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Title: Uniform bulk material processing using multimode microwave radiation

Abstract

An apparatus for generating uniform heating in material contained in a cylindrical vessel is described. TE.sub.10 -mode microwave radiation is coupled into a cylindrical microwave transition such that microwave radiation having TE.sub.11 -, TE.sub.01 - and TM.sub.01 -cylindrical modes is excited therein. By adjusting the intensities of these modes, substantially uniform heating of materials contained in a cylindrical drum which is coupled to the microwave transition through a rotatable choke can be achieved. The use of a poor microwave absorbing insulating cylindrical insert, such as aluminum oxide, for separating the material in the container from the container walls and for providing a volume through which air is circulated is expected to maintain the container walls at room temperature. The use of layer of highly microwave absorbing material, such as SiC, inside of the insulating insert and facing the material to be heated is calculated to improve the heating pattern of the present apparatus.

Inventors:
 [1];  [2]
  1. Los Alamos, NM
  2. Madison, WI
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
873165
Patent Number(s):
6104018
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05B - ELECTRIC HEATING
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
uniform; bulk; material; processing; multimode; microwave; radiation; apparatus; generating; heating; contained; cylindrical; vessel; described; 10; -mode; coupled; transition; 11; 01; tm; -cylindrical; modes; excited; therein; adjusting; intensities; substantially; materials; drum; rotatable; choke; achieved; poor; absorbing; insulating; insert; aluminum; oxide; separating; container; walls; providing; volume; air; circulated; expected; maintain; temperature; layer; highly; sic; inside; facing; heated; calculated; improve; pattern; material processing; cylindrical insert; materials contained; uniform heating; absorbing material; aluminum oxide; microwave radiation; substantially uniform; container wall; bulk material; material contained; container walls; cylindrical drum; -mode microwave; uniform heat; sorbing material; /219/

Citation Formats

Varma, Ravi, and Vaughn, Worth E. Uniform bulk material processing using multimode microwave radiation. United States: N. p., 2000. Web.
Varma, Ravi, & Vaughn, Worth E. Uniform bulk material processing using multimode microwave radiation. United States.
Varma, Ravi, and Vaughn, Worth E. Sat . "Uniform bulk material processing using multimode microwave radiation". United States. https://www.osti.gov/servlets/purl/873165.
@article{osti_873165,
title = {Uniform bulk material processing using multimode microwave radiation},
author = {Varma, Ravi and Vaughn, Worth E},
abstractNote = {An apparatus for generating uniform heating in material contained in a cylindrical vessel is described. TE.sub.10 -mode microwave radiation is coupled into a cylindrical microwave transition such that microwave radiation having TE.sub.11 -, TE.sub.01 - and TM.sub.01 -cylindrical modes is excited therein. By adjusting the intensities of these modes, substantially uniform heating of materials contained in a cylindrical drum which is coupled to the microwave transition through a rotatable choke can be achieved. The use of a poor microwave absorbing insulating cylindrical insert, such as aluminum oxide, for separating the material in the container from the container walls and for providing a volume through which air is circulated is expected to maintain the container walls at room temperature. The use of layer of highly microwave absorbing material, such as SiC, inside of the insulating insert and facing the material to be heated is calculated to improve the heating pattern of the present apparatus.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {1}
}