Research Papers

Numerical Study of Thermofluid Characteristics of a Double Spirally Coiled Tube Heat Exchanger

[+] Author and Article Information
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

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 11(4), 041008 (Jun 17, 2019) (12 pages) Paper No: TSEA-18-1533; doi: 10.1115/1.4043849 History: Received October 22, 2018; Revised May 19, 2019

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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Fig. 1

Schematic diagram of a double spirally coiled tube heat exchanger

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Fig. 2

Grid system for double spirally coiled tube heat exchanger

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Fig. 3

Grid density versus Nu and f for both inner and annular sides

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Fig. 4

Nusselt number and friction factor versus inner and outer Reynolds number

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Fig. 5

Effect of Al2O3 nanofluid concentration on Nusselt number

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Fig. 6

Effect of Al2O3 nanofluid concentration on convection heat transfer coefficient

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Fig. 7

Effect of Al2O3 nanofluid concentration on friction factor

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Fig. 8

Nusselt number versus Dean number at different coil curvature ratios

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Fig. 9

friction factor versus Dean number at different coil curvature ratios

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Fig. 10

Convective heat transfer coefficient per unit length versus Dean number at different curvature ratios

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Fig. 11

Contours of static temperature (° C) at different coils

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Fig. 12

Contours of flow pattern at different double spiral tube heat exchangers: (a) contours of velocity magnitude (m/s) and (b) contours of axial velocity (m/s)

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Fig. 13

Heat transfer per unit pumping power versus Reynolds number at different coil curvature ratios

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Fig. 14

Variation of performance index with Reynolds number



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