Study and Analysis on the Influence Degree of Particle Settlement Factors in Pipe Transportation of Backfill Slurry
Round 1
Reviewer 1 Report
- The quality of the figures is unsatisfactory. They are not clear in hard copy.
- In the movement of particles in the fluid, the forces between the particles and the fluid have a significant effect on the deposition. The author do not talk about the forces that you considered in your study clearly. The density of the particles is high and some forces need to be taken into account such as added mass. If you ignore them, you should explain why. Also, you should consider whether the Lift force is significant or not.
- In the section 4.1 author, talk about the Drag force. What equation do you use to calculate drag force?
- Author do not talk about the quality of the mesh, mesh independency, and fluid flow timestep. These parameters are so crucial in your simulation.
- Table 4 presents experimental plan. Author want to investigate the effect of three parameters. You should do an experimental design to find the best value of each parameter and the number of the experiments. In addition, the table 4, is not satisfactory because there are some interactions between parameters, if you want to investigate the effect of the parameters without experimental design you need 27 experimental sets to study the effect of each parameter without interaction effect. In the table 9 and the regression equation, the interaction between 3 parameter is not taken into accounts.
- Perhaps it is better to add a contour of the flow pattern of particle deposition in the tube from the COMSOL. Throughout the manuscript, there is a few information about the simulation condition and results.
Author Response
Please find the attachment, thank you very much.
Author Response File: 
Author Response.pdf
Reviewer 2 Report
Modify the title.
Improve the introduction. refer: https://doi.org/10.1016/j.molliq.2020.114441; https://doi.org/10.1016/j.matpr.2020.02.851; https://doi.org/10.1080/19392699.2019.1674843; DOI: 10.1021/acsomega.9b03477;
The test sample collected from which mine? write the name and details.
In 4.1, " On the contrary, when the speed is slow, the particles in the slurry are affected by gravity and buoyancy, and move in the vertical direction, leading to sedimentation. When the flow velocity is continuously accelerated, the friction between the slurry and pipe increases, and the pipe is damaged or even burst" is confusing?
In practical, the slurry contains different size particles. viscosity, slurry stability and pressure are the most important parameters to explain the flow behavier. These terms should be included in the study design.
Modify the conclusion.
Author Response
Dear reviewer 2:
Please see the attachment. Thank you very much.
Author Response File: Author Response.pdf
Reviewer 3 Report
A commercial software was used in this paper for modelling.However the current model is very basic and not properly validated with experiments. Without significant contribution, the model and its usages for parametric analysis can not be accepted
Author Response
Dear reviewer 3:
Please see the attachment. Thank you very much.
Author Response File: Author Response.pdf
Reviewer 4 Report
Page 4. What linear dimension was used in determining the Reynolds number? Pipe diameter, paticle size?
Page 6. Y=2.811264002-4.654491543x1+0.007152641406x2-1.4821171688x3-0.017519122657x1∗x2+2.4067697010x1∗x3+0.003943149129x2∗x3 There are too many numbers in the coefficients. You can leave only three or four significant digits. E.g. Y=2.811-4.654x1+7.153E-3x2-1.482x3-1.752E-2x1
∗x2+2.407x1∗x3+3.943E-3x2∗x3 Three digits after the decimal separator is enough.
Author Response
Dear reviewer 4:
Please see the attachment. Thank you very much.
Author Response File: Author Response.pdf
Round 2
Reviewer 3 Report
Accept
