Numerical Simulation of Heat Transfer Performance of a Dimpled Tubular Heat Exchanger

Round 1

Reviewer 1 Report

·             English use throughout the entire manuscript is very poor. Text style seems to be a telegram. Please, ask a native English speaker for the improvement of the manuscript.
-the similarity rate of the manuscript exceeds the normal range, modify this.

·             At several places in the text, the word spacing has not been taken care of.  Insert space after every comma and full stop. Typographic errors and word spacing can be fixed in the revised version for running a spell check.

·             The wordings, sentences, and grammar throughout the text should be well polished.

·             More explanation about the figure should be added in the text for revealing the physics. More physics of results are required with expanded explanations.

·             What is the main practical contribution of your work? Elaborate in the concussion.

·             The results are superficial. The authors should try to provide more explanations

·             The authors must revise their manuscript in terms of language usage

·             The literature review is not comprehensive. These references can strengthen the introduction:

·             It is noted that your manuscript needs careful editing in English grammar and sentence structure.

·             The literature is incomplete. The studies below have investigated the same or similar problem and may be cited: Energy efficiency optimization of the waste heat recovery system with embedded phase change materials in greenhouses: a thermo-economic-environmental study Numerical investigation of turbulent flow and heat transfer of nanofluid inside a wavy microchannel with different wavelengths CFD analysis of thermal and hydrodynamic characteristics of hybrid nanofluid in a new designed sinusoidal double-layered microchannel heat sink Heat and fluid flow analysis of metal foam embedded in a double-layered sinusoidal heat sink under local thermal non-equilibrium condition using nanofluid

Author Response

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Author Response File: Author Response.docx

Reviewer 2 Report

The authors numerically studied turbulent flow and heat transfer performance of a tubular heat exchanger containing a dimpled inner tube using CFD software Fluent. They analyzed the influence of the inner tubes with different sizes of dimple concave and protrusion on the heat transfer capacity of both tube side and shell side of tubular heat exchangers.

Comments:

1. The introduction is not enough. Authors must provide the background of research in detail. The literature review is inadequate.

2. Motivation of the present problem is not clearly given. It should be explained in the last paragraph of introduction section.

3. Explain the physical model in detail (in sec 2).

4. The authors just stated “CFD method’ is used.  Please provide more details about the solution methodology, like, convergence.

6. What are the values of Nusselt number for different grids in grid test. Give in a table.

7. Correct the figure caption “Figure 7. The variation of Nusselt number Nu number in shell with Re.”. Delete “Nu number”, which is repeated.

8. Why the authors take Re values from 10000 to 60000? Is there any specific reason? If we choose other values of Re, that is Re greater than 60000 (>60000), what about the results?

8. Add nomenclature for all symbols.

Author Response

Please see the attachment

Author Response File: Author Response.docx