Numerical and Experimental Investigation of the Dynamics of a Single Bubble Adjacent to a Flat Plate and a Cylindrical Rod with Varying Radii | Chapter 7 | Contemporary Perspective on Science, Technology and Research Vol. 4

In this work, we investigated the dynamics of a single cavitation bubble near a solid cylindrical rod with five different radii and a cylindrical rod with infinite radius (called here as flat plate) at different relative wall distances. First, we simulated dynamics of the cavitation bubble near a flat plate using a fully compressible model and validated the results with our experimental data. Second, we analyzed the effects of three relative wall distances (different γRB the effects of different radii (different γCR) of cylindrical rod on the bubble dynamics. Finally, we compared the bubble dynamics near a cylindrical rod and the flat plate at different relative wall distances and under effects of various radii of cylindrical rod. The results showed that the continuous enhancement of the cylindrical rod’s radius can affect the bubble collapse dynamics. In addition, the value of the wall pressure at the flat plate condition was about 1.9 MPa which is slightly lower than the value of the impact pressure at the condition of γCR = 8:0 with the value of 2.1 MPa. Through the comparison of the jet velocity evolution at different conditions of  γCR , it was found that the jet velocity at the conditions γCR = 0:5 and γCR = 1:0 can be reached it’s highest value at both relative wall distances of γRB = 0:6 and γ RB = 0:9. Furthermore, a similar evolution process of the jet velocity was obtained for the conditions γCR = 4:0; 6:0; 8:0 at both relative wall distances of γRB 0:6 and γRB = 0:9 compared to the flat plate condition. For a radius of cylindrical rods six times larger than bubble maximum radius, similar collapse dynamics for the rod and flat plate were observed.

Author(s) Details:

Ebrahim Kadivar,
Institute of Ship Technology, Ocean Engineering and Transport Systems, University of Duisburg-Essen, 47057 Duisburg, Germany and Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.

Thanh-Hoang Phan,
School of Mechanical Engineering, Pusan National University, Busan 46241, South Korea.

Warn-Gyu Park,
School of Mechanical Engineering, Pusan National University, Busan 46241, South Korea.

Ould el Moctar,
Institute of Ship Technology, Ocean Engineering and Transport Systems, University of Duisburg-Essen, 47057 Duisburg, Germany.

Please see the link here: https://stm.bookpi.org/CPSTR-V4/article/view/13140