Phase Change Materials

Phase change material thermophysical property tableModeling the Latent Heat of Fusion

Tracking the energy of a phase change can be difficult if your software isn't designed to handle it. One trick of yesteryear was to create a spike in the thermal capacitance versus temperature table, but this is not particularly accurate and can cause problems with convergence. Thermal DesktopĀ® provides a user friendly interface for defining the thermophysical properties of a phase changing materials, and SINDA/FLUINT accurately models this energy. This interface allows for a liquid/solid phase change as well as an additional solid/solid. 

This can be applied to something as simple as melting ice, but specific phase-change materials (PCMs) are designed to be used across many industries such as solar thermal storage, solar power plants, medical devices, electronics, spacecraft, and food storage. The intent is to absorb or release significant amounts of energy while maintaining a constant temperature. 

A sample model was created to show how to set up a phase change material. A transmitter is mounted to a convectively cooled aluminum plate. The transmitter is in a low power mode most of the time, but at fixed intervals it goes into a high power mode to transmit. A PCM was applied to the aluminum plate to dampen the thermal response of the transmitter. 

Comparing transmitter temperatures with and without PCM

This example is available on our User Forum

Reacting Flows

Tuesday May 5th, 2pm MT (1pm PT, 4pm ET)

Reacting Flows is a capability that allows FloCAD to simulate fuel reformers, deal with the electrochemistry of flow batteries, predict combustion reactions in gas generations, and work with ionized and dissociated gases.

This webinar will explain how to use a working fluid as a reactant. It will also detail various options for determining reaction rates such as equilibrium, finite rate with stoichiometric coefficients, and percent complete based on inflowing reagents. Example applications are summarized.

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Dissolved Gases

Thursday May 7th, 2pm MT (1pm PT, 4pm ET)

When vapor meets liquid, it can condense. When gas (NCG) meets liquid, it can dissolve. When there is too much gas in the liquid, it can either evolve slowly at a wall or at the surface ... or it can come out explosively.

Whether your interests are environmental control, liquid propulsion, fire retardant delivery, or beer, this webinar offers a rare glimpse into an advanced modeling topic.

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