Image credits:
Dense suspension of finite-sizeprolate ellipsoids settling in
still fluid. Authors: X. Jiang,
C. Xu, L. Zhao
Flyer:
Click here to download.Confirmed Keynote Speakers
Professor Jianfu Zhao
Chinese Academy of Sciences (CHN)
Bubble dynamics in different gravity conditions aboard China space station
Abstract:
Due to large difference between the densities of the liquid and its vapour, bubble dynamics, flow structures and heat transfer performances of boiling in different gravity conditions exhibit distinct dif-ference. With the help of simulated gravity environment provided by the Variable Gravity Science Rack (VGR) in Wentian Lab Module of China Space Station (CSS), the project vgBOILING-CSS, one of the first batch of two scientific experiment tasks utilizing VGR, has been performed for study-ing bubble dynamics and heat transfer during nucleate pool boiling in the past one and a half years in a wide range of gravity levels from 2ge to the background microgravity environment aboard CSS. An abnormal gravity scaling behaviour, namely an enhancement rather than deterioration of the heat trans-fer with the decreasing gravity, has been discovered in the nucleate pool boiling region with low heat flux. The largest diameter of growing isolated bubble attached on the heating surface is found to be inversely proportional to gravity and proportional to the 0.3-power of the superheating. Different in-teractions among bubbles are also observed. The preliminary findings obtained from the project vgBOILING-CSS will be reported and discussed in the present lecture.
The present research is supported financially by the National Key R&D Program of China under the grant of 2022YFF0503502 and China Manned Space Engineering Program under the grant of YYWT0601EXP18.
Brief Bio:
Dr. Jian-Fu ZHAO received a Batchelor’s degree in Engineering Mechanics from Tsinghua University, Beijing, China in 1990, a Master’s degree in Fluid Mechanics from Zhejiang University, Hangzhou, China in 1993, and a PhD in Hydraulics and River Dynamics from Wuhan University of Hydraulic and Electric Engineering (presently Wuhan University), Wuhan, China in 1998. He was then a Post-Doc Researcher at National Microgravity Laboratory/CAS, Institute of Mechanics, Chinese Academy of Sciences from 1998 to 2000, after which he was an Assistant Professor (from September 2000), an Associate Professor (from January 2001), and a Full Professor (from January 2005) at Institute of Mechanics, Chinese Academy of Sciences. He was also a Visiting Professor from 2008 to 2014 at Sun Yat-sen University, Guangzhou, China. Presently, He is also a Professor at the University of the Chinese Academy of Sciences, Beijing, China, and a Visiting Professor at Qingdao University, Qingdao, China. His main research interests are focused the fundamental research of microgravity fluid physics and R&D of multiphase thermal fluid systems for space applications. He has involved closely in more than ten space experiment projects aboard the China Space Station Tiangong, the Chinese recoverable satellites RS-22/SJ-8/SJ-10, the Russia Space Station MIR, and so on. He also participated in related R&D tasks in several space missions such as Chang’E-3, Chang’E-5, SJ-20, and so on. He is currently a member of the Executive Council of the Chinese Society of Space Researches (CSSR) and the Chair-person of the Committee of Microgravity Science and Applied Research/CSSR, a member of Committees of relevant National Societies including CSTAM, CSET, CSA, CSM, and CSHST, an Associate Editor of Microgravity Science and Technology (Springer), and a member of 6 journals’ editorial boards.
Chinese Academy of Sciences (CHN)
Bubble dynamics in different gravity conditions aboard China space station
Abstract:
Due to large difference between the densities of the liquid and its vapour, bubble dynamics, flow structures and heat transfer performances of boiling in different gravity conditions exhibit distinct dif-ference. With the help of simulated gravity environment provided by the Variable Gravity Science Rack (VGR) in Wentian Lab Module of China Space Station (CSS), the project vgBOILING-CSS, one of the first batch of two scientific experiment tasks utilizing VGR, has been performed for study-ing bubble dynamics and heat transfer during nucleate pool boiling in the past one and a half years in a wide range of gravity levels from 2ge to the background microgravity environment aboard CSS. An abnormal gravity scaling behaviour, namely an enhancement rather than deterioration of the heat trans-fer with the decreasing gravity, has been discovered in the nucleate pool boiling region with low heat flux. The largest diameter of growing isolated bubble attached on the heating surface is found to be inversely proportional to gravity and proportional to the 0.3-power of the superheating. Different in-teractions among bubbles are also observed. The preliminary findings obtained from the project vgBOILING-CSS will be reported and discussed in the present lecture.
The present research is supported financially by the National Key R&D Program of China under the grant of 2022YFF0503502 and China Manned Space Engineering Program under the grant of YYWT0601EXP18.
Brief Bio:
Dr. Jian-Fu ZHAO received a Batchelor’s degree in Engineering Mechanics from Tsinghua University, Beijing, China in 1990, a Master’s degree in Fluid Mechanics from Zhejiang University, Hangzhou, China in 1993, and a PhD in Hydraulics and River Dynamics from Wuhan University of Hydraulic and Electric Engineering (presently Wuhan University), Wuhan, China in 1998. He was then a Post-Doc Researcher at National Microgravity Laboratory/CAS, Institute of Mechanics, Chinese Academy of Sciences from 1998 to 2000, after which he was an Assistant Professor (from September 2000), an Associate Professor (from January 2001), and a Full Professor (from January 2005) at Institute of Mechanics, Chinese Academy of Sciences. He was also a Visiting Professor from 2008 to 2014 at Sun Yat-sen University, Guangzhou, China. Presently, He is also a Professor at the University of the Chinese Academy of Sciences, Beijing, China, and a Visiting Professor at Qingdao University, Qingdao, China. His main research interests are focused the fundamental research of microgravity fluid physics and R&D of multiphase thermal fluid systems for space applications. He has involved closely in more than ten space experiment projects aboard the China Space Station Tiangong, the Chinese recoverable satellites RS-22/SJ-8/SJ-10, the Russia Space Station MIR, and so on. He also participated in related R&D tasks in several space missions such as Chang’E-3, Chang’E-5, SJ-20, and so on. He is currently a member of the Executive Council of the Chinese Society of Space Researches (CSSR) and the Chair-person of the Committee of Microgravity Science and Applied Research/CSSR, a member of Committees of relevant National Societies including CSTAM, CSET, CSA, CSM, and CSHST, an Associate Editor of Microgravity Science and Technology (Springer), and a member of 6 journals’ editorial boards.
