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Molecular diffusivity of momentum is the spread of momentum between particles (atoms or molecules) of matter, often in the fluid state. It represents how quickly momentum is transferred through a fluid due to molecular motion.
The calculator uses the formula:
Where:
Explanation: The Prandtl Number represents the ratio of momentum diffusivity to thermal diffusivity, allowing calculation of momentum diffusivity when thermal diffusivity is known.
Details: Accurate calculation of molecular diffusivity of momentum is crucial for understanding fluid dynamics, heat transfer processes, and designing efficient thermal systems in various engineering applications.
Tips: Enter Prandtl Number (dimensionless) and Molecular Diffusivity of Heat in m²/s. Both values must be positive numbers.
Q1: What is the physical significance of Prandtl Number?
A: Prandtl Number represents the ratio of momentum diffusivity to thermal diffusivity, indicating the relative ease of momentum transport compared to heat transport in a fluid.
Q2: What are typical values for Molecular Diffusivity of Momentum?
A: Values vary significantly depending on the fluid. For water at 20°C, it's approximately 1×10⁻⁶ m²/s, while for air it's about 1.5×10⁻⁵ m²/s.
Q3: How does temperature affect Molecular Diffusivity?
A: Molecular diffusivity generally increases with temperature as molecular motion becomes more vigorous, enhancing the transfer of momentum and heat.
Q4: What's the difference between molecular and turbulent diffusivity?
A: Molecular diffusivity occurs at the microscopic level due to random molecular motion, while turbulent diffusivity occurs at macroscopic scales due to fluid eddies and turbulence.
Q5: In which engineering applications is this calculation important?
A: This calculation is vital in heat exchanger design, chemical processing, aerodynamics, and any application involving fluid flow and heat transfer.