FEM ConstraintHeatflux/it
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| Posizione nel menu |
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| Modello → Vincoli termici → Vincolo scambio termico |
| Ambiente |
| FEM |
| Avvio veloce |
| Nessuno |
| Introdotto nella versione |
| - |
| Vedere anche |
| Tutorial FEM |
Descrizione
Questo vincolo specifica lo scambio termico (film heat transfer) di una superficie a temperatura T e con un coefficiente di scambio termico h e una temperatura ambiente T0 . Il flusso di calore convettivo q è in grado di soddisfare: q = h(T -T0)
Heat sink with convective heat flux load on the surfaces exposed to air
Utilizzo
- Cliccare su
o scgliere Modello → Vincoli termici → Vincolo Scambio termico dal menu principale. - Selezionare nella vista 3D la superficie a cui il vincolo deve essere applicato.
- Inserire la temperatura della superficie desiderata, il coefficiente del materiale e la temperatura ambiente.
Properties
- DatiAmbient Temp: Ambient temperature (for Convection and Radiation modes).
- DatiFilm Coef: Film coefficient (for Convection mode).
- DatiEmissivity: Emissivity (for Radiation mode).
- DatiDFlux: Distributed heat flux (for DFlux mode).
- DatiConstraint Type: Type of heat flux load: DFlux, Convection or Radiation.
- DatiCavity Radiation - introduced in 1.1: Enable cavity (surface-to-surface) radiation (for Radiation mode).
- DatiCavity Name - introduced in 1.1: Name of the cavity definition to which the heat flux constraint belongs (for Radiation mode).
- DatiEnable Amplitude - introduced in 1.1: Enables the use of CalculiX's amplitude for time variation of the heat flux load. At a given time, magnitude of the load is multiplied by the amplitude value corresponding to that time. Linear interpolation is used between the specified values. Constant values are used outside of the specified range.
- DatiAmplitude Values - introduced in 1.1: Amplitude table in the following format:
time_1, amplitude_value_1 ...
- Default is linear increase from 0% at t=0 to 100% at t=1:
0, 0 1, 1
Note
- Il vincolo utilizza la *FILM card in CalculiX. Il vincolo scambio termico è spiegato in http://web.mit.edu/calculix_v2.7/CalculiX/ccx_2.7/doc/ccx/node203.html
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