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Natural Convection Cooling of a Vacuum Flask

Application ID: 1448


The following example solves a pure conduction and a free-convection problem in which a vacuum flask holding hot coffee dissipates thermal energy. The main interest is to calculate the flasks cooling power; that is, how much heat it loses per unit time. This example treats the natural convection cooling using two approaches:
• Using heat transfer coefficients to describe the thermal dissipation
• Modeling the buoyancy driven flow of air outside the flask to describe the convective cooling.

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

Heat Transfer Module

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 Specification Chart 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.