Page 346 - Finite Element Modeling and Simulations with ANSYS Workbench

Thermal Analysis 331

All dimensions are in millimeters.

40.000 4.000

100.000

4.000

26.000
30.000

9.3 Determine the temperature and heat flux distributions inside the following heat
transfer pipe with internal ribs. A bulk temperature of 80°C and 20°C with a film
coefficient of 100 W/(m °C) and 30 W/(m °C) is specified for the interior and exte-
2
2
rior convective heat transfer, respectively. Assume that the pipe is 30 cm long with
a thermal conductivity of 230 W/(m K) and that the two ends of the pipe are per-
fectly insulated.

All dimensions are in centimeters.
0.450
R5.500
R5.000

0.450 0.450
2.500
2.500
2.500
2.500

0.450

9.4 A 10 cm thick perforated concrete slab is shown below. The concrete has a
thermal conductivity k = 1.0 W/(m K), Young’s modulus E = 29 GPa, Poisson’s
−6
ratio ν = 0.15, and thermal expansion coefficient α = 11 × 10 /°C. The bulk tem-
perature of the fluid inside the circular perforated holes is 60°C with a film