Experimental and Numerical Determination of Head Loss Coefficients of Two-Way Surcharged Manholes

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The energy loss coefficient of manholes was studied under different conditions, such as connected at angles of 180 °, 90 °, and 135 ° and when the ratio of manhole diameter to pipeline diameter is greater than 4. Experimental research was conducted using the most common types of flat, half-bench, and full-bench manholes. All manhole geometries generated in the experimental study were analyzed using the Ansys FLUENT program and the results were compared. This research has practical significance and value. However, I have the following suggestions and the manuscript need a revision.

1.      The latest reference listed is from 2020. Please provide information on the research status in this field in 2021, 2022, and 2023.

2.      When comparing the experimental results with the literature, there is no explanation of the similarities or differences between the experimental conditions in the literature and those in the article. Therefore, it is necessary to provide an explanation of the basis for comparability.

3.      There is a significant difference between the experimental results in Table 1 and the numerical simulation results. It should be supplemented to explain the reasons for this difference. Which result is more valuable for reference in practical use? Is it more accurate to refer to experimental results than numerical simulation results?

Author Response

Thank you very much for taking the time to review this manuscript. The nice comments I have received from you are very valuable to me and have been very motivating for my work on this subject.

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

The research work evaluates the head loss coefficients and surcharged two-way manhole hydraulics by adjusting different parameters. Relationship between head loss coefficients and effluent flow discharge, benching floor arrangement and surcharge ratio was investigated in this study. The findings from this study are interesting. It will be interesting to experimentally evaluate the flow in manholes with 90 and 135 degree pipe connections based on the findings from this study.

The authors have done an excellent job of clearly laying out the research gap in literature and have come up with a neat experimental design. I recommend to publish this work in the current form.

Author Response

Thank you very much for taking the time to review this manuscript. The nice comments I have received from you are very valuable to me and have been very motivating for my work on this subject.