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Experimental study of an upward sub-cooled forced convection in a rectangular channel

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Abstract

The upward sub-cooled forced convection in a rectangular channel is investigated experimentally. The aim of the present work is the studying of the local heat transfer phenomena. Concerning the experimentation: the n-pentane is used as a working fluid, the independent variables are: the velocity in the range from 0.04 to 0.086 m/s and heat flux density with values between 1.8 and 7.36 W/cm2. The results show that the local Nusselt number distribution is not uniform along the channel; however, uniformity is observed in the mean Nusselt number for Reynolds under 1600. On the other hand, a new correlation to predict the local fluid temperature is established as a function of local wall temperature. The wall’s heat is dissipated under the common effect of the sub-cooled regime; therefore, the local heat transfer coefficient is increased. The study of the thermal equilibrium showed that for Reynolds less than 1500; almost all of the heat flux generated by the heater cartridges is absorbed by the fluid.

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Abbreviations

CI:

Confidence interval (–)

Cp :

Specific heat (J/kg °C)

Dh :

Hydraulic diameter (m)

k:

Thermal conductivity (W/m K)

L:

Channel length (m)

m:

Flow rate (kg/s)

h:

Heat transfer coefficient (W/m2 °C)

Nu:

Nusselt number

Q:

Heat flux (W)

Re:

Reynolds number (–)

S:

Heat transfer surface (m2)

T:

Temperature (°C)

V:

Velocity (m/s)

X:

Position (m)

f:

Fluid

w:

Wall

elec:

Electrical

ther:

Thermal

in:

Inlet

out:

Outlet

a:

Average

l:

Local

Δ:

Differential

σ:

Standard deviation

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Authors and Affiliations

  1. Laboratory of Multiphase Transport and Porous Media (LTPMP), Faculty of Mechanical and Process Engineering (FGMGP), USTHB, BP 32, El Alia, Algiers, Algeria

    A. Kouidri, B. Madani, B. Roubi & A. Hamadouche

Authors
  1. A. Kouidri
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  2. B. Madani
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  3. B. Roubi
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  4. A. Hamadouche
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Correspondence to A. Kouidri.

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Kouidri, A., Madani, B., Roubi, B. et al. Experimental study of an upward sub-cooled forced convection in a rectangular channel. Heat Mass Transfer 52, 1321–1328 (2016). https://doi.org/10.1007/s00231-015-1656-6

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  • DOI: https://doi.org/10.1007/s00231-015-1656-6

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