For plain carbon steel, with properties at 300K in the Appendix and convection (h=50 W/m^2 K) to air at 500K, determine:
a. the diameter of largest solid sphere for lumped behavior (2 part- show equivalent length is D/6 and that D for Bi<0.1)
b. compare this to a slab of the same material under the same convection( 2 part - show the equivalent length is the slab thickness 2L and that L)