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Research Papers: Thermal Systems

Experimental Study About Performance Analysis of Parallel Connected Ranque–Hilsch Counter Flow Vortex Tubes With Different Nozzle Numbers and Materials

[+] Author and Article Information
Hüseyin Kaya

Faculty of Engineering,
Mechanical Engineering,
Bartin University,
Bartin 74100, Turkey
e-mail: hkaya@personel.bartin.edu.tr

Fahrettin Günver

Graduate School of Natural and
Applied Sciences,
Mechanical Engineering,
Bartin University,
Bartin 74100, Turkey
e-mail: fgunver42@gmail.com

Onuralp Uluer

Faculty of Technology,
Manufacturing Engineering,
Gazi University,
Ankara 06503, Turkey
e-mail: uluer@gazi.edu.tr

Volkan Kırmacı

Faculty of Engineering,
Mechanical Engineering,
Bartin University,
Bartin 74100, Turkey
e-mail: volkankirmaci@gmail.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 7, 2018; final manuscript received June 21, 2018; published online July 23, 2018. Assoc. Editor: Amitabh Narain.

J. Heat Transfer 140(11), 112801 (Jul 23, 2018) (8 pages) Paper No: HT-18-1134; doi: 10.1115/1.4040707 History: Received March 07, 2018; Revised June 21, 2018

An experimental analysis for parallel connected two identical counter flow Ranque–Hilsch vortex tubes (RHVT) with different nozzle materials and numbers was conducted by using compressed air as a working fluid in this paper. Heating and cooling performance of vortex tube system (circuit) and the results of exergy analysis are researched comprehensively according to different inlet pressure, nozzle numbers, and materials. Nozzles made of polyamide plastic, aluminum, and brass were mounted into the vortex tubes individually for each case of experimental investigation with the numbers of nozzles 2, 3, 4, 5, and 6. The range of operated inlet pressure 150–550 kPa with 50 kPa variation. The ratio of length–diameter (L/D) of each vortex tube in the circuit is 14 and the cold mass fraction is 0.36. Coefficient of performance (COP) values, heating, and cooling capacity of the parallel connected RHVT system were evaluated. Further, an exergy analysis was carried out to evaluate the energy losses and second law efficiency of the vortex tube circuit. The greatest thermal performance was obtained with aluminum-six-nozzle when taking into account all parameters such as temperature difference, COP values, heating and cooling capacity, and exergy analysis.

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References

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Figures

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Fig. 3

Different material nozzles (polyamide plastic, aluminum, and brass)

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Fig. 2

Testing system display

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Fig. 4

Cold outlet temperatures versus inlet pressure and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 5

Hot outlet temperature versus inlet pressure and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 6

Overall temperature difference (ΔT) versus inlet pressure and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 7

Heating capacity according to pressure ratio and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 8

Cooling capacity according to pressure ratio and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 9

COPR values according to pressure ratio and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 10

COPHP values according to pressure ratio and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 11

Inlet specific exergy versus inlet pressure and nozzle number

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Fig. 12

Outlet specific exergy versus inlet pressure and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 1

The separation of hot and cold streams in a counter flow RHVT

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Fig. 13

Specific loss exergy versus inlet pressure and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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Fig. 14

Exergy efficiency variation according to inlet pressure and nozzle number for (a) polyamide plastic, (b) aluminum, and (c) brass

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