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|A Low Temperature Co-fired Ceramic Burner for Studying Micro Flames|
|Keywords: LTCC, microcombustor, combustion diagnostics|
|A meso-scale opposed flame burner fabricated using low temperature co-fired ceramic (LTCC) technology is presented. Although LTCC tapes have been intensively studied for building microfluidic devices, relatively few studies have been developed to explore the possibility of applying LTCC to high temperature reactors. In this paper, non-premixed methane/oxygen combustion with adiabatic flame temperatures exceeding 3000 K is studied in a LTCC burner. With an opposed flow configuration, the temperature of the LTCC body is kept below the co-firing temperature, which is normally around 1100 K. Flames with a luminous zone approximately 1 mm long and 200 micron wide are found to be self-sustainable in the reaction channel. The burner is currently being used as a reliable platform to study small-scale flames. However, it has the potential application to micro power generation, fuel reforming, and in situ toxic waste incineration with the capability of integrating electronic, optical, thermal, and fluid systems into one package. The burner design consists of two channels crossing each other at the midpoint. The reaction channel is 1 mm by 1 mm in cross-section. The cross-sectional dimension of the reactants inlet channel is approximately 221 micron wide and 216 micron high. The lengths of the channels are 12.7 mm. The features are constructed by punching and stacking of Dupont 951 green tapes. Thick layers for building up the burner thickness are pre-laminated with isostatic press. The blocks are then laminated using an organic fluid. Metal wires and sapphire windows are integrated into the burner for spark ignition and optical accessibility, respectively. Spectroscopy and micro particle image velocimetry are performed to resolve the species and flow fields in the reaction zones. Flow strain rates are varied to study flame extinction at the sub-millimeter scale of these burners.|
|Ming-Hsun Wu, Student
The Pennsylvania State University
University Park, PA