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Heat and Mass Transfer

, Volume 54, Issue 3, pp 745–755 | Cite as

Numerical simulation of a plate-fin heat exchanger with offset fins using porous media approach

  • Du Juan
  • Zhao Hai-Tao
Original
  • 172 Downloads

Abstract

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.

Nomenclature

A

Total heat transfer area, (m2).

C

The diagonal coefficient.

C2

Inertial resistance factor, dimensionless.

CP

Specific heat at constant pressure, (J/kg K).

D

Diagonal matrix.

Dh

Hydraulic diameter, =4AcL/A0.

f

Friction factor, dimensionless

  H

Fin height, (mm)

h

Convective heat transfer coefficient of the medium, (W/m2 K)

k

Turbulence kinetic energy

j

Colburn factor, dimensionless

lf

Offset value, (mm)

L

Depth of the heat exchanger in flow direction, (mm)

m

Mass flow rate of fluid, ( kg/s)

n

Fin frequency, fins per meter

N

Number of fin layers for fluid

Nu

Nusselt number, dimensionless

NTU

Number of transfer units

Pr

Prandtl number, dimensionless

Q

Total heat transfer rate, (W)

Qmax

The maximum possible heat transfer rate,(W)

Re

Reynolds number, dimensionless

S

Source term

STD

Standard deviation, (%)

s

Fin width, (mm)

T

Temperature, (K)

t

Fin thickness, (mm)

U

Velocity vector

Vp

Effective volume, (mm3)

Vb

The total volume, (mm3)

vj

Face velocity for the j th (x, y, or z) direction, , (m/s)

|v|

The magnitude of the velocity, (m/s)

Greek symbols

α

Fin wrinkling angle, (°)

α

Permeability , dimensionless

Γ

Diffusion coefficient

 ∆P

Pressure drop, (Pa)

T

Temperature difference, (K)

 ∆n

The porous media thickness, (mm)

ε

Turbulence dissipation funchion

λ

Thermal, (W/m K)

  η

Fin surface efficiency

μ

Dynamic viscosity, (N s/m2)

ρ

Density, (kg/m3)

ϕ

Porosity, (%)

φ

General variable

Subscripts

1

Air side

2

Oil side

atm

Atmosphere

avg

Average

c

Cold side

h

Hot side

i,j

Serial number

in

Inlet

m

Mean value

min

Minimum value

max

Maximum value

out

Outlet

Notes

Acknowledgements

This work is supported by the Key Projects of Science and Technology in Jiangxi Province Department of Education (Project No.GJJ161134).

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Collaborative Innovation Center of Automobile Service Engineering and Industrial UpgradingJiangxi Institute of TechnologyNanchangChina

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