The Mechanical Engineering Handbook



Prandtl Number

Prandtl Number Equation



$$ Pr = \frac{\nu}{\alpha} $$ where:

Pr   =   Prandtl Numebr   (Dimensionless)

ν   =   Kinematic viscosity  (m²/s)

α   =   Thermal Diffusivity   (m²/s)


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Equation Assumptions



Assumptions:

  • The fluid is incompressible.
  • The fluid flow is laminar.
  • The fluid is homogeneous.
  • Flow is single phase.