Modelagem de secadores industriais

3
CONTENTS
3.1 3.2 3.3 3.4

Basic Process Calculations and Simulations in Drying
Zdzisław Pakowski and Arun S. Mujumdar

Introduction ............................................................................................................................................. 54 Objectives ................................................................................................................................................. 54 Basic Classes of Models and Generic Dryer Types.................................................................................. 54 General Rules for a Dryer Model Formulation....................................................................................... 55 3.4.1 Mass and Energy Balances ........................................................................................................... 56 3.4.1.1 Mass Balances ................................................................................................................ 56 3.4.1.2 Energy balances.............................................................................................................. 56 3.4.2 Constitutive Equations ................................................................................................................. 57 3.4.2.1 Characteristic Drying Curve........................................................................................... 58 3.4.2.2 Kinetic Equation (e.g., Thin-Layer Equations) .............................................................. 58 3.4.3 Auxiliary Relationships ................................................................................................................ 59 3.4.3.1 Humid Gas Properties and Psychrometric Calculations ................................................ 59 3.4.3.2 Relations between Absolute Humidity, Relative Humidity, Temperature, and Enthalpy of Humid Gas ................................................................... 60 3.4.3.3 Calculations Involving Dew-Point