Abstract
Simultaneous heat and mass transfer inside a packed bed dryer between a fluid phase and corn kernels was studied. A developed two-phase model for evaluating the effect of bed shrinkage and non-constant physical properties on the drying efficiency was conducted. Experimental data were utilized to develop the governing equations of the bed shrinkage and structural parameters with moisture content inside the packed bed dryer. The developed model was verified by assessing predictions against experimentally obtained moisture content and temperature along the drying bed, as the standard errors of the experimental values compared to the model were found to be close to the accepted engineering accuracy of 5%. It has been concluded that the incorporation of bed shrinkage and alteration in properties within the operating model is capable of providing a more comprehensive and precise analysis of heat and mass transfer phenomenon in porous media drying, such as corn kernels.
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Abbreviations
- C pg :
-
Air-specific heat (J kg−1 K−1)
- C ps :
-
Solid-specific heat (J kg−1 K−1)
- d :
-
Particle diameter (m)
- F m :
-
Mass flux (kg m−2 s−1)
- H :
-
Height of the packed bed (m)
- h sg :
-
Convective heat transfer coefficient at the solid–air interface (W m−2 K−1)
- h 0 :
-
Heat transfer coefficient at the inlet of the bed (W m−2 K−1)
- h 1 :
-
Heat transfer coefficient at the outlet of the bed (W m−2 K−1)
- \(K_{\exp }\) :
-
Experimental value (–)
- \(K_{\bmod }\) :
-
Model value (–)
- \(\mathop m\limits^{ \bullet }\) :
-
Evaporation rate (kg m−3 s−1)
- \(n\) :
-
Number of observations (–)
- r :
-
Particle radius (m)
- RH:
-
Relative humidity (%)
- A :
-
Specific surface area (m−1)
- S b :
-
Shrinkage coefficient ratio (–)
- t :
-
Time (s)
- T :
-
Temperature (K)
- V g :
-
Air velocity (m s−1)
- X :
-
Moisture content (kg/kg)
- z :
-
Axial coordinate (m)
- \(\nabla\) :
-
Standard error (%)
- \(\Delta H\) :
-
Latent heat of vaporization (J kg−1)
- ρ :
-
Density (kg m−3)
- λ :
-
Thermal conductivity (W m−1 K−1)
- λ g eff :
-
Effective thermal conductivity of the gas phase (W m−1 K−1)
- λ s eff :
-
Effective thermal conductivity of the solid phase (W m−1 K−1)
- Φ :
-
Humidity (–)
- ε :
-
Porosity (–)
- g:
-
Gas phase
- eff:
-
Effective
- eq:
-
Equilibrium
- s:
-
Solid phase
- sg:
-
Solid–gas interface
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The authors would like to express their sincere appreciation to the research team that we are a part of and to the Energy and Thermal Transfers Laboratory, Faculty of Sciences of Tunis for their assistance in laboratory experiments.
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Kraiem, A., Madiouli, J., Sghaier, J. et al. Significance of Bed Shrinkage on Heat and Mass Transfer During the Transport Phenomenon of Humid Air. Arab J Sci Eng 46, 6085–6099 (2021). https://doi.org/10.1007/s13369-021-05444-7
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DOI: https://doi.org/10.1007/s13369-021-05444-7