Please find below a link to the decision and reviewers' comments
regarding your submission to Journal of Nanofluids. Major
revision is required and your manuscript will be re-reviewed.

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Sincerely,

Ali Chamkha
Journal of Nanofluids

Minor Comments are:
The reason for choosing carbon nanotubes as nanoparticles in the
nanofluid mixture should be illustrated.

Some assumptions such as incompressible flow, steady state, …
used in deriving the governing equations should be expressed.

References should be updated by recent studies in this field.

The parameters used as target parameters in the optimization
process should be explained in the introduction section.

In eq. 32, radiation parameter is denoted by N, while it is Nr in
eq. 29.

Conclusion must be rewritten in order to illustrate the main
results of the paper more quantitatively

Concerning the conclusions, some future guidelines should be
commented in a brief manner

Reviewer Report:
Manuscript ID:  21-1133.
Title of the paper:  Optimization of a proposed cooling bed with
nanoparticles for superheated sheet-metal rolling 

This paper is very much interesting. It may be accepted for
publication subject to following modifications/corrections: 
1.	Authors must correct grammatical and typographical error in
the text.
2.	Abstract should be enriched. The main goal and novelty of the
research must be clearly shown in the abstract. 
3.	Some applications of your current investigation along with
some recent references must be added. 
4.	You must provide appropriate references for governing
equations and boundary conditions. 
5.	Flow assumptions must be written point wise. 
6.	Literature review is poor. Author may consult following
research articles and incorporate its findings to update
literature survey:
1.	Hall and ion slip impacts on unsteady MHD convective rotating
flow of heat generating/absorbing second grade fluid
2.	Hall and ion slip effects on MHD rotating flow of
elastico-viscous fluid through porous medium
3.	Hall and ion slip effects on unsteady MHD free convective
rotating flow through a saturated porous medium over an
exponential accelerated plate
4.	Hall and ion slip effects on MHD rotating boundary layer flow
of nanofluid past an infinite vertical plate embedded in a porous
medium
5.	HEAT AND MASS TRANSFER ON MHD FLOW OF SECOND-GRADE FLUID
THROUGH POROUS MEDIUM OVER A SEMI-INFINITE VERTICAL STRETCHING
SHEET
6.	HALL EFFECTS ON MHD SQUEEZING FLOW OF A WATER-BASED NANOFLUID
BETWEEN TWO PARALLEL DISKS
7.	Investigations of Soret, Joule and Hall effects on MHD
rotating mixed convective flow past an infinite vertical porous
plate
8.	HEAT AND MASS TRANSFER ON MHD FREE CONVECTIVE FLOW OVER AN
INFINITE NONCONDUCTING VERTICAL FLAT POROUS PLATE
9.	HEAT AND MASS TRANSFER ON FREE CONVECTIVE FLOW OF A MICROPOLAR
FLUID THROUGH A POROUS SURFACE WITH INCLINED MAGNETIC FIELD AND
HALL EFFECTS
10.	MHD PERISTALTIC ROTATING FLOW OF A COUPLE STRESS FLUID
THROUGH A POROUS MEDIUM WITHWALL AND SLIP EFFECTS
11.	Hall effects on unsteady MHD oscillatory free convective flow
of second grade fluid through porous medium between two vertical
plates
12.	Hall effects on unsteady MHD flow of second grade fluid
through porous medium with ramped wall temperature and ramped
surface concentration
13.	HEAT AND MASS TRANSFER ON UNSTEADY, MAGNETOHYDRODYNAMIC,
OSCILLATORY FLOW OF SECOND-GRADE FLUID THROUGH A POROUS MEDIUM
BETWEEN TWO VERTICAL PLATES, UNDER THE INFLUENCE OF FLUCTUATING
HEAT SOURCE/SINK, AND CHEMICAL REACTION
14.	HEAT AND MASS TRANSFER ON MAGNETOHYDRODYNAMIC CHEMICALLY
REACTING FLOW OF A MICROPOLAR FLUID THROUGH A POROUS MEDIUM WITH
HALL EFFECTS
15.	HALL EFFECTS ON MHD PERISTALTIC FLOW OF JEFFREY FLUID THROUGH
POROUS MEDIUM IN A VERTICAL STRATUM


Acceptance is depending upon revision.

1. The authors are encouraged to consider recent related
literatures (2019-2021)

2. Is the flow laminar or turbulent? If it is laminar, it should
be clarified with any reason in assumptions. Also, in
nomenclature, the turbulent flow parameters (such as turbulent
kinetic energy, …) should be omitted. 

3. In this paper, the authors have also considered the effect of
using nanoparticles on heat transfer enhancement. It is necessary
to explain in the text that how can using nanofluid improve the
performance of the system in this case. Moreover, why carbon
nanotubes are selected among the available nanoparticles?

4. Optimization of the problem should be explained in
introduction section. Which parameters are going to be optimized?
Have these parameters contradictory effects on the system
performance?

5. Why do the temperature profiles in figs. 4-7 not approach the
free stream values asymptotically, as it can be seen in the
validation figure 3?

6. Special notation for derivatives in eq. 1-3 (, x) should be
introduced right after its first presence in the text.

7. The same form (italic of non-italic) should be used for the
variables in the equations (e.g. for u in eq. 2)

8. Specify the reference for figure 1.

9. Use similar format in writing the boundary conditions; in eqs.
4 and 5, 'zero' is inside the parenthesis, while 'infinity' sign
is outside, in eqs. 6 and 7.