A study visualizing the collapse of vapor bubbles in a subcooled pool

Tang, Jiguo; Yan, Changqi; Sun, Licheng

doi:10.1016/j.ijheatmasstransfer.2015.04.090

Cited by 62 publications

(24 citation statements)

References 30 publications

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“…Obtained high‐speed videos were processed with an image processing procedure programmed by MATLAB. The bubble volume was estimated based on the processed images with the method of discrete integral,

V_{b} = K^{3} \sum_{j \in normalΩ} \frac{1}{4} π d_{j}^{2}

where K is a scale factor for converting the image unit into an actual value.…”

Section: Experimental Systemmentioning

confidence: 99%

“…The uncertainty of vapor volume mainly arises from the resolution of the recorded snapshots, bubble recognition procedure and the irregular shape of the vapor film, with a total uncertainty of about 9%. More detailed information on image processing procedure and uncertainty analysis of bubble parameters has been introduced in detail in our previous work …”

Section: Experimental Systemmentioning

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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V_{b} = K^{3} \sum_{j \in normalΩ} \frac{1}{4} π d_{j}^{2}

where K is a scale factor for converting the image unit into an actual value.…”

Section: Experimental Systemmentioning

confidence: 99%

Section: Experimental Systemmentioning

confidence: 99%

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

Tang

Sun

et al. 2019

AIChE Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…The uncertainty of bubble radius is 3% approximately. The detailed information on image processing procedure and uncertainty analysis of bubble parameters has been introduced in our previous work 25 …”

Section: Experimental Systemmentioning

confidence: 99%

Continuous formation of microbubbles during partial coalescence of bubbles from a submerged capillary nozzle

et al. 2020

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Bubble formation from a downward‐pointing capillary nozzle was investigated in this study. The experiments were conducted at gas flow rate of 40–5,400 ml/h and inner nozzle radius of 0.030–0.255 mm. Experimental results show that microbubbles are formed continuously at moderate Weber number, which was not reported in pervious investigations with injecting gas through an upward‐pointing capillary nozzle. High‐speed visualization indicates that the formation of microbubbles arises from the convergence of the capillary waves induced by the partial coalescence of larger bubbles. A bubbling regime map is given to identify the critical conditions for the formation of microbubbles. In the present air‐water experiments, the generated microbubbles are 20–170 μm in diameter. From experimental data, a scaling law for microbubble size is proposed as a function of Weber and Bond numbers.

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“…Numerical simulation of natural convection in autoclave has been performed by Yoshio et al [5]. Furthermore, bubbles usually appear in the boiling solution of hydrothermal reactions, and the high energy water jets and shock waves resulted from bubble collapse have been reported [7,13,14]. However, combination of convective flows and water jets to form vortex flows during hydrothermal reactions has not been found, elsewhere.…”

Section: Growth Mechanism Of Flower-like Ni-co Coatingmentioning

confidence: 99%

Vortex induced flower-like Ni-Co coating by a hydrothermal approach

2017

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A study visualizing the collapse of vapor bubbles in a subcooled pool

Cited by 62 publications

References 30 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

Continuous formation of microbubbles during partial coalescence of bubbles from a submerged capillary nozzle

Vortex induced flower-like Ni-Co coating by a hydrothermal approach

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