About this Abstract |
Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
Presentation Title |
Rectifying Efficiency Measures for Vascular Based Thermal Regulation in Fiber-reinforced Polymer Composites |
Author(s) |
Sandeep R. Kumar, Kripa Adhikari, Kalyana B. Nakshatrala, Jason F. Patrick |
On-Site Speaker (Planned) |
Sandeep R. Kumar |
Abstract Scope |
Bioinspired active cooling via fluid flow within internal microchannels (i.e., vasculature) has proven to be an efficient thermal regulation technique applicable to diverse applications, spanning from electric vehicle battery packaging to spacecraft components [1,2]. Active thermal protection is essential for polymer-matrix composites, where temperatures exceeding the thermoset glass transition or thermoplastic melting point can compromise structural integrity [3]. To assess the effectiveness of active cooling, experimental and modeling studies use the ratio of heat extracted by the fluid to the heat supplied to the host material as a measure of efficiency. However, recent theoretical findings have shown that this established definition could violate the fundamental requirement in thermodynamics—that efficiency must lie between zero and unity [4]. Moreover, recent work has shown that this efficiency measure varies monotonically with fluid inlet temperature, indicating that larger deviations from ambient can exacerbate such violations [5].
Considering these theoretical predictions, we advance the research space and scientific understanding by physically proving that it is indeed possible to violate the upper and lower bounds of efficiency in actively cooled microvascular fiber-composites. Through carefully designed experiments, we recreate conditions under which these excursions can occur, calculate the thermal interactions among the solid, fluid and ambient, and explain the reason for the seemingly unreasonable efficiency values under such conditions. We also provide alternative efficiency definitions for active cooling and heating that are transferable across various platforms. This latest work advances fundamental understanding and facilitates the realization of unique vascular-based thermal regulation solutions in composites and beyond. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |