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Investigating the effect of connection type of a sintered porous fin through a channel on heat transfer and fluid flow

  • Mehrdad Mesgarpour
  • Ali Heydari
  • Seyfollah Saddodin
Article

Abstract

Extended surfaces represent one of practical approaches to enhance heat transfer. Based on the laws of conductive and convective heat transfer, an increase in the area across which the object is in contact with the fluid can increase heat transfer. Due to its special structure, porous media can be seen as suitable alternatives for extended surface applications. On this basis, this research investigates the effect of connection type of sintered porous fins on heat transfer and pressure drop in the fluid flow. Connection model of four- and six-contact sintered balls of constant dimensions was evaluated by means of CFD simulation in this research. To describe the problem further, surface analysis on the reference cube is presented. The results indicate that the six-contact model has more porosity than the four-contact in reference cube by 29.45%. It was further found that the six-contact model tends to increase convective heat transfer by 33%. Results of surface analysis show that the main reasons for the difference in heat transfer between the four- and six-contact models are porosity and the angle at which balls are arranged with another.

Keywords

Sintered fin Porosity Connection type Surface analysis 

List of symbols

A

Surface area (m2)

Cp

Specific heat (J kg K−1)

dp

Ball diameter (m)

Dh,ch

The hydraulic diameter of the channel

Gk

Turbulence kinetic energy generated due to velocity (W)

GB

Turbulence kinetic energy generated due to body force (W)

h

Heat transfer coefficient (W m−2 K)

H

Enthalpy (J)

K

Thermal conductivity (W m k−1)

k

Kinetic energy (J kg−1)

L

Fin length (m)

\(\dot{m}\)

Mass flow rate (kg s−1)

Nu

Nusselt number

P

Pressure (pa)

ΔP

Pressure drop (Pa)

\(\dot{Q}\)

Heat transfer (w)

Re

Reynolds number

S

Source term

T

Temperature (K)

U

Fluid velocity (m s−1)

YM

Turbulence density

Greek symbols

ε

Energy dissipation (J kg−1)

μ

Absolute viscosity (N s m−2)

η

Thermal efficiency

ρ

Density (kg m−3)

σ

Turbulent Prandtl number

θ

Dimensionless temperature

Subscripts

f

Fluid

s

Solid surface

w

Wall

cond

Conduction

conv

Convection

total

Total

LMTD

Logarithmic average of the temperature difference

in

Inlet

out

Outlet

fin

Related to fin

ave

Average

b

Base

i

Interface of solid and liquid

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Semnan BranchIslamic Azad UniversitySemnanIran
  2. 2.Energy and Sustainable Development Research Center, Semnan BranchIslamic Azad UniversitySemnanIran

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