The Influence of Pre-Lift Gate Opening on the Internal and External Flow Characteristics During the Startup Process of an Axial Flow Pump
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsReviewer's Comments
Paper ID: Processes-3160945
Title: The Influence of Pre-Lift Gate Opening on the Internal and External
Flow Characteristics During the Startup Process of an Axial Flow Pump
The authors have explored an in-depth analysis of the axial flow pump. The article's presentation style is good. However, the reviewer made the following observations. Authors are informed to check for these comments.
Comments:
1. The authors must detail the solver settings, residuals, and convergence criteria presented in the numerical study.
2. In Fig. 1, what is the meaning of "Import"?
3. In Fig. 3, the Y axis is "H", not "H/m". Even though the author understands that "m" refers to the unit of H, the presented notation confuses the readers. It is better to avoid the usage of "/" and can write as "H (m)" for better clarity.
4. Mention the variation in H when the number of grid cells is increased from point 4 to point 5.
5. On what basis did the authors choose the RNG k-epsilon model? Do they find it through reported literature?
6. Fig. 1 and Fig. 4 look similar. As far as possible, duplication may be avoided.
7. On page No. 5, Lines 151 and 152 may be removed.
8. Fig. 5(b) – In the Y-axis, H is to be written as H (m) and in the X-axis, Q (m3/s) is to be written.
9. For experimentations, uncertainty analysis is a must. Please provide it.
10. The conclusion is weak as it is written more generically. Quantify the results briefly in the conclusion section.
Author Response
Please see the attachment.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsPlease find my comments in the pdf attached below.
Comments for author File: Comments.pdf
Please find my comments in the pdf attached below.
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsGENERAL COMMENTS
The present paper analyzes the Influence of Pre-Lift Gate Opening on the Internal and External Flow Characteristics During the Startup Process of an Axial Flow Pump. The content of the paper is good for publication. Nevertheless, there are some revisions that need to be addressed:
1. I am looking for the novelty of this paper. The originality of the paper needs to be stated clearly. It is imperative to have sufficient results to justify the novelty of a high-quality journal paper. The Introduction should make a compelling case for why the study is useful along with a clear statement of its novelty or originality by providing relevant information and providing answers to basic questions such as: What is already known in the open literature? What is missing. What needs to be done, why and how?
2. The literature review is not comprehensive given the many effects and should be improved by considering the related references:
3. The authors should read the entire manuscript multiple times with complete focus to maintain sentence consistency and, as a result, easy understanding for scientific readers from the previous sentence.
4. Authors should state the gap between previous study and present study in the introduction clearly!
5. Authors should explain the results of the study's comprehensively in the discussion! Presenting many figures and graphs of results without any scientific discussion is inadequate.
6. Authors should also compare their results to existing current literatures in every section and explain more clearly.
7. All the researched problems are treated superficially, especially in the methodological part. I suggest the authors to include some novel findings in this work.
8. The paper must be self-consistent. For this reason, the equations solved during the simulations must be included in the paper. These shall include the turbulence model and the model coefficients actually used.
9. I suggest the authors to justify why the turbulence model applied has been selected in this research work.
10. Authors should provide the Reynolds number of the turbulent flow.
11. Are the grids used sufficient to provide grid independent solutions for each case? Please comments.
12. Establishing grid convergence is a necessity in any numerical study. The presented grid independency study is a first approach. As the authors have already used different meshes, the reviewer would suggest to use these meshes and to apply the mentioned procedure to get an impression about the CGI value. Please provide this information here in the context of this chapter.
13. The boundary conditions used in the numerical approach should be extensively written.
14. The turbulence quantity and convergence criterion description should also be emphasized.
15. Regarding Figure 5, it is surprising that the authors deliver results of the efficiency of the graph without giving the expression that was used.
16. How the efficiency has been exactly defined here? Is it based on the first law or on the second law of thermodynamic or does it correspond to the one used from experiment? Please include in the paper.
17. I suggest the authors to include the experimental uncertainties. Are experimental data with respect to the flow field available?
18. The typesetting of formulas and the quality of the figures should be improved.
19. Authors should check the references for uniformity. Note that the references should be updated with the journal's format.
20. The conclusion should be written extensively in a descriptive and enumerative way. Authors should capture the salient points.
Comments on the Quality of English Language
Moderate
Author Response
Please see the attachment.
Author Response File: Author Response.pdf
Round 2
Reviewer 2 Report
Comments and Suggestions for AuthorsI thank the authors for incoporating my comments in their revised manuscript. Now, I recommend the publication of this manuscript.
