Abstract

Purpose The purpose of this paper is to examine the effect of surface roughness on the magneto-hydrodynamic (MHD) non-parallel squeeze film lubrication using non-Newtonian lubricant. Design/methodology/approach Based on the MHD thin film lubrication theory and the Stokes theory and homogenization method, the homogenized MHD Reynolds equation is derived considering the squeezing effect. Findings It is found that the obtained results indicate that the interaction among non-Newtonian, MHD and surface roughness influences is significant. Originality/value This study is original which compares the dimensionless load capacity and dimensionless response time among transverse, longitudinal and, for the first time, anisotropic surface roughness types under magneto-hydrodynamic non-Newtonian non-parallel squeeze film lubrication. Peer review The peer review history for this article is available at:


Authors

Mouda, Mouhcine;  Nabhani, Mohamed;  El Khlifi, Mohamed

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  • pre-publication peer review (FINAL ROUND)
    Decision Letter
    2020/05/29

    29-May-2020

    Dear MOUDA, Mouhcine; Nabhani, Mohamed; El Khlifi, Mohamed

    It is a pleasure to accept your manuscript ilt-02-2020-0071.R1, entitled "Surface roughness effects on non-Newtonian MHD non-parallel squeeze film bearing" in its current form for publication in Industrial Lubrication and Tribology. Please note, no further changes can be made to your manuscript.

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    Prof. Carsten Gachot
    Editor, Industrial Lubrication and Tribology
    carsten.gachot@tuwien.ac.at

    Decision letter by
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    Reviewer report
    2020/04/19

    No further comments.

    Reviewed by
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    Author Response
    2020/04/18

    Response to Reviewer: 1

    Authors are very thankful to the reviewer for their valuable comments to improve the scientific and the technical content of the paper.

    Q 1:
    - Related to homogenization strategies, there is a recent review paper of Gruetzmacher and Profito dealing with surface roughness and textures.
    - Related to squeeze film lubrication, you may refer to the following manuscript that shows beneficial effects of deterministic surface textures for squeeze film dampers
    Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

    Ans 1:
    These two interesting papers are referred in the text.

    Q 2:
    - The last paragraph of the introduction should be improved.

    Ans 2:
    This paragraph is rewritten and improved.

    Q 3:
    - The number of equations must be reduced to improve readability.

    Ans 3:
    This is done as suggested by the reviewer.

    Q 4:
    - Have you considered cavitation and mass conservation in your model?

    Ans 4:
    During the squeeze movement, there is a generation of hydrodynamic pressure in the lubricant and the cavitation cannot occur when the upper and lower bearing surfaces approach each other.
    The pressure in this squeeze film does not drop below to its vaporization pressure. Then, the cavitation is not taken into account.

    Q 5:
    - The manuscript is rather descriptive in nature. The obtained results should be better explained and discussed.

    Ans 5:
    More details are introduced in the results section.

    Q 6:
    - Only a few citations have been included. This should be improved by more up-to-date citations.

    Ans 6:
    Some recent citations are added in introduction.

    Q 7:
    - The number of figures should be reduced by grouping them together.

    Ans 7:
    Of course, this change is done.



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  • pre-publication peer review (ROUND 1)
    Decision Letter
    2020/04/05

    05-Apr-2020

    Dear Mr. MOUDA:

    Manuscript ID ilt-02-2020-0071 entitled "Surface roughness effects on non-Newtonian MHD non-parallel squeeze film bearing" which you submitted to the Industrial Lubrication and Tribology, has been reviewed. The comments of the reviewer(s) are included at the bottom of this letter.

    The reviewer(s) have recommended major revisions to the submitted manuscript, before it can be considered for publication. Therefore, I invite you to respond to the reviewer(s)' comments and revise your manuscript.

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    Once again, thank you for submitting your manuscript to the Industrial Lubrication and Tribology and I look forward to receiving your revision.

    Sincerely,
    Prof. Carsten Gachot
    Editor, Industrial Lubrication and Tribology
    carsten.gachot@tuwien.ac.at

    Reviewer(s)' Comments to Author:
    Reviewer: 1

    Comments to the Author
    - Related to homogenization strategies, there is a recent review paper of Gruetzmacher and Profito dealing with surface roughness and textures.
    - Related to squeeze film lubrication, you may refer to the following manuscript that shows beneficial effects of deterministic surface textures for squeeze film dampers
    -- Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

    • The last paragraph of the introduction should be improved.

    • The number of equations must be reduced to improve readability.

    • Have you considered cavitation and mass conservation in your model?

    • The manuscript is rather descriptive in nature. The obtained results should be better explained and discussed.

    • Only a few citations have been included. This should be improved by more up-to-date citations.

    • The number of figures should be reduced by grouping them together.

    Reviewer: 2

    Comments to the Author
    (There are no comments.)
    Reviewer: 1

    Recommendation: Major Revision

    Comments:
    - Related to homogenization strategies, there is a recent review paper of Gruetzmacher and Profito dealing with surface roughness and textures.
    - Related to squeeze film lubrication, you may refer to the following manuscript that shows beneficial effects of deterministic surface textures for squeeze film dampers
    -- Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

    • The last paragraph of the introduction should be improved.

    • The number of equations must be reduced to improve readability.

    • Have you considered cavitation and mass conservation in your model?

    • The manuscript is rather descriptive in nature. The obtained results should be better explained and discussed.

    • Only a few citations have been included. This should be improved by more up-to-date citations.

    • The number of figures should be reduced by grouping them together.

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: Please see comments below.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: Please see comments below.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: Please see comments below.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: Please see comments below.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: Please see comments below.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: Please see comments below.

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?: Please see comments below.

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: No, I would not like my name to appear with my report on Publons

    Reviewer: 2

    Recommendation: Accept

    Comments:
    (There are no comments.)

    Additional Questions:
    Originality: Does the paper contain new and significant information adequate to justify publication?: The paper contains new information about the lubrication field, containing elements of novelty. The publication of this paper is justified.

    Relationship to Literature: Does the paper demonstrate an adequate understanding of the relevant literature in the field and cite an appropriate range of literature sources? Is any signficant work ignored?: Bibliographic references used by the author are current and include major workspublished in the field. Scientific information from the cited work are properly analyzed and the results come in support of the theme analysis.

    Methodology: Is the paper's argument built on an appropriate base of theory, concepts, or other ideas? Has the research or equivalent intellectual work on which the paper is based been well designed? Are the methods employed appropriate?: From the methodological point of view, the paper studies the current issues based on new concepts and having an adequate theoretical support. Problems analyzed are properly addressed and the results are considered significant.

    Results: Are results presented clearly and analysed appropriately? Do the conclusions adequately tie together the other elements of the paper?: The results obtained are consistent with scientific hypotheses and experimental methodology used. The results are clearly presented and the conclusions of the work are clearly and properly defined.

    Practicality and/or Research implications: Does the paper identify clearly any implications for practice and/or further research? Are these implications consistent withthe findings and conclusions of the paper?: Conclusions presented at the end result logically from the structure work, opening new research directions in the field of MHD bearings.

    Quality of Communication: Does the paper clearly express its case, measured against the technical language of the field and the expected knowledge of the journal's readership? Has attention been paid to the clarity of expression and readability, such as sentence structure, jargon use, acronyms, etc.: The quality of communication is in accordance with the journal requests

    Reproducible Research: If appropriate, is sufficient information, potentially including data and software, provided to reproduce the results and are the corresponding datasets formally cited?:

    This journal is participating in Publons Transparent Peer Review. By reviewing for this journal, you agree that your finished report, along with the author’s responses and the Editor’s decision letter, will be linked to from the published article to where they appear on Publons, if the paper is accepted. If you have any concerns about participating in the Transparent Peer Review pilot, please reach out to the journal’s Editorial office. Please indicate below, whether you would like your name to appear with your report on Publons by indicating yes or no. All peer review content displayed here will be covered by a Creative Commons CC BY 4.0 license.: No, I would not like my name to appear with my report on Publons

    Decision letter by
    Cite this decision letter
    Reviewer report
    2020/03/17

    • Related to homogenization strategies, there is a recent review paper of Gruetzmacher and Profito dealing with surface roughness and textures.
    • Related to squeeze film lubrication, you may refer to the following manuscript that shows beneficial effects of deterministic surface textures for squeeze film dampers
      -- Wear Behavior of Laser‐Patterned Piston Rings in Squeeze Film Dampers

    • The last paragraph of the introduction should be improved.

    • The number of equations must be reduced to improve readability.

    • Have you considered cavitation and mass conservation in your model?

    • The manuscript is rather descriptive in nature. The obtained results should be better explained and discussed.

    • Only a few citations have been included. This should be improved by more up-to-date citations.

    • The number of figures should be reduced by grouping them together.

    Reviewed by
    Cite this review
All peer review content displayed here is covered by a Creative Commons CC BY 4.0 license.