Compare two identical steel spheres, except the first has a two inch diameter while the second sphere has a four inch diameter. The larger sphere will have a Fourier number approximately:
a) half that of the smaller sphere
b) four times larger than that of the smaller sphere
c) twenty-five percent of the value of that of the smaller sphere
d) the Fourier numbers will be identical© BrainMass Inc. brainmass.com October 24, 2018, 11:07 pm ad1c9bdddf
The Fourier nNumber of the objects keeping all other parameters same is inversely dependent on the square of the length of the heat ...
This solution determines the Fourier number with a sphere of diameter 2cm and justifies the answer. Two identical steel spheres are analyzed.
Transient convection problem that utilizes dimensionless numbers
A 10 cm thick pure gold plate is initially at 85˚C. Both top and bottom boundary surfaces are exposed to an ambient gas at 15˚C with a heat transfer coefficient of h=400 W/C-m^s Calculate the center temperature at t = 6 minutes after the start of cooling.View Full Posting Details