When 3:30 PM - 5:00 PM Jan 28, 2011
Where 1670 CSE
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Andrey Voevodin, Air Force Research Laboratory, Materials and Manufacturing Directorate


Overview of Thermal Sciences and Materials Branch Research (AFRL/RXBT)

Thermal Management (TM) is critical for today’s military systems across all services and is likely to remain so for the future. Air Force TM needs include extremely high thermal fluxes, aggressive operational temperatures, and large onboard generated waste heat — all orders of magnitude different from commercial systems. Air and space systems have a restricted ability for overboard heat rejection. New materials for thermal management can dramatically change possible design solutions for acquiring, transporting, storing, converting or rejecting thermal energy on the military platforms. Some design changing materials include tailored and adaptive thermal interfaces, high-temperature mechanical contacts, advanced coolants, directionally controlled thermal transport, thermal energy storage, rejection and harvesting, thermal load sensing and self-adaptive response. While tracking the system level impact of new material insertions is a challenging task, it is clear that the benefits and use of the new TM materials need to be considered at early design stages. This presentation provides a brief overview of related material technologies and associated modeling and simulation being explored in Thermal Sciences and Materials branch of Materials and Manufacturing Directorate in AFRL. The research areas include: - advanced coolants with extended temperature range and thermal capacity using single and two-phase operation, synthetic chemistry, and nanoparticle technology ;- tailored and adaptive thermal conductivity interfaces using inorganic metal-ceramic multilayer thin films, carbon-nanotube (CNT) arrays, polymer- CNT structures, and micro-encapsulated phase change materials (PCMs); - high and directional thermal conductivity materials using CNTs and carbon fiber composites; - thermal energy temporal storage and energy conversion materials using PCMs and thermoelectric layered and composite structures. The presentation informs about the progress in material research and identifies areas of potential collaboration with the thermal energy management research community.