24-322 Heat Transfer, Fall 2014 HW#3
Assigned: Sept 11, 2014
Due: September 18, 2014 (at the beginning of class)
A. In this problem you will derive the temperature distribution in a cylindrical solid with
outer radius ro and heat generation q . The gove
KNOWN: Spherical tank of 3-m diameter containing LP gas at -60C with 250 mm thickness of
insulation having thermal conductivity of 0.06 W/mK. Ambient air temperature and convection
coefficient on the outer surface are 20C and 6 W/m K, respe
KNOWN: Thickness, length, thermal conductivity, and base temperature of a rectangular fin. Fluid
temperature and convection coefficient.
FIND: (a) Heat rate per unit width, efficiency, effectiveness, thermal resistance, and tip temperature
KNOWN: Dimensions and end temperatures of pin fins.
FIND: (a) Heat transfer by convection from a single fin and (b) Total heat transfer from a 1
m surface with fins mounted on 4mm centers.
ASSUMPTIONS: (1) Steady-state, (2) One-