Numerical Simulation of Hydrogen Leakage and Diffusion Process of Fuel Cell Vehicle

Round 1

Reviewer 1 Report

The manuscript deals with the numerical simulation of hydrogen leakage from gas-tank of fuel cell vehicle. The results are clearly stated in the manuscript. There is a minor remark:

1). Abstract should contain the main conclusions of the research.

2). The numbers should be separated from the unit by a space: for example: page 1 line 40 – 0.9 m. Check all the text!

3). What are the boundary conditions of the described model?

4). In Figures 10-14 wind direction should be indicated.

5). How does the model take into account the distance from the vehicle to the vent?

I recommend this paper to be accepted for the publication with minor revision for .

Best regards, Reviewer

Author Response

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Author Response File: Author Response.docx

Reviewer 2 Report

1) The novelty of the work must be clearly addressed and discussed, compare your research with existing research findings and highlight novelty, (compare your work with existing research findings and highlight novelty)

2)The main objective of the work must be written on the more clear and more concise way at the end of introduction section

3)Introduction section must be written on more quality way, i.e. more up-to-date references addressed. Research gap should be delivered on more clear way with directed necessity for the conducted research work

4) The paper lacks a detailed analysis of the cited references, so the author should add analysis and discussion of some references.

5)Conclusion section is missing some perspective related to the future research work

Author Response

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Author Response File: Author Response.docx

Reviewer 3 Report

The paper tries to simulate the hydrogen leakage diffusion in HFCV using commercial simulator in open and closed spaces. 

1. The novelty of the paper is low. The authors are asked to improve significantly the contents and novelty of the study.
2. The English must be improved and corrected significantly. There are many grammatical and writing errors throughout the manuscript. 
3. The paper must be checked carefully by native or English-speaking scientists. 
4. Further references and literature studies are required. Describe sufficiently the differences of the current study with the previous studies or existing literature. 
5. The abstract must be rewritten. Include the methodology, quantitative and qualitative results, and brief discussion. 
6. Validity check must be performed to clarify the results of the simulation. 
7. Methodology provided in the manuscript is very basic and nothing new. These are standard governing equations provided by Fluent. You need to extend the theoretical approach to get the novelty. 

Author Response

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Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

I consider that the paper has been improved according to Reviewer’s recommendations. I recommend this paper to be accepted for the publication in Journal of “World Electric Vehicle Journal".

Author Response

The English style has been modified.

Reviewer 2 Report

Accept 

Author Response

The English style has been modified.

Reviewer 3 Report

The study tries to analyze the distribution range and concentration distribution characteristics of hydrogen in two spaces. By changing parameters and numerical simulation, the effects of leakage rate, wind speed, wind direction in open space and vent in closed space on hydrogen safety are discussed, which provides a reference for hydrogen safety of HFCV. The paper requires major and significant improvement and corrections. 1. In the abstract mention both quantitative and qualitative results. Therefore, the readers can understand and justify accurately the contents and results of the study more easily. 2. The English must be checked by the native scientist. Still many grammatical and writing errors. 3. In general, the novelty is still low. As you mentioned that you have validated the data, please provide the experimental works (including the apparatus, data, and analyses) conducted for validifying your models. 4. Mention all the mathematical models involved in your study. Equation 1 is insufficient. 5. Describe clearly Figure 1, including dimensions and other data. 6. You must extend your references and literature study, you are really lack of literature study. Improve and search many references correlated to the topics in several database. Below are several works which are strongly recommended. a. Dispersion characteristics of hydrogen leakage: Comparing the prediction model with the experiment. Energy 236 (2021) 121420 b. Liquid Hydrogen: A Review on Liquefaction, Storage, Transportation, and Safety. Energies 14 (18), 5917 c. Prediction of state property during hydrogen leaks from high-pressure hydrogen storage systems. International Journal of Hydrogen Energy 44 (2019) 22394-22404 d. Review of hydrogen safety during storage, transmission, and applications processes. Journal of Loss Prevention in the Process Industries 72 (2021) 104569

Author Response

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Author Response File: Author Response.docx

Round 3

Reviewer 3 Report

It's really hard for me to measure the efforts of the authors to revise the manuscript. 

The authors only answered generally to the raised questions/issues, and the revision in the manuscript has been done inadequately. 

The equations used are really common equations, and the validity is only comparing the simulation with another simulation, not with any practical experimental data.