Detection, causes and consequences of convection currents in bulk-stored grain.

Authors

  • C.B.S. Uiso
  • M.C. Gough
  • C.J. Stigter

DOI:

https://doi.org/10.18174/njas.v38i2.16604

Abstract

A simple theoretical model was derived to predict velocities of intergranular cyclic air convection currents in bulk stored grain for a given temp. difference between outer and inner vertical regions of the bulk. Using a tracer gas, the measured airflow in a laboratory simulation was found to be in good agreement with theoretical predictions for differences in the range 17-25 degrees C. In tropical field trials in a metal silo, weather-induced intergranular air convection was detected and quantified in practical bulk storage. Significant m.c. increases, proven here to be due to convective air transported moisture, were observed in the top of the grain bulk in laboratory and field experiments. In both cases, troublesome head space condensation occurred. A new way of reducing observed grain damage due to moisture is proposed and the scope for future academic work indicated. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Published

1990-06-01

Issue

Vol. 38 No. 2 (1990)

Section

Papers

License

© Copyright KLV All rights reserved. The copyright covers the exclusive right to reproduce and distribute the contribution, including reprints, translations, photographic reproductions, microform, electronic form (offline, online), or any other reproductions of similar nature. The Author may publish his/her contribution on his/her personal Web page provided that he/she creates a link to http://library.wur.nl/ojs/index.php/njas and that together with this electronic version it is clearly pointed out, by prominently adding "© KLV", that the copyright for this contribution is held by KLV. The full-text version may be available from the Author's Web page only after a delay of 12 months following the publication of the paper, whereas such a delay is not required for the abstract.