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Heat-transfer enhancement of two-phase closed thermosyphon using a novel cross-flow condenser

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Abstract

The present study reports the heat-transfer performance of a two-phase closed thermosyphon (TPCT) equipped with a novel condenser. Distillated water was used as working fluid, with a volumetric liquid filling ratio of 75 %. An increase in heat flux was used to measure the response of the TPCT, including variations in temperature distribution, thermal resistance, average temperature of each section of TPCT and overall thermal difference. Results show that for various power inputs from 71 to 960 W, the TPCT with the novel condenser had a lower wall-temperature difference between the evaporator and condenser sections than did the unmodified TPCT. Given the experimental data for heat-transfer performance, it was found that the thermal resistance in the TPCT equipped with the proposed condenser was between 10 and 17 % lower than in the one without.

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Abbreviations

Cp:

Constant pressure specific heat (J/kg K)

d:

Hydraulic diameter (m)

I:

Current (A)

L:

Condenser height (m)

g:

Gravitational constant (m/s2)

hfg :

Latent heat of vaporization (J/kg)

m:

Mass flow rate (kg/s) or (g/s)

P:

Pressure (Pa) or (kPa)

R:

Thermal resistance (°C/W)

Q:

Heat rate (W)

T:

Temperature (°C)

h:

The convective heat transfer coefficient (W/m2K)

k:

The thermal conductivity (W/m K)

V:

Voltage (V)

υ:

Kinematic viscosity (m2/s)

ρ:

Density (kg/m3)

µ:

Dynamic viscosity (Pa s)

η:

Efficiency of TPCT

w:

Liquid water

g:

Gas phase

sat:

Saturate

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Authors and Affiliations

  1. Faculty of Energy, Kermanshah University of Technology, Kermanshah, Iran

    Babak Aghel

  2. Chemical Engineering Department, CFD Research Center, Razi University, Taghebostan, Kermanshah, Iran

    Masoud Rahimi & Saeed Almasi

Authors
  1. Babak Aghel
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  2. Masoud Rahimi
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  3. Saeed Almasi
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Correspondence to Masoud Rahimi.

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Aghel, B., Rahimi, M. & Almasi, S. Heat-transfer enhancement of two-phase closed thermosyphon using a novel cross-flow condenser. Heat Mass Transfer 53, 765–773 (2017). https://doi.org/10.1007/s00231-016-1858-6

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  • DOI: https://doi.org/10.1007/s00231-016-1858-6

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