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Molecular Diffusivity of Heat represents the spread of momentum between heat of matter, often in the fluid state. It is a crucial parameter in heat transfer and fluid dynamics calculations.
The calculator uses the formula:
Where:
Explanation: This formula calculates the molecular diffusivity of heat by dividing the molecular diffusivity of momentum by the Prandtl number.
Details: Accurate calculation of molecular diffusivity of heat is essential for analyzing heat transfer processes, designing thermal systems, and understanding fluid behavior in various engineering applications.
Tips: Enter molecular diffusivity of momentum in m²/s and Prandtl number as a dimensionless value. Both values must be positive numbers greater than zero.
Q1: What is the physical significance of Molecular Diffusivity of Heat?
A: It represents how quickly heat spreads through a material relative to momentum diffusion, indicating the material's thermal transport capabilities.
Q2: How does Prandtl Number affect Molecular Diffusivity of Heat?
A: Higher Prandtl numbers result in lower molecular diffusivity of heat for a given momentum diffusivity, indicating slower thermal diffusion relative to momentum diffusion.
Q3: What are typical values for Molecular Diffusivity of Heat?
A: Values vary significantly depending on the material. For air at room temperature, it's approximately 2.1 × 10⁻⁵ m²/s, while for water it's about 1.4 × 10⁻⁷ m²/s.
Q4: What are the limitations of this calculation?
A: This formula assumes constant properties and may not account for temperature dependence, pressure effects, or non-ideal behavior in complex fluids.
Q5: How is this parameter used in practical applications?
A: It's used in heat exchanger design, atmospheric science, chemical processing, and any application involving heat transfer through fluids.