Constant Rate Drying Time Formula:
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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.
The calculator uses the formula:
Where:
Explanation: The falling rate drying time is subtracted from the total drying time to isolate the constant rate period.
Details: Understanding drying phases helps optimize drying processes, reduce energy consumption, and improve product quality.
Tips: Enter the total drying time and falling rate drying time (both in seconds). The falling rate time must be ≤ total time.
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.