1. What is Constant Rate Drying Time?

Definition: This calculator determines the constant rate drying time based on total drying time and falling rate drying time.

Purpose: It helps in drying process analysis and optimization by separating the constant rate period from the total drying time.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( t_c \) — Constant rate drying time (seconds)
• \( t \) — Total drying time (seconds)
• \( t_f \) — Falling rate drying time (seconds)

Explanation: The falling rate drying time is subtracted from the total drying time to isolate the constant rate period.

3. Importance of Drying Time Calculation

Details: Understanding drying phases helps optimize drying processes, reduce energy consumption, and improve product quality.

4. Using the Calculator

Tips: Enter the total drying time and falling rate drying time (both in seconds). The falling rate time must be ≤ total time.

5. Frequently Asked Questions (FAQ)

Q1: What is constant rate drying period?
A: The initial drying phase where moisture removal rate is constant as surface moisture evaporates.

Q2: What is falling rate drying period?
A: The later phase where drying rate decreases as internal moisture must diffuse to the surface.

Q3: How do I measure total drying time?
A: Total drying time is typically measured experimentally from start to when product reaches desired moisture content.

Q4: Can falling rate time exceed total time?
A: No, falling rate time must be less than or equal to total drying time.

Q5: What affects constant rate drying time?
A: Air temperature, humidity, velocity, and material surface area affect constant rate duration.