Numerical simulation of a plate-fin heat exchanger with offset fins using porous media approach
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In this paper, the study was focused on a double flow plate-fin heat exchanger (PFHE) whose heat transfer element was offset staggered fin. Numerical simulations have been carried out to investigate the thermodynamic characteristics of a full-size PFHE via the porous media approach. Based on the numerical model, the effects of the dynamic viscosity and the locations of the inlet and outlet tubes on flow distribution and pressure drop of the PFHE were studied. The results showed that flow distribution of the PFHE was improved by increasing the dynamic viscosity. Therefore, the relationship between flow distribution and pressure drop was analyzed under various inlet velocity, and a correlation among flow distribution, pressure drop, and Reynolds number was derived. Finally, the middle-based strategy was proposed and numerically verified to improve flow distribution of the PFHE.
Total heat transfer area, (m2).
The diagonal coefficient.
Inertial resistance factor, dimensionless.
Specific heat at constant pressure, (J/kg K).
Hydraulic diameter, =4AcL/A0.
Friction factor, dimensionless
Fin height, (mm)
Convective heat transfer coefficient of the medium, (W/m2 K)
Turbulence kinetic energy
Colburn factor, dimensionless
Offset value, (mm)
Depth of the heat exchanger in flow direction, (mm)
Mass flow rate of fluid, ( kg/s)
Fin frequency, fins per meter
Number of fin layers for fluid
Nusselt number, dimensionless
Number of transfer units
Prandtl number, dimensionless
Total heat transfer rate, (W)
The maximum possible heat transfer rate,(W)
Reynolds number, dimensionless
Standard deviation, (%)
Fin width, (mm)
Fin thickness, (mm)
Effective volume, (mm3)
The total volume, (mm3)
Face velocity for the j th (x, y, or z) direction, , (m/s)
The magnitude of the velocity, (m/s)
Fin wrinkling angle, (°)
Permeability , dimensionless
Pressure drop, (Pa)
Temperature difference, (K)
The porous media thickness, (mm)
Turbulence dissipation funchion
Thermal, (W/m K)
Fin surface efficiency
Dynamic viscosity, (N s/m2)
This work is supported by the Key Projects of Science and Technology in Jiangxi Province Department of Education (Project No.GJJ161134).
- 1.Kays WM, London A (1984) Compact heat exchanger, 3rd edn. McGraw-Hill, New YorkGoogle Scholar
- 2.Chu P, He YL (2009) Three-dimensional numerical study of flow and heat transfer enhancement using vortex generators in fin-and-tube heat exchangers[J]. J Heat Trans 131Google Scholar
- 3.Shah RK, Heikal MR, Thonon B et al (2001) Progress in the numerical analysis of compact heat exchanger surfaces. Adv Heat Transf [M] New York, Academic Press 34:363–443Google Scholar
- 6.Mao YW, Ching YH (2009) Heat-transfer enhancement in fin-and-tube heat exchanger with improved fin design [J]. Int J Appl Thermal Eng 29(5–6):1050–1057Google Scholar
- 8.Patankar SV, Spalding DB (1974) Heat exchanger design theory source book. New York:McGraw-Hill Book CompanyGoogle Scholar
- 10.Sandeep K, Vigneshkumar N, et al. (2016) Computational and experimental study of fluid flow and heat flow characteristics in porous media, IOP Conf Ser:Mater Sci Eng 149:012222Google Scholar
- 19.Manglik RM, Bergles AE (1990) The thermal-hydraulic design of the rectangular offset-strip-fin compact heat exchanger, Eds.Hemisphere, New York p 123-149Google Scholar
- 27.Khan Y, Wu Q et al (2012) Heat transfer analysis on the MHD flow of a non-Newtonian fluid in the presence of thermal radiation: An analytic solution. Zeitschrift fur Naturforschung, A 67a:147–152Google Scholar