The crossflow heat exchanger model has more realistic results with the upstream properties of the inflow taken into account. All the applicable models in the Application Libraries have been updated to take advantage of this boundary condition. Overall, this leads to more accurate and realistic physical models. Additionally, it does not constrain the temperature at the inlet's adjacent edges (or points in 2D), but instead assigns a heat flux that is consistent with the upstream conditions.
Applied at inlets, where you would previously apply a Temperature boundary condition, the Inflow condition accounts for temperature and pressure from upstream phenomena. The new Inflow boundary condition applies an inflow of heat coming from a virtual domain, which has been excluded from the model to simplify the analysis, with known upstream conditions. Learn about these heat transfer features and more below. For users of the Heat Transfer Module, COMSOL Multiphysics ® version 5.3a brings a new Inflow boundary condition that can account for upstream temperature and pressure, a complete multiphysics coupling for modeling moisture transport in air, as well as a new interface for modeling radiative beams in absorbing media.
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