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Convective heat transfer and pressure drop in V-corrugated channel with different phase shifts

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Abstract

New energy system development and energy conservation require high performance heat exchanger, so the researchers are seeking to find new methods to enhance heat transfer mechanism in heat exchangers. The objectives of this study are investigating heat transfer performance and flow development in V-corrugated channels, numerical simulations were carried out for uniform wall heat flux equal 290 W/m2 using air as a working fluid, Reynolds number varies from 500 to 2,000, phase shifts, 0° < Ø < 180°, and channel heights (S = 12.5, 15.0, 17.5 and 20 mm). Governing equations of flow and energy were solved numerically by using finite volume method. The numerical results indicated that, wavy (V-corrugated) channels have a significant impact on heat transfer enhancement with increase in pressure drop though channel due to breaking and destabilizing in the thermal boundary layer are occurred as fluid flowing through the corrugated surfaces and the effect of corrugated phase shift on the heat transfer and fluid flow is more significant in narrow channel, the goodness factor (j/f) was increased with increasing channel phase shift, the best performance was noticed on phase shift, Ø = 180° and channel height, S = 12.5 mm.

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Abbreviations

PRESTO:

Pressure staggering option

RNG:

Renormalized group

SIMPLE:

Semi-implicit method for pressure-linked equations

UDF:

User defined function

A:

Height of the wavy (mm)

Cp :

Specific heat (J/kg K)

Cε :

Turbulent model constant

Cμ :

Turbulent model constant

Dh :

Hydraulic diameter (mm)

f :

Friction factor

h:

Heat transfer coefficient (W/m2 K)

I:

Turbulent intensity

j:

Colburn factor [Nu/(Re Pr^(1/3))]

k:

Thermal conductivity of the fluid (W/m K)

L:

Length of the domain (mm)

\(\dot{m}\) :

Mass flow rate (kg/s)

P:

Wavy pitch (mm)

p:

Pressure (Pa)

Q:

Heat transfer rate (kW)

q:

Heat flux (W/m2)

Pr:

Prandtl number (Pr = Cpμ/k)

Qin :

Heat input rate (W)

Re:

Reynolds number (Re = ρuavDh/µ)

S:

Channel spacing (mm)

T:

Temperature

u:

Velocity component at x-direction (m/s)

v:

Velocity component at y-direction (m/s)

w:

Width (mm)

y+ :

Dimensionless distance from the cell center to the nearest wall

δ:

Height of the base (mm)

ε:

Dissipation kinetic energy (m2/s3)

θ:

Wavy angle

μ:

Dynamic viscosity of the fluid (Pa s)

ρ:

Air density (kg/m3)

σ:

Length of corrugated (mm)

σk :

Diffusion Prandtl number for k

τs :

Wall shear stress

ν:

Kinematic viscosity of the fluid (m2/s)

Ø:

Phase shift

a:

Air

av:

Average

i:

Inlet

m:

Mean value

o:

Outlet

t:

Total

w:

Wall

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Authors and Affiliations

  1. Civil Engineering, Architecture and Building (CAB), Faculty of Engineering and Computing, Coventry University, Coventry, CV1 5FB, UK

    Mohamed Sakr

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  1. Mohamed Sakr
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Correspondence to Mohamed Sakr.

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Sakr, M. Convective heat transfer and pressure drop in V-corrugated channel with different phase shifts. Heat Mass Transfer 51, 129–141 (2015). https://doi.org/10.1007/s00231-014-1390-5

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  • DOI: https://doi.org/10.1007/s00231-014-1390-5

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