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Convective and radiant drying of a polymer aqueous solution

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Abstract

The aim of this work is to minimize the drying time of a polymer aqueous solution placed into a Petri dish while respecting strict constraints. Several experiments performed in a laboratory setup have shown the interest of a drying combining convective and infrared radiation as long as irradiation is correctly controlled. In this way, a one dimensional liquid diffusion model taking into account the product shrinkage was developed. Model predictions are in good adequacy to mass and temperature experimental data.

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Abbreviations

a w :

water activity

C p :

specific heat (J kg–1 K−1)

D :

diffusion coefficient (m2 s−1)

e :

thickness (m)

E a :

activation energy (J mol−1)

F m :

drying rate (kg m−2 s−1)

h :

convective heat-transfer coefficient (W m−2 K−1)

H air :

relative humidity (%)

k m :

mass-transfer coefficient (m s−1)

L v :

latent heat of vaporization (J kg−1)

m :

mass of the product (kg)

M v :

molecular weight (kg mol−1)

P IR :

infrared irradiation (W m−2)

P vsat :

saturated water vapor pressure (Pa)

P va :

air vapor pressure (Pa)

Q IR :

volume infrared power (W m−3)

R :

gas constant (J K−1 mol−1)

t :

time (s)

T :

temperature (K)

v :

velocity (m s−1)

X :

moisture content (kg kg−1)

z :

coordinate (m)

ε :

emissivity

ψ :

linear shrinkage coefficient

κ :

extinction coefficient

λ :

thermal conductivity (W m−1 K−1)

ρ :

density (kg m−3)

τ :

transmissivity

σ :

Stefan–Boltzmann constant (W m−2 K−4)

ξ :

dimensionless space coordinate

+ :

Petri dish

d:

dried product

m:

mean value

p:

product

w:

water

i:

initial

f:

final

u:

upper

l:

lower

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Authors and Affiliations

  1. Laboratoire d’Etudes Thermiques, Energétiques et Environnement, Centre de Recherche, BP 92116, 56 321, Lorient Cedex, France

    N. Allanic, P. Salagnac & P. Glouannec

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  1. N. Allanic
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  2. P. Salagnac
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  3. P. Glouannec
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Correspondence to P. Salagnac.

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Allanic, N., Salagnac, P. & Glouannec, P. Convective and radiant drying of a polymer aqueous solution. Heat Mass Transfer 43, 1087–1095 (2007). https://doi.org/10.1007/s00231-006-0196-5

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  • DOI: https://doi.org/10.1007/s00231-006-0196-5

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