Effect of Vertical Pressure on Temperature Field Distribution of Bulk Paddy Grain Pile
Round 1
Reviewer 1 Report
1. It was worth paying more attention to the initial parameters of the material. For example humidity, degree of maturity, variety and others
2. It was worth paying more attention to justifying the size of the booth.
3. It was worthwhile to substantiate the distribution of sensors in the volume of material in more detail.
4. In the results and conclusions, you can indicate the impact of the results of the study on the terms of safe storage and other indicators.
Author Response
Manuscript ID: applsci-1949268
Title: Effect of Vertical Pressure on Temperature Field Distribution of Bulk Paddy Grain Pile
Journal: Applied Sciences
Editor: Ms. Jenell Tao
1-October-2022
We have received your letter dated September 28, 2022, giving us your and reviewers′ comments for the revisions of our manuscript (applsci-1949268). The authors much appreciate the respectful editor and reviewers for their careful review of our manuscript. The scientific quality of the manuscript has been enhanced in light of the valuable comments. The authors have taken full considerations of all these comments and made clarifications and corrections as advised by the reviewers. A detailed list of changes mentioned point by point with respect to the reviewers’ comments is included in this reply letter, and it is clearly indicated in what part of the revised manuscript these comments are implemented. In this context, the black texts are those given by the respectful reviewers. The blue texts are our response in this file, which might be more than those included in the revised manuscript. The green texts are the main content included in the revised manuscript. Thanks again to the hard work of the editor and reviewers!
Reply to reviewer: 1
We are grateful to reviewer#1for his/her effort in reviewing our manuscript and his/her positive feedback. He/She think the paper is very well written, and the study is interesting. Here below we address the questions and suggestions raised by reviewer#1.
Comment 1: It was worth paying more attention to the initial parameters of the material. For example humidity, degree of maturity, variety and others.
Response: Thank you very much for your careful reminder and valuable advice. We have added the initial parameters of the material into the text according to your suggestion.
Page 4, Lines 141:
China’s northeast japonica rice (early-maturing, Longjing-21) was selected for the study.
Page 4, Lines 146−147:
The relative humidity of the bulk grain pile was 67.3%.
Comment 2: It was worth paying more attention to justifying the size of the booth.
Response: Thank you very much for your careful reminder and valuable suggestions. As the commentator mentioned, the size of the booth was worth paying more attention to justifying. We agree with the reviewers' concerns about the applicability of the results. We compared a large number of methods in the literature and found that many researchers widely used laboratory experiments to study the heat transfer process of grain piles (e.g. 10.1080/01457632.20 19.1576420, 10.1016/j.biosystemseng.06.018, 2017.10.1038/s41598-020-66130-6, 0.13031/aim.20162461211, 10.1016/j.jspr.2014. 03.009). This method can accurately obtain the temperature distribution of grain pile, and is also convenient to study the influence of different factors. We studied the influence of different vertical pressure on heat transfer of grain pile, and proposed a new research method and test equipment. The results show that the heat transfer process is affected by the grain pile pressure.
Page 4, Lines 172−173:
To study the effect of grain storage pressure on heat transfer of grain piles, a model test was conducted on stored bulk paddy grain piles.
Comment 3: It was worthwhile to substantiate the distribution of sensors in the volume of material in more detail.
Response: Thank you very much for your careful reminder and valuable advice. Your suggestion is very helpful for us to improve the quality of the text. The sensor distribution has been described in detail. Some researchers used similar programs to study heat transfer (e.g. 10.1038/s41598-020-66130-6, 10.101 6/j.biosystemseng.2017.06.018, 10.11159/ffhmt17.147). In addition, we have added a more detailed description of sensor distribution according to your suggestion to make them easier understand to readers.
Page 3, Lines 131−134:
Temperature sensors was placed along a measurement plane (X-Z plane in Fig. 1). The sensors were spaced in the X- (lateral) and the Z- (vertical) directions to continuously record the temperature distributions in the grain pile (Fig. 1).
Comment 4: In the results and conclusions, you can indicate the impact of the results of the study on the terms of safe storage and other indicators.
Response: Thank you very much for your careful reminder and valuable advice. Your suggestion is very helpful for us to improve the quality of the text. And we have added the impact of the results of the text on the terms of safe storage according to your suggestion.
Page 14, Lines 479−482:
The research results can predict and analyze the changes in the temperature field of the grain piles, facilitating the formulation of effective control measures to reduce grain spoilage during storage, maintain the quality of grain, and ensure the safety of grain storage.
If you and reviewers have any other questions, please do not hesitate to contact us as soon as possible. We thank you and reviewers again for your patience, help and constant attention to our manuscript.
Sincerely yours,
Guixiang Chen
Author Response File: 
Author Response.docx
Reviewer 2 Report
Authors have studied the influence of vertical pressure on the heat transfer in the grain storage environment of large-scale storage structures, a self-made grain pile test chamber and by using the multi-field coupling software platform, COMSOL.
It is very interesting work. The authors have presented the work very systematically. In fact, I have come across this kind of work for the first time.
This paper may be accepted in the present form for publication.
Author Response
Manuscript ID: applsci-1949268
Title: Effect of Vertical Pressure on Temperature Field Distribution of Bulk Paddy Grain Pile
Journal: Applied Sciences
Editor: Ms. Jenell Tao
1-October-2022
We have received your letter dated September 28, 2022, giving us your and reviewers′ comments for the revisions of our manuscript (applsci-1949268). The authors much appreciate the respectful editor and reviewers for their careful review of our manuscript. The scientific quality of the manuscript has been enhanced in light of the valuable comments. The authors have taken full considerations of all these comments and made clarifications and corrections as advised by the reviewers. A detailed list of changes mentioned point by point with respect to the reviewers’ comments is included in this reply letter, and it is clearly indicated in what part of the revised manuscript these comments are implemented. In this context, the black texts are those given by the respectful reviewers. The blue texts are our response in this file, which might be more than those included in the revised manuscript. The green texts are the main content included in the revised manuscript. Thanks again to the hard work of the editor and reviewers!
Reply to reviewer: 2
We are grateful to reviewer#2for his/her effort in reviewing our manuscript and his/her positive feedback. He/She think the paper is very well written, and the study is interesting.
If you and reviewers have any other questions, please do not hesitate to contact us as soon as possible. We thank you and reviewers again for your patience, help and constant attention to our manuscript.
Sincerely yours,
Guixiang Chen
Author Response File: Author Response.docx
Reviewer 3 Report
The work is very interesting and is relevant to the journal scope. However, I recommend this work to be published before incorporating the following minor corrections.
1. The main work performed should be more explicitly discussed in the abstract section.
2. Literature needs more references to be cited that are recent and relevant to the work. I will suggest the following.
a. Impact of the KKL Correlation Model on the Activation of Thermal Energy for the Hybrid Nanofluid (GO+ ZnO+ Water) Flow through Permeable Vertically Rotating Surface
b. Mesoscopic Simulation for Magnetized Nanofluid Flow Within a Permeable 3D Tank
c. A Magnetite–Water-Based Nanofluid Three-Dimensional Thin Film Flow on an Inclined Rotating Surface with Non-Linear Thermal Radiations and Couple Stress Effects
c. Numerical solutions of higher order boundary value problems via wavelet approach
d. An analytical investigation of the mixed convective Casson fluid flow past a yawed cylinder with heat transfer analysis
e. On the analysis of the non-Newtonian fluid flow past a stretching/shrinking permeable surface with heat and mass transfer
f. Extension of optimal homotopy asymptotic method with use of Daftardar–Jeffery polynomials to Hirota–Satsuma coupled system of Korteweg–de Vries equations
3. All the equations must be properly cited.
4. All the graphs may be explained with its physical significance.
5. Conclusion may be provided in bullets form.
6. A nomenclature may be added.
7. The font size of the introduction part me be adjusted.
Author Response
Manuscript ID: applsci-1949268
Title: Effect of Vertical Pressure on Temperature Field Distribution of Bulk Paddy Grain Pile
Journal: Applied Sciences
Editor: Ms. Jenell Tao
1-October-2022
We have received your letter dated September 28, 2022, giving us your and reviewers′ comments for the revisions of our manuscript (applsci-1949268). The authors much appreciate the respectful editor and reviewers for their careful review of our manuscript. The scientific quality of the manuscript has been enhanced in light of the valuable comments. The authors have taken full considerations of all these comments and made clarifications and corrections as advised by the reviewers. A detailed list of changes mentioned point by point with respect to the reviewers’ comments is included in this reply letter, and it is clearly indicated in what part of the revised manuscript these comments are implemented. In this context, the black texts are those given by the respectful reviewers. The blue texts are our response in this file, which might be more than those included in the revised manuscript. The green texts are the main content included in the revised manuscript. Thanks again to the hard work of the editor and reviewers!
Reply to reviewer: 3
We are grateful to reviewer#3 for his/her effort in reviewing our manuscript and his/her positive feedback. This reviewer appreciates the efforts of the authors. And he/she believes that the manuscript manuscript contains reasonable explanations for the small system used. However, there are still some issues that can be addressed, before the accept recommendation is given.
Comment 1: The main work performed should be more explicitly discussed in the abstract section.
Response: Thank you very much for your careful reminder and valuable advice. We have discussed the main work done more concisely and accurately in the abstract section according to your suggestion.
Grain storage pressure is an important factor affecting the grain pile temperature, and its influencing mechanism needs to be studied further. The distribution and variation of the temperature field of a bulk grain pile under different vertical pressures and a temperature difference of 25 °C are studied by a model test and numerical simulation. Initially, the temperature change and heat transfer law at different points in the bulk grain pile space are studied under different vertical pressures using a self-made test device. Thereafter, a multi-field coupling software platform COMSOL is used to simulate and study the distribution law of the temperature field in the bulk grain pile under different vertical pressures. The influence mechanism of vertical pressure on the temperature field of the grain pile is discussed, based on the micro-airflow velocity field obtained by numerical simulation. The results show that the numerical simulation and experimental results are in good agreement. With the increase in vertical pressure, the heat transfer rate of the grain pile increases gradually, the convective heat transfer in the grain pile is hindered, and the temperature distribution gradually attains uniformity. When the vertical pressure increases from 50 kPa to 200 kPa, the temperature of the grain pile decreases by approximately 0.6–2.7 °C, and the rate of change of the temperature gradient reaches 7.4%. Under different vertical pressures, the proportion of the high-temperature area decreases linearly with the storage duration. The micro-airflow velocity field affects the temperature transfer in the bulk grain pile, resulting in the temperature at the top of the storage structure being higher than that at the bottom. The research methods and conclusions in this study can provide theoretical support and reference for the multi-field coupling research on bulk grain pile storage.
Comment 2: Literature needs more references to be cited that are recent and relevant to the work. I will suggest the following.
- Impact of the KKL Correlation Model on the Activation of Thermal Energy for the Hybrid Nanofluid (GO+ ZnO+ Water) Flow through Permeable Vertically Rotating Surface
- Mesoscopic Simulation for Magnetized Nanofluid Flow Within a Permeable 3D Tank
- A Magnetite–Water-Based Nanofluid Three-Dimensional Thin Film Flow on an Inclined Rotating Surface with Non-Linear Thermal Radiations and Couple Stress Effects
- Numerical solutions of higher order boundary value problems via wavelet approach
- An analytical investigation of the mixed convective Casson fluid flow past a yawed cylinder with heat transfer analysis
- On the analysis of the non-Newtonian fluid flow past a stretching/shrinking permeable surface with heat and mass transfer
- Extension of optimal homotopy asymptotic method with use of Daftardar–Jeffery polynomials to Hirota–Satsuma coupled system of Korteweg–de Vries equations
Response: Thank you very much for your careful reminder and valuable suggestions. we have added more references to be cited that are recent and relevant to the work according to your suggestion.
Page 2, Lines 66−68:
The influence of the change of physical parameters caused by the height of the grain pile on heat transfer should be considered when analyzing the grain storage safety in large storage structures[11-13].
[11] Rizk D , Ullah A , Ikramullah, et al. Impact of the KKL Correlation Model on the Activation of Thermal Energy for the Hybrid Nanofluid (GO+ZnO+Water) Flow through Permeable Vertically Rotating Surface[J]. Energies, 2022, 15, 2872.
[12] Shah Z , Kumam P , Ullah A , et al. Mesoscopic Simulation for Magnetized Nanofluid Flow Within a Permeable 3D Tank[J]. IEEE Access, 2021, 9: 135234–135244 .
[13] Khan S , Selim M M , Gepreel K A , et al. An analytical investigation of the mixed convective Casson fluid flow past a yawed cylinder with heat transfer analysis[J]. Open Physics, 2021, 19(1): 341–351.
Comment 3: All the equations must be properly cited.
Response: Thank you very much for your careful reminder. The manuscript has been carefully examined and revised. Current method normally assumed that maize is an isotropic porous medium, and the model for simulating heat transfer in grain bulk has also been developed. But current model did not consider the impact of grain storage pressure on heat transfer. In the simulation of the text, the change of porosity caused by vertical pressure was considered. We have also considered that paddy is a living organism with water absorption and desorption feature. Thus, the model is as shown in the text. In addition, we have also condensed some explanations about the model according to your suggestions to make them easier understand to readers.
Page 12, Lines 198−206:
∂uj ⁄ ∂xj =0 (1)
uj(j=1,2,3) is the air flow rate in the direction xj, u1=u, u2=u3=v. In rectangular Cartesian coordinate system, x1=x, x2=y, x3=z.
In addition, paddy is a living organism with water absorption and desorption feature.
Comment 4: All the graphs may be explained with its physical significance.
Response: Thank you for your careful reminder and valuable suggestions. Your suggestion is very helpful for us to improve the quality of the paper. The significance of the graphs in the text have been explained in the paper. we have added the significance of the graphs according to your suggestion.
Page 6, Lines 235−237:
Temperature is an important factor affecting the safety of grain storage. To study the temperature variation of grain pile under different pressures, the temperature change data of grain pile at different measuring points for 72h were measured.
Page 9, Lines 326−327:
To verify the accuracy of the numerical simulation and parameter values, the simulation data and experiment data under the same conditions were compared and analyzed.
Page 10, Lines 350−351:
To clarify the temperature change of stored grain pile，the distribution of the temperature field in the bulk grain pile at different time instants was studied and analyzed.
Page 11, Lines 386−388:
To reveal the influence of pressure on the temperature field distribution of grain pile, the temperature field of grain pile at the same time under different pressures was simulated.
Comment 5: Conclusion may be provided in bullets form.
Response: Thank you very much for your careful reminder and valuable suggestions. We have revised it according to your suggestion.
Page 11−12, Lines 369−381:
- With the increase in vertical pressure, the heat conduction between the grains of the bulk grain pile is intensified, the convection heat transfer of micro-air flow between the pores is gradually reduced, and the heat transfer rate is accelerated.
- The temperature of the bulk grain pile decreases by approximately 0.6–2.7 °C, compared to the initial storage temperature, and the rate of change of the temperature gradient reaches 7.4%.
- The maximum temperature difference between the middle plane of the bulk grain pile and the low-temperature boundary wall is 9.4 °C, when the vertical pressure is 50 kPa; the corresponding minimum value is 7.7 °C, when the vertical pressure is 200 kPa.
- Under different vertical pressures, the simulated and experimental values of temperature of the grain pile are consistent. With the increase in vertical pressure, the convective heat transfer is hindered, and the temperature distribution gradually becomes more uniform.
- Under different pressures, the proportion of high-temperature area decreases linearly with the storage duration, and the decline coefficient increases with increase in the vertical pressure.
- The micro-airflow affects the temperature transfer in the grain pile. The high-temperature region exhibits a wide top and narrow bottom, while the low-temperature region exhibits a narrow top and wide bottom, in the temperature distribution.
Comment 6: A nomenclature may be added.
Response: Thank you for your suggestion and we are sorry that the manuscript didn't explain it clearly. Your suggestion is very helpful for us to improve the quality of the paper. We have added nomenclature according to your suggestion.
Page 15, Lines 512−514:
Nomenclature
|
u |
Air flow rate (m/s) |
|
Ñ„ |
Porosity of paddy bulk grain pile |
|
p |
Air flow pressure (Pa) |
|
β |
Coefficient of air expansion |
|
ρa |
Air density (kg/m3) |
|
ρb |
Bulk grain density (kg/m3) |
|
μ |
Aerodynamic viscosity (Pa·s) |
|
K |
Permeability (m2) |
|
τ |
Tortuosity factor of grain pile |
|
g |
Acceleration of gravity (m2/s) |
|
T |
Temperature of grain pile (K) |
|
Ca |
Specific heat capacity of air (J·kg-1·K) |
|
Cb |
Specific heat capacity of grain pile (J·kg-1·K) |
|
hfg |
Heat of evaporation from grain pile (J/mg) |
|
Wg |
Moisture content of grain pile |
|
qh |
Heat released by the respiration of grains (J/mg) |
|
qw |
Respiratory water yield of grain pile (kg/mg) |
|
Dv |
Diffusion coefficient of moisture in the air (m2/s) |
|
ω |
Moisture content of air |
Comment 7: The font size of the introduction part me be adjusted.
Response: Thank you very much for your careful reminder and valuable suggestions. We have revised the font size of the introduction part according to your suggestion.
If you and reviewers have any other questions, please do not hesitate to contact us as soon as possible. We thank you and reviewers again for your patience, help and constant attention to our manuscript.
Sincerely yours,
Guixiang Chen
Author Response File: Author Response.docx
