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Convective drying of a moist porous object under the effects of a rotating cylinder in a channel

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Abstract

Numerical study of evaporation in porous medium during convective drying process was examined, and heat and mass transfer of liquid water and water vapor through porous media was investigated by using the Galerkin weighted residual finite element method. The porous moist object has a rectangular shape and is assumed to represent a food sample. Two-dimensional laminar flow of dry hot air was used in the channel with a rotating circular cylinder. Different locations and angular rotational speed of the rotating cylinder were considered to control the convective heat transfer and mass transportation. The radius of rotating cylinder and velocity of drying air were also varied with five different values. Results showed that rotational angular speed and drying air velocity had significant effect on heat transfer and mass transport phenomenon for the porous moist object.

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Abbreviations

c p :

Specific isobaric heat capacity (kJ kg−1 K−1)

c :

Concentration

D :

Diffusivity (m2 s−1)

h :

Convective heat transfer coefficient (W m−2 K−1)

H evap :

Heat of evaporation (J mol−1)

\(\vec{I}\) :

Identity vector

k :

Thermal conductivity (W m−1 K−1)

L, l :

Length (mm)

M :

Molar mass (kg mol−1)

m evap :

Mass of evaporation (mol m−3 s−1)

n :

Mass flux (kg m−2 s−1)

P, p :

Pressure (Pa)

R :

Universal gas constant (J mol−1 K−1)

R evap :

Evaporation rate (kg m−3 s−1)

r :

Radius (mm)

s :

Surface area (m2)

S :

Saturation

T :

Temperature (K)

t :

Time (min)

q :

Heat flux (kJ m−2 s−1)

\(\vec{u}\) :

Velocity vector

V :

Volume (m3)

x :

x coordinate (mm)

y :

y coordinate (mm)

ρ :

Density (kg m−3)

ε :

Porosity

κ :

Permeability

μ :

Dynamic viscosity

τ :

Tortuosity

a:

Air

c:

Capillary

eff:

Effective

evap:

Evaporation

g:

Gas

l:

Liquid

ma:

Moist air

p:

Pressure

r:

Relative

s:

Solid

sat:

Saturation

v:

Vapor

w:

Water

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Acknowledgements

This study was supported by the scientific and technological research council of Turkey—TUBITAK under the Grant No: 119M050 which is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Celal Bayar University, Manisa, Turkey

    Fatih Selimefendigil & Seda Özcan Çoban

  2. Department of Mechanical Engineering, Technology Faculty, Fırat University, Elazig, Turkey

    Hakan F. Öztop

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  1. Fatih Selimefendigil
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  2. Seda Özcan Çoban
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  3. Hakan F. Öztop
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Correspondence to Fatih Selimefendigil.

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Selimefendigil, F., Özcan Çoban, S. & Öztop, H.F. Convective drying of a moist porous object under the effects of a rotating cylinder in a channel. J Therm Anal Calorim 141, 1569–1590 (2020). https://doi.org/10.1007/s10973-019-09140-5

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