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Determination of the Residence Time of Food Particles During Aseptic SterilizationThe paper describes a non-invasive method to measure the time an individual particle takes to move through a length of stainless steel pipe. The food product is in two phase flow (liquids and solids) and passes through a pipe with pressures of approximately 60 psig and temperatures of 270-285 F. The proposed problem solution is based on the detection of transitory amplitude and/or phase changes in a microwave transmission path caused by the passage of the particles of interest. The particles are enhanced in some way, as will be discussed later, such that they will provide transitory changes that are distinctive enough not to be mistaken for normal variations in the received signal (caused by the non-homogeneous nature of the medium). Two detectors (transmission paths across the pipe) will be required and place at a known separation. A minimum transit time calculation is made from which the maximum velocity can be determined. This provides the minimum residence time. Also average velocity and statistical variations can be computed so that the amount of 'over-cooking' can be determined.
Document ID
Document Type
Conference Paper
Carl, J. R.
(Lockheed Engineering and Sciences Co. Houston, TX United States)
Arndt, G. D.
(NASA Johnson Space Center Houston, TX United States)
Nguyen, T. X.
(NASA Johnson Space Center Houston, TX United States)
Date Acquired
August 17, 2013
Publication Date
May 1, 1994
Publication Information
Publication: Dual-Use Space Technology Transfer Conference and Exhibition
Volume: 1
Subject Category
Life Sciences (General)
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.
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