Investigating the Behaviour of Air–Water Upward and Downward Flows: Are You Seeing What I Am Seeing?
, Olumayowa T. Kajero 2, Fawziyah O. Olarinoye 3, Dickson O. Udebhulu 4, Donglin Zhao 5, Aliyu M. Aliyu 6 and Abdelsalam Al-Sarkhi 7Round 1
Reviewer 1 Report
This paper was submitted a few months ago. It was rejected and now the authors have resubmitted it. The paper has clearly improved. However, some aspects of the paper should be revised and improved.
The paper is very long. Its extension is excessive. The authors should simplify and summarize. There are repeated issues and very long explanations.
I am not clear about the novelty and usefulness of the work presented in the paper.
The manuscript requires careful attention to presentation. The text must be carefully checked in terms of styles and formatting for symbols, equations, figures, tables and references. For example, a parenthesis is missing on line 215, word spacing is missing on line 262, a parenthesis is missing on line 511, etc.
Many figures need to be improved. Figure 1 needs to be improved (also many other figures). There are texts with a very large size, other texts with a very small size. Figure 2 and others have texts with too large letters, etc.
To conclude, in my opinion, the paper needs major revisions to be published in a prestigious scientific journal. The paper needs improvements in the substance and in the forms.
Author Response
This paper was submitted a few months ago. It was rejected and now the authors have resubmitted it. The paper has clearly improved. However, some aspects of the paper should be revised and improved.
The paper is very long. Its extension is excessive. The authors should simplify and summarize. There are repeated issues and very long explanations.
Response: The paper has been reduced drastically. Repeated issues and very long explanations have been reduced as suggested.
I am not clear about the novelty and usefulness of the work presented in the paper.
Response: Here is the novelty: Understanding the behaviour of gas–liquid flows in upward and downward pipe configurations in chemical, petroleum, and nuclear industries is vital when optimal design, operation, production, and safety are of paramount concern. Unfortunately, the information concerning the behaviour of such flows in large pipe diameters is rare. This article aims to bridge that gap by reporting air–water upward and downward flows in 127 mm internal diameter pipes using advanced conductance ring probes located at two measurement locations.
The manuscript requires careful attention to presentation. The text must be carefully checked in terms of styles and formatting for symbols, equations, figures, tables, and references. For example, a parenthesis is missing on line 215, word spacing is missing on line 262, a parenthesis is missing on line 511, etc.
Response: The observed challenges with the presentation have been addressed. Parenthesis has been added on lines 215 and 511. Word spacing has been added on line 262.
Many figures need to be improved. Figure 1 needs to be improved (also many other figures). There are texts with a very large size, other texts with a very small size. Figure 2 and others have texts with too large letters, etc.
Response: Figures 1, 2, and 9 have been replaced with better ones. The issues with Figure 2 and others have been addressed.
To conclude, in my opinion, the paper needs major revisions to be published in a prestigious scientific journal. The paper needs improvements in the substance and in the forms.
Response: Major revisions have been carried out on the manuscript including major improvements in the substance and in the forms.
Reviewer 2 Report
This paper addresses an experimental analysis to examine the behaviour of air-water upward and downward flows in large pipe diameter. The article is interesting, and despite addressing a topic that is not new, it presents new insights; the paper aims to bridge that gap by performing experiments of air–water upward and downward flows in large internal diameter pipes. The present work considered a complete description of the experimental facility, and the methods were adequately described. In general, enough information is provided for the replication of the obtained data. Furthermore, the paper is still well organized,the discussion is suitable, and the results support the conclusions. For these motives, I accept the proposed manuscript for publication after minor revision.
The English language and style paper should be checked, and for consistency, the authors should consider writing the manuscript in American English or British English.
The references should be checked:
Abdulkadir, M., Jatto, D.G., Abdulkareem, L.A., and Zhao, D., ? 2020 ?. Pressure drop, void fraction and flow pattern of vertical air–silicone oil flows using differential pressure transducer and advanced instrumentation. Chemical Engineering Research and Design 48, 3063–3070.
References not mentioned in the text of the article:
Aliyu, A.M., Almabrok, A.A., Baba, Y. D., Yeung, H., Lao, L., Kim, K.C., 2017. Upward gas–liquid two-phase flow 880 after a U-bend in a large diameter serpentine pipe. International Journal of Heat and Mass Transfer 108, 784–800.
Almabrok, A.A, Aliyu, A.M., Baba, Y. D., Ribeiro, J.X. F., Archibong-Eso, A, Lao, L., Yeung, H., 2020. A Comparative Analysis of Upward and Downward Pressure Gradient Behaviour in Vertical Gas-Liquid Two-Phase Flows in a Large Diameter Pipe Facility. In: SPE Nigeria Annual International Conference and Exhibition. Society of Petroleum Engineers. DOI: 10.2118/203639-MS
Hernandez–Perez, V., Azzopardi, B.J., Kaji, R., Da Silva, M.J., Beyer, M., and Hampel, U., 2010. Wisp-like structures in vertical gas–liquid pipe flow revealed by wire mesh sensor studies. International Journal of Multiphase Flow 36, 908–915.
Kim, T.H., Chalgeri, V.S., Yoon, W., Yun, B.J., Jeong, J.H., 2018. Visual observations of flow patterns in downward air–water two-phase flows in a vertical narrow rectangular channel. Annual Nuclear Energy 114, 384–394.
References mentioned in the text of the article that should be added:
Page 14, line 346, Jayanti and Hewitt, 1992
Page 15, lines 377, 378, 385, Godbole et al., 2011
Author Response
The English language and style paper should be checked, and for consistency, the authors should consider writing the manuscript in American English or British English.
Response: The English language is British English and the style throughout the manuscript has been addressed as observed.
The references should be checked:
Abdulkadir, M., Jatto, D.G., Abdulkareem, L.A., and Zhao, D., ? 2020 ?. Pressure drop, void fraction, and flow pattern of vertical air–silicone oil flows using differential pressure transducer and advanced instrumentation. Chemical Engineering Research and Design 48, 3063–3070.
Response: This has been addressed. The year of publication, volume, and pages are 2020, 159, 262–277, respectively.
References not mentioned in the text of the article:
Aliyu, A.M., Almabrok, A.A., Baba, Y. D., Yeung, H., Lao, L., Kim, K.C., 2017. Upward gas–liquid two-phase flow 880 after a U-bend in a large diameter serpentine pipe. International Journal of Heat and Mass Transfer 108, 784–800.
Response: This reference that was not cited in the text has been removed.
Almabrok, A.A, Aliyu, A.M., Baba, Y. D., Ribeiro, J.X. F., Archibong-Eso, A, Lao, L., Yeung, H., 2020. A Comparative Analysis of Upward and Downward Pressure Gradient Behaviour in Vertical Gas-Liquid Two-Phase Flows in a Large Diameter Pipe Facility. In: SPE Nigeria Annual International Conference and Exhibition. Society of Petroleum Engineers. DOI: 10.2118/203639-MS
Response: What I cited in the text and in the reference section are Almabrok et al. (2016) and Almabrok, A.A., Aliyu, A.M., Lao, L., Yeung, H., 2016. Gas–liquid flow behaviour in a downward section of large diameter vertical serpentine pipes. International Journal of Multiphase Flow 78, 25–43, respectively.
Hernandez–Perez, V., Azzopardi, B.J., Kaji, R., Da Silva, M.J., Beyer, M., and Hampel, U., 2010. Wisp-like structures in vertical gas–liquid pipe flow revealed by wire mesh sensor studies. International Journal of Multiphase Flow 36, 908–915.
Response: This reference that was not cited in the text has been removed.
Kim, T.H., Chalgeri, V.S., Yoon, W., Yun, B.J., Jeong, J.H., 2018. Visual observations of flow patterns in downward air–water two-phase flows in a vertical narrow rectangular channel. Annual Nuclear Energy 114, 384–394.
Response: This reference that was not cited in the text has been removed.
References mentioned in the text of the article that should be added:
Page 14, line 346, Jayanti and Hewitt, 1992
Response: Reference now added.
Page 15, lines 377, 378, 385, Godbole et al., 2011
Response: Reference now added.
Round 2
Reviewer 1 Report
After this last review, the authors have made changes and the paper has been improved. However, the manuscript requires careful attention to presentation (figures, equations, etc.). Many figures need to be improved (there are texts with a very large size, other texts with a very small size, etc.).
Author Response
Response: All the concerns raised regarding equations and texts have been addressed as suggested. These can be found highlighted in red colour throughout the manuscript. Also, some of the figures have also been replaced as suggested.
