Grashoff number has a significant role in heat transfer by

Explanation:-

\(\rm Grashoff\;number = \frac{{{\rm{Buoyancy\;Force}}}}{{{\rm{Viscus\;Force}}}}\)

\(Gr = {\rm{\;}}\frac{{{\rm{g\beta \Delta T}}{{\rm{L}}^3}}}{{{{\rm{\nu }}^2}}}\)

g = acceleration due to gravity, β = isobaric volume expansion coefficient of fluid, ΔT = temperature difference, L = characteristic dimension of body,ν = kinematic viscosity

Some important points regarding Grashoff number

• The role played by the Reynolds number in forced convection is played by the Grashoff number in natural convection.
• The flow in Free convection Heat Transfer is decided as laminar or turbulent based on the value of (Gr Pr) product that is Rayleigh number (Ra)

Additional Information

Other important dimensionless numbers are:

• Biot number  → Ratio of internal conductive resistance to external convective resistance.
• Grashoff number  → Ratio of buoyancy to viscous force
• Prandtl number  → Ratio of momentum diffusivity to thermal diffusivities
• Reynolds number  → Ratio of inertia force to viscous force.