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Heat transfer characteristics of a two-phase closed thermosyphon using different working fluids

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Abstract

In this paper, an enhanced FORTRAN code was combined with the EES software to predict the vapor flow thermal resistance effects on the heat transfer characteristics of a two- phase closed thermosyphon (TPCT). Different refrigerants such as water, ammonia, R-11, R-22 and R-134a were tested. Also an enhanced time integration scheme was recommended for solving the governing equations in FORTRAN code.

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Abbreviations

A :

Conductor cross-sectional area (m2)

AR:

Aspect ratio

c P :

Specific heat (J/(kg K))

D :

Diameter (m)

FR:

Filling ratio

h :

Heat transfer coefficient (W/m2K)

k :

Thermal conductivity (W/mK)

L :

Length (m)

P :

Pressure (Pa)

Q :

Heat transfer rate (W)

T :

Temperature (K)

TPCT:

Two-phase closed thermosyphon

α :

Thermal diffusivity (m2/s)

ρ :

Density (kg/m3)

λ:

Length (m)

:

Environment

a:

Adiabatic section

i1 or i2:

End of heat conductor i

c:

Condenser

e:

Evaporator

f:

Fluid

i:

Component number of the heat pipe

in:

Inner

n :

Time step

m :

Mean

sat:

Saturation state

out:

Outer

v:

Vapor

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Correspondence to Behrooz Mirzaei Ziapour.

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Ziapour, B.M., Shaker, H. Heat transfer characteristics of a two-phase closed thermosyphon using different working fluids. Heat Mass Transfer 46, 307–314 (2010). https://doi.org/10.1007/s00231-009-0570-1

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  • DOI: https://doi.org/10.1007/s00231-009-0570-1

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