What worries me is that without understanding why the inlet heat flux is so much different than expected I can not be sure that the heat fluxes Net Results represent the real energy balance of the system. The more converged my calculations are, the lower Net Result (for all BCs) of Total Heat Transfer Rate is. The inlet heat flux hardly changed after this. It can be a line in any direction, a plane normal to any of the axis or a 3D monitor. MONITOR TYPE: The monitor geometry can be chosen. The data has the unit of W/m in 2D and W in 3D. I checked the results for much lower as well as 0 turbulence kinetic energy and dissipation rate. Power flow monitor records the heat flux through a line, area or volume of the simulation region. The second link you recommended gave me an idea that maybe turbulence properties are too high for the inlet and that some of the turbulent energy is hidden in this Flux Report. There the outcome for outlet is similar to the expected one, however inlet is much different. Unfortunately I still do not understand how it works for Total Heat Transfer Rate in Flux Reports. The requirements needed are the face of the body which the kinetic heat flux will be applied to as well as the path of the gaussian heat source. Calculating one can integrate the heat flux along the. applied at each end (200C one end and 93C at other). In the example a copper rod has a constant temp. Using this plugin, you can quickly model a moving heat source by simply entering the required inputs. I want to find a way to compute the net (total) heat flow rather than the discrete steps of heat flow that match a mesh. Applying the Moving Heat Source Extension. Specific enthalpy is calculated based on the temperature as well as the reference temperature.įor additional information, look at 'The Energy Equation' in the Fluent Theory guide (Section 5.2.1.1) using the following link: Īfter using the method you described with Surface Integrals and Flow Rate for inlet and outlet, the values are the same as calculated by hand and everything is as predicted. Ansys versions 17.0, 17.1, and 17.2 are supported. Reporting Heat Transfer Through a Surface). We observed that heat flux is increased at each. Figure 23 clearly shows that the heat flux is clearly applied on the bottom of the microchannels in the electronic chip. On the bottom edge I am applying a constant heat flux (505253 W/m2), on the same edge I am applying an emissivity of 0.47. The heat flux acts at the underside surface of the microchannel heat sink to compute the heat generation in the microelectronic chip. The total Q reported by Fluent crossing the inlet and outlet is the surface integral ofįor additional details, please have a look at the following link (Fluent Users Guide: Section 14.2.3.4. Good people of ANSYS Learning Forum,nI have a 2D axisymmetric model i.e. I would recommend using the same heat flux value, but changing the depth in the reference values section accordingly so that the total heat input remains the same. To estimate the total heat transfer rate at the inlet and outlet, please go to 'Surface Integrals', choose 'Flow Rate' for the 'Report Type', select 'Enthalpy' (in the Temperature category), and select your inlet and outlet surfaces over which you would like to integrate.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |