Analysis of Existing Equations for Calculating the Settling Velocity
Round 1
Reviewer 1 Report
General comment: I find this manuscript entitled “Analysis of Existing Equations for Calculating the Settling Velocity” trying to address the relevant issue and the findings are interesting. I would suggest this manuscript needs a major revision and this work can be accepted if the following corrections are made:
Comment
- Abstract should have statement about the research gap and focus of current study. Please revisit for better highlighting.
- English language need to be revised thoroughly throughout the manuscript to avoid errors. Introduction section needs to be strengthened with suggested cites: https://doi.org/10.1080/15715124.2017.1394318 ; http://www.jmaterenvironsci.com/Document/vol7/vol7_N3/94-JMES-2040-2015-Mishra.pdf ; https://doi.org/10.1007/s13201-020-01331-y ; https://doi.org/10.1007/s10668-020-00744-8 ; https://doi.org/10.1016/j.eti.2021.101405
- Discussion section needs revision. Interpretate each data. What is revealed from the analysed data. Explain reason of variation in related parameters data. Refer to the related articles available in literature and strengthen discussion
- Resolution of figures needs to be improved for better visibility to readers. Text in figures are not readable
- Conclusion should be reasonable. Modify and rewrite.
Comments for author File: 
Comments.docx
Author Response
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Reviewer 2 Report
The manuscript reviewed fourteen existing equations is for settling velocity of particles and compared the simulation results of these methods by graphical and statistical analysis. The topic is interesting. But the method review and comparison need to be improved with detail introduction, discussion or evaluation. Please see the specified comments:
- Now the authors listed 14 equations. It is necessary to add some details, such as background of theory, empirical or physical type, advantage and disadvantage, application limitations, and so on. These information is important for readers to choose the proper method.
- It is not enough to guild readers to the appropriate equation by the statistical comparison alone. Each method was proposed in a specific background, so it has different advantage and applicability. Some methods are easy to use with less parameters, some are good for low settling velocity or large particle size, some are in high precision but difficult to obtain parameters. So it is better to supplement in-deep evaluations of accuracy and applicability, combining with the statistical analysis.
- Please define the variable when it firstly appears. Such as “Sf” in line 57, Dgr in line 80, F in 73, …
- Line 75, “with different diameter range”, what range? Please clearly specify the range or the application limitation of this equation.
- Line 104, “Sf is the safe factor”, it is hard to know what does the safe factor indicate. So it needs more detail about this factor.
- Lines 196-215 are the method introduction of statistical performance analysis. It is suggested to move forward to method section.
Author Response
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Author Response File: Author Response.docx
Reviewer 3 Report
Manuscript Number: water-1273144-peer-review-v1
Title: Analysis of Existing Equations for Calculating the Settling Velocity
Brief summary:
In this paper, extensive data on settling velocity is collected from the literature and previously proposed equations are analyzed using graphical and statistical analysis.
Broad comments
The subject studied is interesting. However, the paper must be improved to meet the minimum journal requirements.
- The novelty of the presented topic is low.
- The content provided by the paper has an average significance.
- The methods and results are not adequately described.
- The discussion is very poor.
- The quality of the presentation is low.
- Scientific Soundness is low.
- The interest of the readers is average.
- The overall merit of the article is low.
- Extensive editing of English language and style required.
Author Response
Please see the attachment
Author Response File: Author Response.docx
