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Dynamic Analysis of Bubble Attachment and Sweeping on Microwire in Subcooled Nucleate Pool Boiling

Journal of Thermal Science 2021年第5期30卷 1842-1858页

作者： XU Nian JIANG Hantao PENG Licheng WANG Dongdong CHU Huaqiang School of Energy and Environment Anhui University of TechnologyMa'anshan 243002China College of Ecology and Environment Hainan UniversityHaikou 570228China Engineering Technology Research Center of Energy Saving&Pollutant Control in Metallurgical Process Anhui University of TechnologyMa'anshan 243002China

With the development of industrial technology,heat transfer at the microscale has attracted more and more *** this work,200μm platinum wire and 150μm nickel-chromium wire were used as experimental objects,which the power was provided by DC power with the range of 15.6 W to 56.2 *** water was used as the experimental *** bubbles on the micro wire were observed and the heat mechanism was analyzed.A variety of bubble attachment phenomena were captured on the 200μm platinum wire,including the adhesion during bubble detachment,the rotation of small attached bubbles on the surface of large bubble,multiple bubbles circling at the top of the same bubble,and different attached bubble departure *** force in the vertical direction triggered the formation of bubble *** addition,the effects of surface tension,adhesion force and buoyancy force on the circling of the bubble were also *** analysis of the bubble sweeping on the 150μm nickel-chromium wire was *** results showed that the static bubble would interact with the sweeping bubbles on the other side,thereby changing the heat transfer mechanism,which was not discussed in detail *** bubble jet flow generated by thermocapillary convection on the vertical direction of the bubble surface was the main influencing factor,which would change the microlayer encountered in front of the *** effects of bubble diameter and liquid subcooling on the sweeping velocity were also *** results showed that the larger the bubble diameter was,the lower the sweeping velocity would be achieved while the liquid subcooling temperature had less impact on the velocity of sweeping bubble.

关键词： nucleate boiling attachment sweeping marangoni force

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Surface Tension and Temperature Effect on Entrapment of Bubbles and Particles in Continuous Casting of Steel

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Journal of Iron and Steel Research International 2011年第S2期18卷 220-226页

作者： Sang-Min Lee Sang-Joon Kim Hae-Geon Lee Graduate Institute of Ferrous Technology Pohang University of Science and Technology 31 San Pohang kyoungbuk Korea

The entrapment behavior of Ar bubbles onto the solidifying front of molten steel in the continuous casting mold was investigated. The dynamic model of bubble and particle entrapment was developed in order to consider the effect of surface tension gradient induced forces(marangoni force) due to the gradient of sulfur concentration and temperature. The numerical analysis and water model experiment were performed to apply the present model for various conditions. The calculation result is compared with experimental results and plant data in continuous casting mold as well. It shows that the thermal marangoni force could play an important role and this model predicts the bubble behavior in the vicinity of solid/liquid interface more precisely.

关键词： bubble continuous casting surface tension gradient marangoni force

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