Articles Posted in the " Dimensionless Numbers " Category

  • Heat transfer: Dimensionless numbers

    Heat transfer: Dimensionless numbers

    Heat transfer: Dimensionless numbers PHYSICAL SIGNIFICANCE OF PRANDTL NUMBER Prandtl number (Pr) is a dimensionless number. Pr = momentum diffusivity/Thermal diffusivity =μ Cp/kf Value of Prandtl number signifies the thickness of thermal boundary layer as compared to the thickness of hydro boundary layer. If Pr =1, δ =δth If Pr <1 then δ < δth If Pr […]


  • * Dimensionless Numbers

    * Dimensionless Numbers

    DIMENSIONLESS NUMBERS It is a convention to express governing equations in convection in terms of non-dimensionless numbers to reduce the number of variables. This makes the equations convenient and easy to handle.  NUSSELT NUMBER Nusselt number describes the mechanism of convection. It represents increase in HT in a moving fluid by convection as compared to […]