High speed video recording of bubble formation with pool boiling

Luke, Andrea; Cheng, Da‐Chuan

doi:10.1016/j.ijthermalsci.2005.06.011

Cited by 17 publications

(3 citation statements)

References 16 publications

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“…In a relatively simple model, the following bubble nucleation quantities are usually considered in developing theoretical models to analyze heat transfer characteristics: average bubble departure diameter (D), average bubble departure frequency (f), and average active nucleation site density (N). Other researchers have utilized high-speed visualization in order to characterize bubble dynamics on plain surfaces and determine the contributions of the phase-change and single-phase convective heat ( [20][21][22], for example).…”

Section: Introductionmentioning

confidence: 99%

Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces

Thiagarajan

Yang

King

et al. 2015

International Journal of Heat and Mass Transfer

140

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a b s t r a c tNucleate pool boiling experiments were performed on microporous copper surfaces and plain surfaces using saturated HFE-7100 as the working fluid. Quantitative measurements of the bubble dynamics, such as the nucleation site density, bubble diameter at departure, and bubble departure frequency, were obtained using high-speed visualization. The microporous surfaces, with coating thicknesses in the range of 100-700 lm, porosity of 55-60%, and cavity sizes in the range of 0.5-5 lm, showed a significantly lower boiling incipience temperature, which enhanced the heat transfer coefficient by 50-270% and enhanced the critical heat fluxes by 33-60% when compared to the plain surface. At low heat flux levels, the surface with a thicker microporous coating showed better performance than the thinner one. However, the thinner microporous coating resulted in higher critical heat flux than the thicker surface. The site density, departure diameter, and departure frequency were compared against the predictions using various correlations from the literature. Based on a heat flux partition model, using the measured values of the active site density and bubble departure diameter and frequency, and neglecting the single-phase heat transfer effects of bubble coalescence, the individual modes of heat transfer (evaporative, quenching, and convective) were computed. Reasonably good agreement between the partition model results and the experimental data was obtained. On the plain surfaces, the evaporative and quenching components were approximately equal. On the microporous surfaces, the evaporative component was found to be significantly higher.

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Section: Introductionmentioning

confidence: 99%

Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces

Thiagarajan

Yang

King

et al. 2015

International Journal of Heat and Mass Transfer

140

View full text Add to dashboard Cite

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“…Among the various mechanisms taking place in the heat exchange process, the main three, namely evaporation, bubble agitation and quenching, require comprehensive knowledge of the bubble parameters for the model to succeed. Therefore, several secondary modelling processes are required to get accurate information about the bubble characteristic diameter, number of active sites present and bubble releasing frequency [ 30 , 31 , 32 ]. At the beginning, the manual process was slow and tedious, but current technology brings the opportunity for turning the bubble recognition into a mass and automatized process.…”

Section: Introductionmentioning

confidence: 99%

“…At the beginning, the manual process was slow and tedious, but current technology brings the opportunity for turning the bubble recognition into a mass and automatized process. In the last few years, many research papers have tackled bubble size measurement and tracking procedures by the use of high speed filming as a valuable aid even with some other techniques, such as the infrared thermometry [ 31 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ], ultrasound technologies [ 40 ] or particle image velocimetry [ 41 , 42 ]. However, only a few authors briefly explain the processing image steps [ 43 , 44 , 45 , 46 ], and almost none fully described the computational steps of the recognition process.…”

Section: Introductionmentioning

confidence: 99%

On the Application of Image Processing Methods for Bubble Recognition to the Study of Subcooled Flow Boiling of Water in Rectangular Channels

Paz

Conde

Porteiro

et al. 2017

Sensors

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This work introduces the use of machine vision in the massive bubble recognition process, which supports the validation of boiling models involving bubble dynamics, as well as nucleation frequency, active site density and size of the bubbles. The two algorithms presented are meant to be run employing quite standard images of the bubbling process, recorded in general-purpose boiling facilities. The recognition routines are easily adaptable to other facilities if a minimum number of precautions are taken in the setup and in the treatment of the information. Both the side and front projections of subcooled flow-boiling phenomenon over a plain plate are covered. Once all of the intended bubbles have been located in space and time, the proper post-process of the recorded data become capable of tracking each of the recognized bubbles, sketching their trajectories and size evolution, locating the nucleation sites, computing their diameters, and so on. After validating the algorithm’s output against the human eye and data from other researchers, machine vision systems have been demonstrated to be a very valuable option to successfully perform the recognition process, even though the optical analysis of bubbles has not been set as the main goal of the experimental facility.

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Wärmeübertragung bei der Verdampfung an mikro- und makrostrukturierten Rohren

Lukas

2023

Innovative Wärmetauscher

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High speed video recording of bubble formation with pool boiling

Cited by 17 publications

References 16 publications

Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces

Bubble dynamics and nucleate pool boiling heat transfer on microporous copper surfaces

On the Application of Image Processing Methods for Bubble Recognition to the Study of Subcooled Flow Boiling of Water in Rectangular Channels

Wärmeübertragung bei der Verdampfung an mikro- und makrostrukturierten Rohren

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