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Research Papers

Size Effect on Thermal Characteristic of Tubular Heat Exchanger at Miniscale and Microscale

[+] Author and Article Information
Ankush D. Tharkar

Department of Aerospace Engineering,
Indian Institute of Technology Bombay,
Powai, Mumbai 400076, India
e-mail: ankush.tharkar@aero.iitb.ac.in

Shripad P. Mahulikar

Professor
Department of Aerospace Engineering,
Indian Institute of Technology Bombay,
Powai, Mumbai 400076, India
e-mail: spm@aero.iitb.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 20, 2018; final manuscript received September 13, 2018; published online October 26, 2018. Assoc. Editor: Cheng-Xian Lin.

J. Thermal Sci. Eng. Appl 11(2), 021001 (Oct 26, 2018) (10 pages) Paper No: TSEA-18-1147; doi: 10.1115/1.4041492 History: Received March 20, 2018; Revised September 13, 2018

The scope for the heat transfer enhancement in the tubular heat exchanger is high due to its unique property of having two separate convective heat transfer coefficients. The variation of diameter and annular space has a direct effect on the value of convective heat transfer coefficients due to their inverse relation. Thus, the strong emphasis must be given on the influence of diameter and annular space on the thermal characteristics of the tubular heat exchanger. In this numerical analysis, peculiarities in the improvement of the performance parameters are studied with the variation in the value of inlet velocities of the fluids (cold and hot), inner pipe diameter, and annular space for the combination of dimensional range such as miniscale and microscale range. The inner tube diameter is observed to be sensitive to the improvement in the performance parameter. The growth in the performance parameter of the tubular micro heat exchanger is found to be higher when both the values of diameter and annular space are in the microscale range.

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References

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Figures

Grahic Jump Location
Fig. 2

Effectiveness variation with D and dann for subcase (A) of case I

Grahic Jump Location
Fig. 6

Volumetric heat transfer coefficient variation with D and dann for subcase (A) of case I

Grahic Jump Location
Fig. 7

Volumetric heat transfer coefficient variation with D and dann for subcase (B) of case I

Grahic Jump Location
Fig. 9

Effectiveness variation with D and dann for subcase (B) of case II

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Fig. 10

MTD variation with D and dann for subcase (B) of case II

Grahic Jump Location
Fig. 8

Effectiveness variation with D and dann for subcase (A) of case II

Grahic Jump Location
Fig. 3

MTD variation with D and dann for subcase (A) of case I

Grahic Jump Location
Fig. 4

Effectiveness variation with D and dann for subcase (B) of case I

Grahic Jump Location
Fig. 5

MTD variation with D and dann for subcase (B) of case I

Grahic Jump Location
Fig. 1

Schematic of discretized parallel flow tubular micro heat exchanger

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