Transport Processes and Separation Process Principles (Includes Unit Operations) Fourth Edition

9.6. CALCULATION METHODS FOR CONSTANT-RATE DRYING PERIOD

9.6A. Method Using Experimental Drying Curve

1. Introduction

Probably the most important factor in drying calculations is the length of time required to dry a material from a given initial free moisture content X₁ to a final moisture content X₂. For drying in the constant-rate period, we can estimate the time needed by using experimental batch-drying curves or by using predicted mass- and heat-transfer coefficients.

2. Method using drying curve

To estimate the time of drying for a given batch of material, the best method is based on actual experimental data obtained under conditions where the feed material, relative exposed surface area, gas velocity, temperature, and humidity are essentially ...