engineering recuitment HAL Management & Design Trainee Mock Test 2023 Heat Transfer Convection Dimensionless Numbers
The Grashof number, Gr is defined as:(where g is gravitational acceleration, β is volumetric thermal expansion coefficient, ΔT is temperature difference, L is characteristic length, μ is the viscosity and v is kinematic viscosity.
1
\(\frac{{g\beta {\rm{\Delta }}T{L^3}}}{{{\mu ^2}}}\)
2
\(\frac{{{\rho ^2}g\beta \delta T{L^3}}}{{{\mu ^2}}}\)
3
\(\frac{{g\beta {\rm{\Delta }}T{L^3}}}{{{v^2}}}\)
4
\(\frac{{g\beta \delta TL}}{{{v^2}}}\)