Page 169 - Using ANSYS for Finite Element Analysis Dynamic, Probabilistic, Design and Heat Transfer Analysis

156 • using ansys for finite eLement anaLysis

Geometric properties Value Distribution
Diameter 25 mm Uniform
Length 1320 mm Uniform

Material properties Nominal value Distribution
At Average Temperature
Thermal Conductivity 398 W/m.k T = (T + T )/2
Coefficient b ∞
= 62.5C°~355k
Convection Heat 10 W/m .k
2
Transfer Coefficient

Loading Nominal Value Location
Temperature Thermal 100°C At the base of the fin.
Load
At the cylindrical edge
Convection Thermal 10 W/m .k and the flat face at the
2
Load
tip of the fin.
1. Establish the Command Log File
First, solve the problem interactively and then save the database
log file.
• Set preference for thermal analysis:
Preference > Thermal > OK
• Use the thermal solid element Quad4node55 for FEM modeling:
Preprocessor -> Element Type -> Add/Edit/Delete ->
Add-> Thermal Mass-Solid -> Select 4node 55 -> OK ->
Options -> Element Behavior:
Select Axisymmetric -> OK -> Close
• Enter material property data for specified steel:
Preprocessor -> Material Props -> Material Model ->
Thermal > Conductivity > Isotropic > Enter conductivity
value KXX = 398 > OK -> Close
• Create geometry for one rectangles 12.5E-3 m by 1.32 m at
locations (0,0):
Preprocessor -> Modeling -> Create -> Areas-Rectangle
-> By 2 Corners -> In dialogue box enter WP X = 0, WP
Y = 0, Width = 12.5E-3, Height = 1.3 -> OK
• Now, to create a mesh, first refining the mesh size by speci-
fying the number of elements along the length (line numbers
2 and 4) = 600 and along radius (line numbers 1 and 3) = 5: