Use of a TM sub 010 microwave cavity at 2. 45 GHz for aerosol and filament drying

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As part of the development of a generic spray-drying process for aerosol preparation of homogeneous powders of complex metal oxide systems, we have investigated the use of 2.45 GHz power in a high-Q single-mode TM{sub 010} cavity coupled directly to aerosols of aqueous solutions. Partial success was attained with a concentrated solution of ferric nitrate. Although all particulates showed drying, only a few percent of the particles were fully dried prior to collection. The cavity operated at a power level just below that sufficient to cause electric field breakdown in the carrier gas (dry nitrogen). The large inherent dielectric shielding ... continued below

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Pages: (9 p)

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Christiansen, D.E. & Unruh, W.P. January 1, 1991.

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As part of the development of a generic spray-drying process for aerosol preparation of homogeneous powders of complex metal oxide systems, we have investigated the use of 2.45 GHz power in a high-Q single-mode TM{sub 010} cavity coupled directly to aerosols of aqueous solutions. Partial success was attained with a concentrated solution of ferric nitrate. Although all particulates showed drying, only a few percent of the particles were fully dried prior to collection. The cavity operated at a power level just below that sufficient to cause electric field breakdown in the carrier gas (dry nitrogen). The large inherent dielectric shielding of the spherical droplets makes it difficult to couple enough power into an aerosol at 2.45 GHz to overcome the heat loss from individual droplets to the surrounding gas and achieve full particulate drying. The calculated and measured dielectric shielding of a thin cylinder of water aligned with the cavity electric field is very much smaller. We have produced heating rates in water {approximately}600 times more rapid than could be achieved with aerosols. This suggests using 2.45 GHz microwave power for drying extruded filaments and then calcining those dried filaments to ceramic fiber. 3 refs., 4 figs.

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Pages: (9 p)

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OSTI; NTIS; GPO Dep.

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  • 93. annual meeting and exposition of the American Ceramic Society (ACerS), Cincinnati, OH (USA), 28 Apr - 2 May 1991

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  • Other: DE91011420
  • Report No.: LA-UR-91-1355
  • Report No.: CONF-910430--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5855021
  • Archival Resource Key: ark:/67531/metadc1101536

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  • January 1, 1991

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  • Feb. 18, 2018, 3:59 p.m.

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  • May 25, 2018, 5:51 p.m.

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Christiansen, D.E. & Unruh, W.P. Use of a TM sub 010 microwave cavity at 2. 45 GHz for aerosol and filament drying, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1101536/: accessed June 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.