![]() When the Fluid option is set to From material, you can choose any material available in the Materials node. When the Fluid option is set to Moist air, the external relative humidity has to be specified for an accurate definition of the correlation. With the release of COMSOL Multiphysics ® version 5.3a, two new options are introduced for the external fluid when the heat transfer coefficient is defined by a correlation: Moist air and From material. The choice of the fluid material was previously restricted to air, water, or transformer oil. The heat transfer coefficients available in the coefficient libraries are defined for a number of configurations and are used to simulate heating or cooling due to an external fluid flow that is not part of the model. Heat Transfer Coefficients Library for Arbitrary Fluids The new Equivalent thin resistive layer option in the Thermal Contact node. With the user-defined options, you also have the capabilities to specify enthalpy change, account for the generation or loss of heat in the energy balance, and define different thermal properties for the transformed state. This new option is particularly useful when none of the predefined transformation models fit with your model, and/or when the fraction of transformation is obtained by a separate user-defined physics or mathematics interface. The previously named Energy absorption transformation model has been renamed Arrhenius kinetics and allows you to set more configurations for the rate of reaction with an option to specify the polynomial for the Arrhenius kinetics equation of any order n.Īdditionally, the attribute feature has a new User defined option for the transformation model, where you can set the Fraction of transformation. Applications include phenomenological modeling of solid combustion and melting. The Irreversible Transformation attribute feature, available for solid heat transfer under the Solid domain node, now has extended capabilities to model thermally induced irreversible transformations. View screenshot Irreversible Transformation in Solids When adding each multiphysics coupling, the software will automatically couple the appropriate single physics interfaces together. Finally, add the Nonisothermal Flow and Moisture Flow multiphysics couplings. Next, add a laminar or turbulent single-phase flow interface. To implement the full multiphysics coupling, first add the Moist Air version of the Heat and Moisture Transport coupling. ![]() When combined with the Nonisothermal Flow and the Heat and Moisture multiphysics couplings, you have a complete and comprehensive set of features for heat and moisture modeling in building material and moist air. One benefit of the Moisture Flow coupling, found in the Chemical Species Transport branch, is that it handles turbulent mixing and moisture wall functions for turbulent flows. It couples the laminar and turbulent versions of the Single-Phase Flow interfaces with the Moisture Transport in Air interface. COMSOL Multiphysics ® version 5.3a brings a complete suite of multiphysics couplings for modeling heat transfer, moisture transport, and fluid flow, enabling quick and easy modeling of real-world heat and moisture transport.Įxpanding upon moisture modeling functionality included in previous releases, the new Moisture Flow multiphysics coupling node is now available to model moisture transport in air by laminar and turbulent flows. Managing moisture transport is important in a large number of applications, including electronics packaging and building physics. ![]() 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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