ME 323 Sample Problem 4A
Steady state conduction through layered slabs. What is the temperature distribution
through two layers with differing thermal conductivity k?
Since the heat flux through each of two layers A and B must be the same, then b
ME323 Sample 3
T = 30 C
A square power transistor chip (plan view)
is run continuously, dissipating 5 W. The
h = 400 W/m2 K
junctions are imbedded in plastic with
thermal conductivity k = 15 W/m K.
Cooling air at 30 C is blown across the top
Example 4. A tube and shell heat exchanger (two tube passes) is used to preheat clean
process water with wastewater discharge. Clean water flows at 17.5 GPM and is heated
from 70 F to 145 F; wastewater is cooled from 210 F to 154 F during the operation.
1. The dimensionless parameter that characterizes natural convection is the
2. Natural convection occurs in heat transfer because
ME 323 Heat Transfer Name: 0 V i 7"?
Exam 2, June 9, 2014
Open book, open notes
A pipe carrying heated oil is suspended so that wind can blow across it, which cools the oil. The
question is: How much is the oil cooled in a strong, cool wind? Use the f