首页|Accurate characterization of bubble mixing uniformity in a circular region using computational geometric theory

Accurate characterization of bubble mixing uniformity in a circular region using computational geometric theory

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The present study proposes a novel method based on the geometric theory for measuring the distri-bution of bubble swarms in the circular region of a direct-contact heat exchanger.It was determined that the mixing is uniform when the average distance between the bubble swarms in the unit circular region is approximately 0.9054,which is the standard reference value.The effect of sample size(i.e.,the number of bubbles)on mixing uniformity was investigated to determine the optimal sample size.It was verified that the metric's accuracy and stability were higher with a sample size of 155.Accordingly,it was proposed to increase the sample size by filling irregular bubbles using a segmentation method,which enabled a further accurate assessment of the mixing uniformity.The mixing uniformity of bubble swarms in the circular region and its maximum internal connection with the square region was accu-rately quantified.It was revealed that the relative average error increased by approximately 3.47％due to information loss.The proposed method was demonstrated to be rotationally invariant.The present study provided novel insights into evaluating mixing uniformity,which would guide enhanced heat transfer and the effective evaluation of the spatiotemporal characteristics of transient mixing in circular regions or the cross-sections of chemical transport pipelines.

Direct-contact heat exchangerCircular regionBubble swarmDistribution uniformityAD-Circle method

Hui Sun、Jianxin Xu、Shibo Wang、Guangcheng Cai、Hua Wang、Wuliang Yin

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State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming,650093,China

Faulty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming,650093,China

Faculty of Science,Kunming University of Science and Technology,Kunming,650500,China

Department of Elec.and Electronic Engineering,University of Manchester,Manchester,M13 9PL,UK

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National Natural Science Foundation of ChinaYunnan Major Scientific and Technological ProjectsScientific Research Fund Project of Yunnan Education Department,ChinaNatural science Foundation of Yunnan Province,Chinateaching projects A Quality Course for Graduate Students in Yunnan ProvinceAdvanced Mathematics Teaching Team of Engineering Subjects of Kunming University of Science and Technology

52166004202202AG0500022021J0063202101AU070031

2024

10.1016/j.partic.2023.05.005

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.86(3)
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