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

9.5. RATE-OF-DRYING CURVES

9.5A. Introduction and Experimental Methods

1. Introduction

In the drying of various types of process materials from one moisture content to another, it is usually desired to estimate the size of dryer needed, the various operating conditions of humidity and temperature for the air used, and the time needed to perform the amount of drying required. As discussed in Section 9.4, equilibrium moisture contents of various materials cannot be predicted and must be determined experimentally. Similarly, since our knowledge of the basic mechanisms of rates of drying is quite incomplete, it is necessary in most cases to obtain some experimental measurements of drying rates.

2. Experimental determination of rate of drying

To experimentally ...