In this study, the thermofluid characteristics of double spirally coiled tube heat exchanger (DSCTHE) were investigated numerically. A three-dimensional (3D) computational fluid dynamic (CFD) model was developed using ansys 14.5 software package. To investigate the heat transfer and pressure drop characteristics of DSCTHE, the Realize k–ε turbulence viscous model had been applied with enhanced wall treatment for simulating the turbulent thermofluid characteristics. The governing equations were solved by a finite volume discretization method. The effect of coil curvature ratio on DSCTHE was investigated with three various curvature ratios of 0.023–0.031 and 0.045 for inner tube side and 0.024–0.032–0.047 for annular side. The effects of addition of Al2O3 nanoparticle on water flows inside inner tube side or annular side with different volume concentrations of 0.5%, 1%, and 2% were also presented. The numerical results were carried out for Reynolds number with a range from 3500 to 21,500 for inner tube side and from 5000 to 24,000 for annular side, respectively. The obtained results showed that with increasing coil curvature ratio, a significant effect was discovered on enhancing heat transfer in DSCTHE at the expense of increasing pressure drop. The results also showed that the heat transfer enhancement was increased with increasing Al2O3 nanofluid concentration, and the penalty of pressure drop was approximately negligible.
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August 2019
Research-Article
Numerical Study of Thermofluid Characteristics of a Double Spirally Coiled Tube Heat Exchanger
Mahmoud Abdelmagied
Mahmoud Abdelmagied
Department of Refrigeration and Air
Conditioning Technology,
Faculty of Industrial Education,
Helwan University,
Cairo 11282, Egypt
e-mail: mahmoudabdelmagied@ tecedu.helwan.edu.eg
Conditioning Technology,
Faculty of Industrial Education,
Helwan University,
Cairo 11282, Egypt
e-mail: mahmoudabdelmagied@ tecedu.helwan.edu.eg
1Corresponding author.
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Mahmoud Abdelmagied
Department of Refrigeration and Air
Conditioning Technology,
Faculty of Industrial Education,
Helwan University,
Cairo 11282, Egypt
e-mail: mahmoudabdelmagied@ tecedu.helwan.edu.eg
Conditioning Technology,
Faculty of Industrial Education,
Helwan University,
Cairo 11282, Egypt
e-mail: mahmoudabdelmagied@ tecedu.helwan.edu.eg
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received October 22, 2018; final manuscript received May 19, 2019; published online June 17, 2019. Assoc. Editor: Ali J. Chamkha.
J. Thermal Sci. Eng. Appl. Aug 2019, 11(4): 041008 (12 pages)
Published Online: June 17, 2019
Article history
Received:
October 22, 2018
Revised:
May 19, 2019
Citation
Abdelmagied, M. (June 17, 2019). "Numerical Study of Thermofluid Characteristics of a Double Spirally Coiled Tube Heat Exchanger." ASME. J. Thermal Sci. Eng. Appl. August 2019; 11(4): 041008. https://doi.org/10.1115/1.4043849
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