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

flow regimes

Introduction to Two-phase Flow

September 24, 2-3pm MDT

This webinar introduces basic concepts in two-phase flow modeling including quality, void fraction, flow regimes, slip flow, pressure drops and accelerations, and heat transfer.

No knowledge of CRTech software is required. However, references to the corresponding FloCAD features will be made to assist users of that product.

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Introductory FloCAD Training

Class times: September 5, 10, and 12, 2019, 9:00 am to 12:00 pm MDT daily
Cost: no charge (attendees must have an active support contract)

CRTech will be hosting introductory training for FloCAD (Flow Modeling in Thermal Desktop). This is our standard FloCAD class previously hosted in a classroom environment and now restructured for an online teaching environment.

The class will introduce single-phase fluid modeling concepts and how to build fluid models within the FloCAD work environment. Topics covered include an introduction to fluid modeling components, geometric versus non-geometric modeling options, working with FloCAD Pipes, solution control, and an introduction to path and pipe libraries.

The class will be broken into three two- to three-hour sessions held over a 3 day period. The format will be online lecture and demonstration with opportunities to ask questions. Hands-on lab work will be provided to students to work on after each session. To gain the most from this class, students are encouraged to attend all three sessions.

Prerequisites: Attendees must have basic working knowledge of Thermal Desktop as many of its base features will not be covered in this class but their usage is required for FloCAD.

Eligibility Requirement: This class is a service to our customers. All attendees must have an active support contract. If you are unsure of your support status, please contact CRTech.

Click here to register