文献类型：期刊文献

英文题名：Cavitation bubble dynamics in a funnel-shaped tube

作者：Ren, Zibo[1];Li, Bo[2,3];Xu, Peng[1];Wakata, Yuki[4];Liu, Jing[4];Sun, Chao[4,5,6,7];Zuo, Zhigang[1];Liu, Shuhong[1]

第一作者：Ren, Zibo

通讯作者：Zuo, ZG[1];Liu, SH[1]

机构：[1]Tsinghua Univ, Dept Energy & Power Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China;[2]Beijing Union Univ, Coll Robot, Beijing 100020, Peoples R China;[3]Tsinghua Univ, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China;[4]Tsinghua Univ, Ctr Combust Energy, Dept Energy & Power Engn, Key Lab Thermal Sci & Power Engn,Minist Educ,Int J, Beijing, Peoples R China;[5]Univ Twente, MESA Inst, Phys Fluids Grp, NL-7500 AE Enschede, Netherlands;[6]Univ Twente, J M Burgers Ctr Fluid Dynam, NL-7500 AE Enschede, Netherlands;[7]Tsinghua Univ, Sch Aerosp Engn, Dept Engn Mech, Beijing 100084, Peoples R China

第一机构：Tsinghua Univ, Dept Energy & Power Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China

通讯机构：[1]corresponding author), Tsinghua Univ, Dept Energy & Power Engn, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China.

年份：2022

卷号：34

期号：9

外文期刊名：PHYSICS OF FLUIDS

收录：;EI(收录号：20224112862342);Scopus(收录号：2-s2.0-85139395665);WOS:【SCI-EXPANDED(收录号:WOS:000860326300006)】；

基金：The authors gratefully acknowledge technical support from Y. Guo and L. Qin. This work was partially supported by the National Natural Science Foundation of China (Nos. 52079066 and 52076120), the State Key Laboratory of Hydroscience and Engineering (Nos. 2019-KY-04, sklhse-2019-E-02, sklhse-2020-E03 and 2020-KY-01), the Creative Seed Fund of Shanxi Research Institute for Clean Energy, Tsinghua University, the Academic Research Projects of Beijing Union University (No. ZK90202108), the R&D Program of Beijing Municipal Education Commission (No. KM202211417011), the National Experimental Teaching Demonstration Center for Power Engineering and Engineering Thermophysics, Tsinghua University, and the Experiments for Space Exploration Program and the Qian Xuesen Laboratory, China Academy of Space Technology (No. TKTSPY-2020-01-03).

语种：英文

摘要：Control of cavitation in confining geometries is vital to the safety of hydraulic conduits and structures. Here, we investigate cavitation bubble dynamics in one typical type of open-ended tube with varying cross sections, i.e., a funnel-shaped tube, defined as a funnel-shaped section connected to a cylindrical section. In our experiments, single cavitation bubbles are generated by spark along the symmetric axis of the funnel-shaped tube at different positions, including in the funnel-shaped section (regime 1), near the throat (regime 2), and in the cylindrical section (regime 3). With high-speed photography, we observe that at the end of collapse, bubbles produce weak jets in regime 1, jets in a shape of an inverted cone in regime 2, and jets in a cylindrical shape with a rounded end in regime 3. With the help of OpenFOAM simulation, we better understand the surrounding flow fields during the bubble evolution. By capturing the main features of the flow fields, we derive dynamics equations for bubbles in each regime. Scaling laws are proposed for the bubble jet velocity, which depends on the position of bubble generation, the inner diameter of the cylindrical section of the tube, and the maximum distance where the bubble's upper surface can reach before the collapse. Our findings may be inspiring for understanding cavitation bubble dynamics in tubular conduits with complex geometries, e.g., cavitation in pipelines and draft tubes in hydrodynamic systems, and ultrasonic diagnosis in blood vessels.