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A larger Nusselt number corresponds to more active convection, with turbulent flow typically in the 100–1000 range. [2] A similar non-dimensional property is the Biot number, which concerns thermal conductivity for a solid body rather than a fluid. The mass transfer analogue of the Nusselt number is the Sherwood number.
Download as PDF; Printable version; In other projects ... Nusselt number: Nu ... is the corresponding free field wavenumber and is the ...
Download as PDF; Printable version; In other projects ... Pages in category "Dimensionless numbers of fluid mechanics" ... Nusselt number; O. Ohnesorge number; P.
Download as PDF; Printable version; In other projects ... Pages in category "Dimensionless numbers of thermodynamics" ... Nusselt number; P. Particle number;
The heat transfer coefficient is often calculated from the Nusselt number (a dimensionless number). There are also online calculators available specifically for Heat-transfer fluid applications. Experimental assessment of the heat transfer coefficient poses some challenges especially when small fluxes are to be measured (e.g. < 0.2 W/cm 2). [1] [2]
The film temperature is often used as the temperature at which fluid properties are calculated when using the Prandtl number, Nusselt number, Reynolds number or Grashof number to calculate a heat transfer coefficient, because it is a reasonable first approximation to the temperature within the convection boundary layer.
In convective heat transfer, the Churchill–Bernstein equation is used to estimate the surface averaged Nusselt number for a cylinder in cross flow at various velocities. [1] The need for the equation arises from the inability to solve the Navier–Stokes equations in the turbulent flow regime, even for a Newtonian fluid .
The relative magnitudes of the Grashof number and the square of the Reynolds number determine which form of convection dominates. If G r / R e 2 ≫ 1 {\displaystyle {\rm {Gr/Re^{2}\gg 1}}} , forced convection may be neglected, whereas if G r / R e 2 ≪ 1 {\displaystyle {\rm {Gr/Re^{2}\ll 1}}} , natural convection may be neglected.
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