Interfacial instability of a condensing vapor bubble in a subcooled liquid

Ueno, Ichiro; Ando, Jun; Koiwa, Y.; Saiki, Takahito; Kaneko, Toshihiro

doi:10.1140/epjst/e2015-02370-6

Cited by 17 publications

(7 citation statements)

References 12 publications

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“…This process is visually similar to the fission process of a collapsing bubble caused by Rayleigh–Taylor instability or re‐entrant jet collapse mechanism . However, Ueno et al found that the second derivative of bubble radius was negative for that of a bubble collapsing in highly subcooled liquid, which did not meet the general criterion of Rayleigh–Taylor instability . If increasing the liquid subcooling to 50 K, no obvious capillary surface waves could be detected any more from any viewing angles, as shown in Figure c.…”

Section: Resultsmentioning

confidence: 80%

“…First, it was found by Ueno et al that the sudden collapse of a vapor bubble always took place after emergence of capillary waves through experiments of vapor injection into subcooled liquid. The capillary waves could accelerate the condensation process and contribute to the collapse of vapor bubble and emission of microbubbles, which is one of important factors in MEB generation .…”

Section: Resultsmentioning

confidence: 99%

“…They found that the microbubbles were resulted from cavitation caused by collapse of vapor bubbles. Condensation process of a single vapor bubble in MEB was investigated by Ueno et al through injection vapor bubbles into a subcooled pool. It was found that the formation of fine surface waves caused by strong condensation across the interface could accelerate instability of bubble surface and cause the collapse of the vapor bubble.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Tang

Sun

et al. 2019

AIChE Journal

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This study investigated the transition from nucleate boiling to microbubble emission boiling (MEB) on a small heating surface under transient heating modes. During the short unstable boiling process after critical heat flux with a rapid increase in wall temperature, capillary waves were observed over the vapor film at subcooling of 30–40 K. The visualization results in this process demonstrated that the partial collapse of vapor film induced strong jet toward the heating surface and therefore avoided complete dryout thereon. This mechanism certainly plays an important role in the transition to stable MEB. Further comparison between the wall temperature and boiling states indicates that the wall temperature at onset point of stable MEB is determined by the predominance of MEB mode over film boiling in the transition process. Effects of liquid subcooling and surface oxidation on the transition process were also investigated at the same time.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Tang

Sun

et al. 2019

AIChE Journal

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“…Note that the frequency range of local liquid overheating is lower by more than an order of magnitude compared to intense capillary waves causing the violent emission of micrometer-sized bubbles from a condensing vapor bubble in the so-called microbubble emission boiling (MEB) regime. 55 , 62 – 64 …”

Section: Discussionmentioning

confidence: 99%

Single-bubble water boiling on small heater under Earth’s and low gravity

et al. 2018

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Today’s trends for enhancing boiling heat transfer in terrestrial and space applications focus on removal of bubbles to prevent formation of a vapor layer over the surface at high overheat. In contrast, this paper presents a new boiling regime that employs a vapor–air bubble residing on a small heater for minutes and driving cold water over the surface to provide high heat flux. Single-bubble boiling of water was investigated under normal gravity and low gravity in parabolic flights. Experiments demonstrated a negligible effect of gravity level on the rate of heat transfer from the heater. Due to self-adjustment of the bubble size, the heat flux provided by boiling rose linearly up with increasing heater temperature and was not affected by a gradually rising water temperature. The fast response and stable operation of single-bubble boiling over a broad range of temperatures pave the way for development of new devices to control heat transfer by forming surface domains with distinct thermal properties and wettability. The bubble lifetime can be adjusted by changing the water temperature. The ability of heating water on millimeter scales far above 100 °C without an autoclave or a powerful laser provides a new approach for processing of biomaterials and chemical reactions.

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“…Ueno et al [25] investigated experimentally the bubble collapse at low steam velocities in order to take into account only the condensation mechanisms, and suggested that that the collapse occurred once small disturbances arise on the bubble surface. Assuming a symmetrical bubble they found out that the bubble reached the maximum volume at first and then it start shrinking because of the enhancement of the condensation caused by the necking of the bubble and the abrupt shut off of steam injection.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Experimental study on steam chugging phenomenon in a vertical sparger

Gregu

Takahashi

Pellegrini

et al. 2017

International Journal of Multiphase Flow

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Unstable direct contact condensation called ``Chugging'’ that occurs in certain conditions in the pressure suppression pool of Primary Containment Vessel of Boiling Water Reactors (BWRs) was studied experimentally. The mechanisms of every phase of the chugging was described, and experimental results useful for the development and validation of more accurate CFD models were provided. The experiment was conducted with a transparent pool and a transparent polycarbonate pipe or a stainless steel pipe with inner diameter of 27 mm under the conditions of the steam mass flux of 5.5–19.5 kg/m2s and the pool temperature of 19–46.5 °C. Pressure pulses were measured and synchronized with a high speed video camera for images acquisition. It was identified that the bubble implosion occurred while the pressure in the bubble quickly decreased. This condition might establish instability in the interfacial area which grew abruptly causing the implosion. Moreover the transparent apparatus allowed to interpret and relate internal condensations, generating pressure spikes of around 1.2 MPa because of the condensation-induced water hammer. Finally, the chugging condensation regime map was created from the experimental data

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Interfacial instability of a condensing vapor bubble in a subcooled liquid

Cited by 17 publications

References 12 publications

Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Experimental investigation of transition process from nucleate boiling to microbubble emission boiling under transient heating modes

Single-bubble water boiling on small heater under Earth’s and low gravity

Experimental study on steam chugging phenomenon in a vertical sparger

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