Unformatted text preview: = 25°F Analysis Assumptions and Modeling Notes
Since the problem is axisymmetric, only a one-element sector is needed. A small angle Θ = 15° is used for approximating the circular boundary with a straight-side element. Nodal coupling is used to ensure circumferential
symmetry. Automatic time stepping is used. The initial integration time step (6/40 = 0.15 hr) is based on ≈ δ2/4 α,
where δ is the element characteristic length (0.0555 ft) and α is the thermal diffusivity (k/γc = 0.005 ft2/hr). POST1
is used to extract results from the solution phase. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–249 VM111 Results Comparison
Time = 6 hr Target ANSYS Ratio T, °F 28.0 28.66 1.024 1. 1–250 Based on graphical estimates. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. VM112: Cooling of a Spherical Body
Reference: F. Kreith, Principles of Heat Transfer, 2nd Printing, International Textbook Co.,
Scranton, PA, 1959, pg. 143, ex. 4-5. Analy...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.
- Spring '09
- The Land