Numerical Study on Interfacial Structure and Mixing Characteristics in Converter Based on CLSVOF Method
and Baokuan Li 1
Round 1
Reviewer 1 Report
The authors present a relevant work in the field of purification of steel slag, promoting the carbon-oxygen reaction at the slag-steel interface and reduces iron content in the slag.
The authors mentioned in their work they have mentioned the Volume of Fluid method to describe the gas liquid interface and I would like to see in the introduction that speak about the employment of van Der Waals equation used to explain such equilibrium at the interface as explained in the paper https://doi.org/10.1103/PhysRevE.65.021110 and cite it as mention the relative improvement of vdW equation in the field of Bader´s theory citing https://doi.org/10.1007/s00214-018-2271-7.
Indeed as mentioned by the authors the Volume of Fluid (VOF) method has drawbacks and to overcome them it is preferred Coupled Level-Set and Volume of Fluid (CLSVOF) method, which combine VOF function to achieve mass conservation and capture interface smoothly by computing the curvature and normal vector using the Level-Set function.
Here they have showed as CLSVOF method was able to to analyse the mixing process under different injection flow rates and bottom-blowing positions.
The work was well presented albeit the English should be more carefully improved to make more understandable the manuscript.
The logical analysis of model was completely eviscerated and supported by results.
The manuscript after a carefully checking of English and as above mentioned the authors should add in the introduction a complete discussion of possibility to use van Der Waals equation to describe the gas-liquid phases.
After this minor review the manuscript should be accepted.
The English should be more carefully revised by native speaker. Please!
This will help to promote better your work.
Author Response
Response to Reviewer 1 Comments
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Numerical study on interfacial structure and mixing character-istics in converter based on CLSVOF method”.
We sincerely thank the reviewer for the time and effort spent evaluating our manuscript. We are very glad to have your positive feedback and especially appreciate the following professional questions and suggestions, which help us enhance the quality of the present work. Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. The detailed point-by-point responses to the comments are listed below:
Point 1: The authors present a relevant work in the field of purification of steel slag, promoting the carbon-oxygen reaction at the slag-steel interface and reduces iron content in the slag.
Response 1: Thank you for your comments and encourgement.
Point 2: The manuscript after a carefully checking of English and as above mentioned the authors should add in the introduction a complete discussion of possibility to use van Der Waals equation to describe the gas-liquid phases. Indeed as mentioned by the authors the Volume of Fluid (VOF) method has drawbacks and to overcome them it is preferred Coupled Level-Set and Volume of Fluid (CLSVOF) method, which combine VOF function to achieve mass conservation and capture interface smoothly by computing the curvature and normal vector using the Level-Set function.Here they have showed as CLSVOF method was able to to analyse the mixing process under different injection flow rates and bottom-blowing positions.
Response 2: Thank you for your comments and encourgement. We have added in the manuscript. In the citations we have cited and summarised the relevant references.
Point 3: The work was well presented albeit the English should be more carefully improved to make more understandable the manuscript.The logical analysis of model was completely eviscerated and supported by results.The manuscript after a carefully checking of English and as above mentioned the authors should add in the introduction a complete discussion of possibility to use van Der Waals equation to describe the gas-liquid phases.
After this minor review the manuscript should be accepted.
Response 3: Thank you for your comments and encourgement.
Considering the Reviewer’s suggestion, we tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the content and framework of the paper.
Special thanks to you for your good comments.
We appreciate for Editors/Reviewers’ warm work earnestly, and hope that the correction will meet with approval.
Thanks again
Sincerely
QI
email：[email protected]。
Author Response File: 
Author Response.pdf
Reviewer 2 Report
There are some small errours in the document:
1. Abstract: change "to affect" by "that affects".
2. In 2.1, after Figure 1, change "A" by "a".
3. In table 2, change "molten" by "Molten steel" for clarity.
4. In page 13, Figure "9" should be changed by "14".
5. In the references there are maby that are not completed / incorrect format:
Reference [1] : number of pages.
Reference [7]: year in bold.
Reference [11]: year in bold.
Reference [12]: year in bold and erase "p."
Reference [15]: check if 111732 it's the page or there is an errour.
Reference [18]: year in bold.
Reference [34]: add pages.
Reference [39]: year in bold and add pages
Author Response
Response to Reviewer 2 Comments
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Numerical study on interfacial structure and mixing character-istics in converter based on CLSVOF method”.
We sincerely thank the reviewer for the time and effort spent evaluating our manuscript. We are very glad to have your positive feedback and especially appreciate the following professional questions and suggestions, which help us enhance the quality of the present work. Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. The detailed point-by-point responses to the comments are listed below:
Point 1: Abstract: change "to affect" by "that affects".
Response 1: Thank you for your comment. We feel sorry for our carelessness. We have completed the revision in the article.
Point 2: In 2.1, after Figure 1, change "A" by "a".
Response 2: Thank you for your comment. We feel sorry for our carelessness. We have completed the revision in the article.
Point 3: In table 2, change "molten" by "Molten steel" for clarity.
Response 3: Thank you for your comment. We feel sorry for our carelessness. We have completed the revision in the article.
Point 4: In page 13, Figure "9" should be changed by "14"
Response 4: Thank you for your comment. We feel sorry for our carelessness. We have completed the revision in the article.
Point 5: In the references there are maby that are not completed / incorrect forma.
Response : We have made adjustments to the relevant formatting issues identified by the reviewers. Changes to the references have been highlighted in the text.
Considering the Reviewer’s suggestion, we tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the content and framework of the paper.
Special thanks to you for your good comments.
We appreciate for Editors/Reviewers’ warm work earnestly, and hope that the correction will meet with approval.
Author Response File: Author Response.pdf
Reviewer 3 Report
Article review
Numerical study on interfacial structure and mixing characteristics in converter based on CLSVOF method
An interesting article, but a badly described part concerning - modeling or describing the phenomenon of converting. Nevertheless, very interesting results were obtained, which are guidelines for technologists as to the improvement of the steel converting process.
1. The converter is the most important stage is one of the important stages in steel production.
the most important or one of the most important ???? you have to decide
2. Gas-liquid two-phase flow of the molten bath in the converter plays a critical role in the productivity and quality level that can be achieved in the process.
please to improve english and the entire text
3. A hydraulic experiment
does this mean modeling in water?
4. et. al.[10-12], et. al.[13]
correct abbreviation -et al.
5. and the laws of the effects of operating parameters on interfacial structure and mixing characteristics are analyzed
6. Figure 1. What is:
slag – in blue color and Hsl- thin layer
Hm – molten depth an melts, there is molten slag and steel
into the liquid state - melt - consists of metal and slag, which are separated as a result of converting into metal-steel and slag, then why so many designations melt, slag, molten - it is necessary to organize the names and designations in the drawing
7. Table 2. Fluid properties in converte…
Argon Molten Slag
Molten –liquid metal-steel???
what is the source of this data?
8. To maintain a reasonable computational time and study the multiphase flow field
clearly in the converter, some hypotheses are proposed:
(1) Oxygen and argon are the constant physical incompressible Newtonian fluid.
(2) Temperature and chemical reactions in the molten bath are not considered.
(3) The standard wall function is adopted for the near wall treatment in the turbu-
lence model with a no-slip wall boundary.
Hypothesis definition: a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Temperature and chemical reactions in the molten bath are not considered- is it hypothesis???- limited evidence of and chemical reactions in the molten bath so for what is used convertor – only for mixing ? is a process of heat exchange (also heat from endo-exo chemical reactions) and mass, accelerated by mixing.
9. no explanations of formulas 1-14
10. The tracer concersation equation sloved by the UDF
tracer concersation ???
11. By reducing the low velocity regions and increasing the mixing efficiency of the molten bath, the productivity of the converter can be improved. And suitable bottom blow modes for good circulation in the molten bath.
something here is unfinished or finished too early - English grammar to improve.
Author Response
Response to Reviewer 3 Comments
Dear Editors and Reviewers:
Thank you for your letter and for the reviewers’ comments concerning our manuscript entitled “Numerical study on interfacial structure and mixing character-istics in converter based on CLSVOF method”.
We sincerely thank the reviewer for the time and effort spent evaluating our manuscript. We are very glad to have your positive feedback and especially appreciate the following professional questions and suggestions, which help us enhance the quality of the present work. Those comments are all valuable and very helpful for revising and improving our paper, as well as the important guiding significance to our researches. We have studied comments carefully and have made correction which we hope meet with approval. The detailed point-by-point responses to the comments are listed below:
Point 1: The converter is the most important stage is one of the important stages in steel production.
the most important or one of the most important ???? you have to decide
Response 1: Thank you for your comment. We have changed the content of the article. The converter is one of the important stages in steel production.
Point 2: Gas-liquid two-phase flow of the molten bath in the converter plays a critical role in the productivity and quality level that can be achieved in the process.
please to improve english and the entire text
Response 2: Thank you for your comment. We have added in the manuscript. We have improved the relevant text.
Point 3: A hydraulic experiment
does this mean modeling in water?
Response 3: Thank you for your comment. We feel sorry for not elaborating in the manuscript and causing doubts. In this paper, the water model experiment is used, that is, water is used instead of molten steel. The researchers used physical experiments rather than numerical simulation experiments.
Point 4: et. al.[10-12], et. al.[13]
correct abbreviation -et al.
Response 4: Thank you for your comment. We have added in the manuscript.
Point 5: and the laws of the effects of operating parameters on interfacial structure and mixing characteristics are analyzed
Response 5: Thank you for your comment.In this study, when the bottom blowing flow rate is 0.252 kg / s, it is recommended to distribute the outer bottom blowing position on the concentric circle of Dtuy, 2 / D2 = 0.33.
Point 6: Figure 1. What is: slag – in blue color and Hsl- thin layer Hm – molten depth an melts, there is molten slag and steel into the liquid state - melt - consists of metal and slag, which are separated as a result of converting into metal-steel and slag, then why so many designations melt, slag, molten - it is necessary to organize the names and designations in the drawing
Response 6: Thank you for your comment.In the process of converter steelmaking, the bottom layer is molten steel, and there is a thin layer of slag on the top of molten steel. Hsl is the thickness of the slag layer, and the Hm of the yellow part is the thickness of the molten steel.
Point 7: Table 2. Fluid properties in converte…Argon Molten Slag Molten –liquid metal-steel???what is the source of this data?
Response 7: Thank you for your comment.These physical parameters are obtained according to reference 13 and have been marked in this paper.
Point 8: To maintain a reasonable computational time and study the multiphase flow field
clearly in the converter, some hypotheses are proposed:
(1) Oxygen and argon are the constant physical incompressible Newtonian fluid.
(2) Temperature and chemical reactions in the molten bath are not considered.
(3) The standard wall function is adopted for the near wall treatment in the turbu-
lence model with a no-slip wall boundary.
Hypothesis definition: a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
Temperature and chemical reactions in the molten bath are not considered- is it hypothesis???- limited evidence of and chemical reactions in the molten bath so for what is used convertor – only for mixing ? is a process of heat exchange (also heat from endo-exo chemical reactions) and mass, accelerated by mixing.
Response 8: Thank you for your comment.We only study the influence of bottom blowing gas on the interface profile, and are more inclined to show that the CLSVOF method describes the interface profile more clearly. Therefore, the influence of temperature and chemical reaction is not considered.
Point 9: no explanations of formulas 1-14
Response 9: Thank you for your comment. We have added in the manuscript.
Point 10: The tracer concersation equation sloved by the UDF tracer concersation ???
Response 10: Thank you for your comment. We feel sorry for not elaborating in the manuscript and causing doubts. This paper adds an explanation. X represents the value of UDS, and the tracer concentration change is obtained by solving the uds transport equation.
Point 11: By reducing the low velocity regions and increasing the mixing efficiency of the molten bath, the productivity of the converter can be improved. And suitable bottom blow modes for good circulation in the molten bath. something here is unfinished or finished too early - English grammar to improve.
Response 11: Thank you for your comment. In this paper, we compare several bottom blowing flow rates and bottom blowing modes to obtain relatively good operating parameters.
Considering the Reviewer’s suggestion, we tried our best to improve the manuscript and made some changes in the manuscript. These changes will not influence the content and framework of the paper.
Special thanks to you for your good comments.
We appreciate for Editors/Reviewers’ warm work earnestly, and hope that the correction will meet with approval.
Once again, thank you very much for your comments and suggestions.
Yours sincerely,
Fengsheng Qi
E-mail: [email protected].
Author Response File: Author Response.pdf
