Home
Back
Evaporation Rate Equation:
| From: | To: |
The evaporation rate equation calculates the mass transfer rate of a liquid evaporating into air. It's commonly used in chemical engineering, environmental science, and industrial processes to estimate how quickly a liquid will evaporate under given conditions.
The calculator uses the evaporation rate equation:
Where:
Explanation: The equation calculates the evaporation rate based on the driving force (humidity difference) and the mass transfer characteristics of the system.
Details: Accurate evaporation rate estimation is crucial for designing industrial processes, environmental impact assessments, water resource management, and climate modeling.
Tips: Enter all parameters in consistent units. Ensure saturation humidity is greater than air humidity for evaporation to occur. All values must be positive numbers.
Q1: What affects the mass transfer coefficient (K)?
A: K depends on temperature, air velocity, liquid properties, and surface characteristics. It's often determined experimentally.
Q2: How do I find saturation humidity?
A: Saturation humidity can be calculated from temperature using psychrometric relationships or found in steam tables.
Q3: What's a typical evaporation rate for water?
A: For water at room temperature with mild air flow, typical rates range from 0.0001 to 0.01 kg/s per m².
Q4: Does this equation work for all liquids?
A: The form is similar for other liquids, but the mass transfer coefficient and humidity terms would need adjustment for the specific liquid.
Q5: How accurate is this calculation?
A: It provides a reasonable estimate but actual rates may vary due to factors like surface turbulence, temperature gradients, and impurities.