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Design and Analysis of a Micro-Combustion Device in LTCC
Keywords: Micro combustion, Thermal network modeling, Thermal imaging
The need for a portable power system that can meet the demands of high performance electronics without the limitations imposed by traditional battery technologies has been the cornerstone of various research endeavors. These micro power systems typically use the heat released through the combustion of gaseous fuels to provide heat for a thermoelectric device or as a direct heat source for fuel cells. The combustion of gaseous fuels requires a device with a lower bound on the channel feature size. This lower limit for combustion corresponds to the minimum quenching distance of the specific fuel being used and usually corresponds to the upper end of silicon MEMs processing techniques and the lower end of meso-scale production processes. This millimeter size range represents the normal feature size range for the LTCC tape system. A potential material imposed restriction to using LTCC is the relatively low temperature operating range when compared to the adiabatic flame temperatures encountered in the combustion of gaseous fuels. To address this concern an analytic model of the heat transfer from a simple straight channel device will be presented. This model will allow for the analysis of the thermal loads in the substrate as well as provide insight into the effects of the channel geometry on the flame stability. Several experimental devices will be designed and tested in accordance with the predictions of the analytic model. These devices will have similar geometric configurations with different characteristic lengths. This will allow for the validation of the flame stability margins and heat transfer properties predicted by the analytic model. The experimental investigation will focus on indirect surface temperature mapping through infrared imaging.
Matthew H. McCrink, Research Assistant
Boise State University
Meridian, ID

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