sci. Technol.

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Experiments of highly subcooled nucleate pool boiling of FC-72 with dissolved air were studied both in short-term microgravity condition utilizing the drop tower Beijing and in normal gravity conditions. The bubble behavior and heat transfer of air-dissolved FC-72 on a small scale silicon chip (10 × 10 × 0.5 mm 3 ) were obtained at the bulk liquid subcooling of 41 K and nominal pressure of 102 kPa. The boiling heat transfer performance in low heat flux region in microgravity is similar to that in normal gravity condition, while vapor bubbles increase in size but little coalescence occurs among bubbles, and then forms a large bubble remains attached to the heater surface during the whole microgravity period. Thermocapillary convection may be an important mechanism of boiling heat transfer in this case. With further increasing in heat flux to the fully developed nucleate boiling region, the vapor bubbles number as well as their size significantly increase in microgravity. Rapid coalescence occurs among adjacent bubbles and then the coalesced large bubble can depart from the heating surface during the microgravity period. The reason of the large bubble departure is mainly attributed to the momentum effects caused by the coalescence of small bubbles with the large one. Hence, the steady-state pool boiling can still be ob- tained in microgravity. In the high heat flux regime near the critical heat flux, significant deterioration of heat transfer was observed, and a large coalesced bubble forms quickly and almost covers the whole heater surface, leading to the occurrence of the critical heat flux in microgravity condition.

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“…Although Wayner et al initially proposed the lack of heat transfer in the nonevaporating film, further research has revealed that the nonevaporating film can significantly affect the overall macroscopic heat transfer . Owing to the complex dynamics of bubbles and testing conditions, a few experiments ,− and molecular dynamics simulations − have addressed the formation and characteristics of the nonevaporating film.…”

mentioning

confidence: 99%

Overcoming the Heat Transfer Paradox: Nano Ridges Induce “Pistol Bubbles” and Reverse the Boiling Curve

Xu,

Ye,

et al. 2023

Nano Lett.

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To increase the boiling heat transfer limit, we disrupted the previously nonevaporating region and increased the vaporization activity of “inert” liquid molecules by introducing nano ridges on the boiling surface. This solved the paradox of no heat transfer occurring through the thinnest liquid film in boiling bubbles; thus, the internal heat transfer limit of the bubbles was exceeded. We found that vigorous boiling occurred immediately once the nonevaporating region was activated, and the bubble frequency increased by an order of magnitude, reaching 1186 Hz, which has not been previously reported. With an increase in heat flux, the boiling curve exhibited a “return”. We achieved an extremely high bubble frequency by experimentally quantifying the major influence of nonevaporating region disruption on boiling heat transfer. The mechanism behind the generation of the ultrahigh-frequency bubbles was discovered. This study also reveals a new mechanism for the reversed boiling curve.

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On the effects of thermocapillary driven oscillations on bubble growth during boiling of FC-72 on a thin wire

Cited by 12 publications

References 13 publications

Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity

Experimental study of the heater size effect on subcooled pool boiling heat transfer of FC-72 in microgravity

Experimental Study of Nucleate Pool Boiling of FC-72 on Smooth Surface under Microgravity

Overcoming the Heat Transfer Paradox: Nano Ridges Induce “Pistol Bubbles” and Reverse the Boiling Curve

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