AME 331, Spring 2008
Problem set #6
Assigned: April 4, 2008
Due: April 11, 2008, 4:30 pm in OHE 430J
Concept 
Problem (Holman) 
Points 
Answer 
Natural convection boundary layers 
77 
10 

Vertical cylinder 
714 
15 

Vertical plate, constant temperature 
718 
15 
1900 W 
Vertical plate, constant heat flux 
721 
15 
Avg. h = 264 W/m^{2}; Avg. T_{w} = 18.8ūC 
Horizontal cylinder 
734 
15 

Vertical enclosure 
780 
15 
2060 W 
Horizontal enclosure 
781 
15 
2550 W 
Note on problem 77: use Eq. 720 which is only valid for laminar flow to compute boundary layer thickness, even though Gr is somewhat larger than the limit for laminar flow.