Quantifying the synergy of bubble swarm patterns and heat transfer performance using computational homology

Huang, Junwei; Xu, Jianxin; Sang, Xiuli; Wang, Huitao; Wang, Hua

doi:10.1016/j.ijheatmasstransfer.2014.03.084

Cited by 36 publications

(23 citation statements)

References 23 publications

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“… 9 10 , Demidenko 14 , Huang et al . 5 and Fei et al . 6 , image analysis with advanced statistical methods (concerning mathematical knowledge), regarded as a normal practice, is gaining importance for object identification.…”

mentioning

confidence: 93%

“…Inspired and motivated by Huang et al . 5 , Demidenko 14 and Markou et al . 15 , statistical models for the gray images of the bubble swarm in a DCHE based on the gray scale distribution (or simply, gray distribution) are developed.…”

mentioning

confidence: 99%

“…The Betti numbers method was recently proposed to characterize the gas-liquid-solid three-phase mixing effects based on the reaction of CH 4 and ZnO with a molten salt system 4 . In terms of the bubbling regimes in direct contact heat exchanger (DCHE), Betti numbers can be used to estimate the number of bubbles aggregating in flow patterns and to obtain the pseudo-homogeneous time 5 . We concluded that bubble swarm images can be captured and processed advantageously due to image enhancement technology and mathematical methods 6 .…”

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confidence: 99%

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Quantifying the evolution of flow boiling bubbles by statistical testing and image analysis: toward a general model

Xiao

Wang

2016

Sci Rep

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A new index, the estimate of the error variance, which can be used to quantify the evolution of the flow patterns when multiphase components or tracers are difficultly distinguishable, was proposed. The homogeneity degree of the luminance space distribution behind the viewing windows in the direct contact boiling heat transfer process was explored. With image analysis and a linear statistical model, the F-test of the statistical analysis was used to test whether the light was uniform, and a non-linear method was used to determine the direction and position of a fixed source light. The experimental results showed that the inflection point of the new index was approximately equal to the mixing time. The new index has been popularized and applied to a multiphase macro mixing process by top blowing in a stirred tank. Moreover, a general quantifying model was introduced for demonstrating the relationship between the flow patterns of the bubble swarms and heat transfer. The results can be applied to investigate other mixing processes that are very difficult to recognize the target.

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confidence: 93%

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confidence: 99%

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confidence: 99%

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Quantifying the evolution of flow boiling bubbles by statistical testing and image analysis: toward a general model

Xiao

Wang

2016

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“…Due to the complexity of the multiphase flow in exchangers, the heat exchange performance has often been expressed in terms of the volumetric heat transfer coefficient [3]. Huang et al (2014) reported that homogeneous regime is one of the basic bubbling regimes in DCHE but less likely to prevail industrially owing to the high gas flow rates employed. This favors the heterogeneous bubbling regime characterized by a wide range of bubble sizes and considerable frequencies of breakage and coalescence [4].…”

Section: Introductionmentioning

confidence: 99%

“…This favors the heterogeneous bubbling regime characterized by a wide range of bubble sizes and considerable frequencies of breakage and coalescence [4]. Furthermore, the bubble uniformity and mixing efficiency are quantities related to the direct-contact heat transfer coefficient in the light of computational homology [5]. It was found that the direct-contact heat transfer performance was not only about the number of bubble swarms which could be characterized by Betti numbers, but it was all about the spatial-time location of bubble swarms because aggregate was considered to be related to the specific surface area [6].…”

Section: Introductionmentioning

confidence: 99%

Measure of bubble non-uniformity within circular region in a direct-contact heat exchanger

Xiao

Pan

et al. 2017

International Journal of Heat and Mass Transfer

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The study of bubble swarm distributions in a direct-contact heat exchanger was addressed both theoretically and experimentally. But recently developed approach based on uniform design for measuring bubbles uniformity and mixing efficiency within rectangular or square region can not be used to characterise the mixture homogeneity and mixing time within circular region. This paper discussed the difference between rectangular or square region and circular region. A quantitative metric of mixing uniformity is used to characterize the bubble patterns within circular region. Simulation studies are also used to illustrate the proposed methodologies while the experimental case considered demonstrate that the proposed approach evaluated the experimental data rather well. The space-time features of the mixing transient have been successfully derived when the bubble swarms or other objects distribute in a circular region. This work brings new insights to evaluate mixing quality of different systems practically, which has a high degree of accuracy (the percentage of enhancing achieved is about 40%).

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Direct‐Contact Heat Transfer during n‐Pentane Vaporization in a Two‐Dimensional Water Column

Wang

2020

Chem Eng & Technol

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Direct‐contact vaporization heat transfer is investigated by analyzing the heat transfer coefficient with the area of liquid‐liquid direct‐contact interface. The interface areas of liquid‐liquid heat transfer are determined by stroboscopic images. At higher temperature, the heat transfer area per unit volume decreases. The water temperature has no significant influence on the heat transfer coefficient. The effects on droplet size distributions of operating variables including inlet water temperature, n‐pentane flow rate, and test position with packing and without packing are compared.

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Quantifying the synergy of bubble swarm patterns and heat transfer performance using computational homology

Cited by 36 publications

References 23 publications

Quantifying the evolution of flow boiling bubbles by statistical testing and image analysis: toward a general model

Quantifying the evolution of flow boiling bubbles by statistical testing and image analysis: toward a general model

Measure of bubble non-uniformity within circular region in a direct-contact heat exchanger

Direct‐Contact Heat Transfer during n‐Pentane Vaporization in a Two‐Dimensional Water Column

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