Two-Phase R-134a Void Fraction Pulsed Power Study

Document Type

Article

Publication Date

2023

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Abstract

With the constant development of new technology and advanced electronics that are being incorporated into modern aircraft, efficient thermal management systems are becoming increasingly important for the removal of unwanted heat energy. When designing these thermal management systems, it is important to account for different instabilities that might arise, such as those caused by flow boiling. Thermal instabilities can severely damage electronics and hurt the overall reliability of the aircraft. In this experiment, the void fraction is used to study the dynamic flow instabilities. Electrical Capacitance Tomography (ECT) allows for the collection of capacitance data from the fluid moving through a tube. The mixture of vapor/liquid, and the transition between the two, will have different permittivity values depending on the fluid state. These permittivity values can be measured and recorded by the ECT sensor. Therefore, the void fraction behavior while the refrigerant is exposed to flow boiling instabilities, influenced by transient pulse power changes, can be observed. The results of this experiment will allow for the design of future thermal management systems which handle abrupt changes in the thermal load they are required to control more efficiently.

DOI

10.2514/6.2023-3914

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