Drying-rate Equations of Shrinking Root Vegetables

Abstract

In the previous paper, we have studied on the over-all drying-rate equations. In this paper, we studied on the drying-shrinkage and rate equations of root vegetables. The empirical dryingrate equations were postulated as follows. dx/dθ=knS(1-x)ⁿ S=S₀(-ax+1)^2/3, x=(w₀-w)/(w₀-w_e) For drying-shell model: α=1-w_eρ₀/(w₀ρ₀) For uniform drying model: a=1-{(w_e/ρ_e)/[(w₀-w_e)/ρH+w_e/ρ_e]} where, x: drying ratio (-), θ: drying time (min), S, w and ρ: surface area (cmcm²), weight (g) and density (g/cm³). Subscripts H, O and e: water, initial and equilibrium states. These calculated results agreed with the observed values.