Total Heat Flux

This user dialog assists calculation of heat fluxes at region boundaries. It can be useful for analysis of the heat flow in complex environment. The computed heat fluxes are the conductive fluxes at the selected region boundary from the side of the selected region.

  1. In order to use this dialog first, the distribution of the heat fluxes should be computed everywhere. For computation of the heat fluxes select the current variables group Temperature in the list of variables of the main CrysMAS window. As a variable select either RadialHeatFlux or AxialHeatFlux in the variables list on the right. Then deselect all regions (click outside with the left mouse button) and press the button Start Computation. The heat fluxes will be computed and stored everywhere. Note that the temperature should be already calculated.

  2. After heat fluxes were computed, open the dialog window Heat Fluxes.

    Computation of the heat fluxes at the selected boundaries 

    Figure 17. Computation of the heat fluxes at the selected boundaries

  3. Select lines at which heat fluxes should be indicated with the middle mouse button. Number of selected lines will be indicated on top of the Heat Fluxes dialog window.

  4. Additionally select for each selected line the region where the heat flux should be computed. The line is the boundary segment of the selected region. For the lines at the external boundary of the computational domain only one region can be selected. For lines inside of the computational domain either line on the left or on the right side from the line should be selected. If both left and right regions are selected, this will prevent the computation of the heat flux on the line. If the selection is finished, check that each selected line has the selected region either on the left or on the right side from it.

  5. The coordinates of the selected lines will be indicated in the list of the Heat Fluxes dialog. Press Apply button of it. The heat flux at each selected line will be integrated along the line and the result will be indicated in the line list. The summary of the heat fluxes will be indicated at the bottom as total flux = ... Watt .

  6. If pressing Apply didn't cause the flux integration, then check the regions selection. An adjoint region of some selected line could be not selected.

Note

The computation of the conductive heat fluxes at the line is implemented on the structured and unstructured mesh, for the isotropic and orthotropic heat conductivity.

Tip

Conductive heat fluxes on the left and on the right side of the selected line should be equal, if only heat conduction is considered in both regions adjoint to the line. If radiation is considered in any of the neighboring regions, then the difference of the conductive heat fluxes should be equal to the net radiation flux on the selected line. The Heat Fluxes dialog can then be used for evaluation of the net radiative flux.

Another case when the conductive fluxes are not equal is for the solidification boundary in the hybrid method application. Then the difference of the heat fluxes should be equal to the latent heat power density according to the prescribed specific latent heat and the crystal growth velocity parameters.

Additionally the net radiative flux could be included into the energy balance at the solidification boundary if either crystal or melt materials are at least partly transparent.