Study on Non-Spherical Deformation Velocity of a Single Cavitation Bubble

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

First of all, I would like to thank you very much for choosing our journal for your article. It is a very successful and meticulously prepared article. If you answer the questions I have asked, I would like to read the article again.

- Could you provide more details on the calibration process for the high-speed cameras and the laser system used in the experiment? How did you ensure that the synchronization between the camera and laser pulse was precise?

 

- In the context of the laser-induced single cavitation bubble study, how did you control and measure the exact energy delivered by the Nd:YAG laser to the water tank?

 

- You've described a method for full-field velocity calculation. Could you discuss the validation process for this calculation method and how you ensured its accuracy in capturing the bubble's motion?

 

- In the results section, you've outlined the observation of non-spherical deformation near different boundary types. Could you discuss the potential physical mechanisms or theories that explain why these specific deformations occur near each boundary type?

 

- The study notes significant variations in bubble collapse dynamics near different boundaries. How do these variations impact the practical applications of cavitation in engineering or medical fields?

 

- How did you address potential errors or biases in the measurement and analysis process, especially considering the high-speed nature of the phenomena being studied?

 

- How do the results of your study inform the design and optimization of systems utilizing cavitation, such as ultrasonic cleaning or medical therapies using cavitation bubbles?

 

- In order to provide more detailed information about the formation of bubbles and to improve the content of the article, please mention these two articles in detail in the introduction.

An experimental investigation of oil-water flow in a serpentine channel

https://doi.org/10.1016/j.ijmultiphaseflow.2020.103327

 

Plug flow of immiscible liquids with low viscosity ratio in serpentine microchannels

https://doi.org/10.1016/j.cej.2020.127933

 

- Can you elaborate on the process used to determine the stand-off distances (r) for the experiments near composite boundaries? What criteria were used to select these distances?

 

-  You mention that the bubble surface velocity was non-uniform and influenced by boundary conditions. Could you discuss the mathematical or computational models used to analyze and predict these velocity distributions?

- The study concludes significant effects of boundary proximity on bubble behavior. Could you elaborate on potential engineering or scientific applications where controlling the stand-off distance could be beneficial?

 

- Could you provide more details on the full-field velocity calculation technique mentioned? How was it validated for accuracy in capturing the complex dynamics of bubble collapse near composite boundaries?

 

- Based on the results of your study, what are the next steps in research to further explore the dynamics of cavitation bubbles near composite boundaries? Are there specific boundary configurations or conditions you plan to investigate?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

The manuscript investigates bubble deformation velocities focusing on the collapse behaviour of non-spherical bubbles near the boundary. Experimental data, including bubble pulsation processes and bubble surface velocity distributions, were obtained by high-speed videography and full-field measurement techniques. The content of this manuscript will meet the reading interests of the readers of the journal. However, there are figure illustration issues, and the discussion and explanation should be further improved. Therefore, I suggest giving a major revision and the authors need to clarify some issues or supply more validation data to enrich the content. 

Detailed comments can be found in the attached PDF.

Comments for author File: Comments.pdf

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 1 Report

Comments and Suggestions for Authors

Thank you for the changes you have made.

Reviewer 2 Report

Comments and Suggestions for Authors

The authors have improved and revised the contents based on the previous comments, and I consider the current version acceptable for possible publication.