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Heat Transfer by Free Convection

Application ID: 122

This example describes an array of heating tubes submerged in a vessel with fluid flow entering at the bottom.

This is a multiphysics model because it involves fluid dynamics coupled with heat transfer. The pressure and the velocity field are the solution of the Navier-Stokes equations, while the temperature is solved through the heat equation.

In this model, the equations are coupled in both directions. The buoyancy force lifting the fluid is entered in the compressible Navier-Stokes equations via a force term depending on the temperature through the density. At the same time, the heat equation accounts for convective heat transfer.

The implementation uses two physics interfaces: the *Laminar Flow* interface for laminar single-phase fluid flow and the *Heat Transfer in Fluids* interface for heat transfer. In addition, the multiphysics features *Temperature Coupling* and *Flow Coupling* are used to set automatically the coupling between the two interfaces.

This model is included as an example in the following products:

COMSOL Multiphysics®

The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Grille de spécifications and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.