Numerical Study of the Emission of Acoustic Energy of Single Collapsing Vapor Bubble Near a Rigid Wall
Round 1
Reviewer 1 Report
This paper estimates the variation of acoustic energy in the flow field during the bubble collapse phase under the conditions of different values of γ (the ratio of the distance between the wall and the initial bubble center to the maximum radius of the bubble). With this aim, the open-source package OpenFOAM is used, and the OpenFOAM solver is modified to take the phase transition and heat transfer into account. The governing equations and specific implementation method are obtained. The simulation results are compared with the experimental results, and the influence of dimensionless bubble-wall distance on the acoustic energy in the flow field is discussed.
Some shortcoming and missing of the paper are the following:
- (Line 126): It should be kg/m3 instead of Kg/m3.
- Formula (10): In the left part of the equation, under sign of ln there is dimension parameter of pressure pv; in the right part of the equation there are dimensionless constants A, B, C and dimension parameter of T. What are the physical units of the left and right parts of Equation (10)? What is ground for selection of the used values of the constants A, B, C?
- (Line 152): It should be J/(kg K) instead of J/(Kg K).
Author Response
Please see the attachment.
Author Response File: 
Author Response.docx
Reviewer 2 Report
line 67 of single cavitation bubble under different γ: define γ, what it represents and what the dimensions are.
The formulas you write are actually used by the software, because you don't synthesize them and make it clear which formula is the most important and from which it is possible to understand the physics of the phenomenon you are studying.
Clarify your contribution exactly, since you are using open source software.
How did you perform the validity test of the procedure?
Did you run a test case?
Which?
line 191 and in the liquid, P∞, are initialized as 3540 Pa and 1 atm: for pressure use "atm" you must use the international system for pressure pascal (Pa). You should correct.
Define better: NCBMR values.
You should make it clear exactly what you want to do.
Explain the procedure better
You should make it clear if you have performed experimental tests and compared it to the numerical model, only in this way can the paper be valid.
Then highlight the comparison between real test and numerical model.
Author Response
Please see the attachment.
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
Classical Antoine equation is (see, https://en.wikipedia.org/wiki/Antoine_equation):
lg p = A – B/(C + T) or 0.43ln p = A – B/(C + T), so the revised Formula (10):
ln p = exp[A – B/(C + T)] is not right.
Reviewer 2 Report
accept
