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Transient method to determine the diffusion coefficient of gases
Authors: Singh, Digvir, Muir, W.E. And R.N. Sinha
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Download file: https://library.csbe-scgab.ca/docs/journal/27/27_2_69_ocr.pdf
Published in: CBE Journal » CBE Journal Volume 27 (1985)
Download RAW file: https://library.csbe-scgab.ca/docs/journal/27/27_2_69_raw.pdf
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Description: Determination of the rate of diffusion of gases through beds of granular food products is often a prerequisite to proper monitoring of the keeping quality of various stored products. In controlled atmosphere storage of grains, fruits and vegetables, nitrogen(N2)and carbon dioxide (C02) diffuse through the sealed storage. When fumigants, e.g. hydrogen phosphide and methyl bromide, are allowed to diffuse through a stored food they kill insect pests. To prolong the storage life of high-moisture grain, ammonia (NH3) and sulphur dioxide (S02) are used in near ambient temperature drying operations (Eckhoff and Bender 1983 Lancaster et al. 1974). Using the equations developed by White et al. (1982) to predictC02 production by wheat, Singh et al. (1983) have predicted the locations and the required resolution for a C02-detecting instrument to detect early spoilage in grain bins. To solve these and many other problems in the field of agricultural engineering requires a knowledge of diffusion coefficients of gases through seed bulks. The diffusion coefficient of gases through porous materials can be deter mined by using either a steady-state or a transient method (Cunningham and Williams 1980). In the steady-state method elaborate equipment is required and a quantity of the diffusing gas is wasted before steady state is established. Once steady state is established the diffusion coefficient is calculated using Fick
Keywords: transient method to determine the diffusion coefficient of gases
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Citation: Singh, Digvir, Muir, W.E. and R.N. Sinha 1985. TRANSIENT METHOD TO DETERMINE THE DIFFUSION COEFFICIENT OF GASES. Canadian Agricultural Engineering 27(2):69-72.
Volume: 27
Issue: 2
Pages 69 - 72
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Date: 1985
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Coverage: Canada
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DOI:
Description: Determination of the rate of diffusion of gases through beds of granular food products is often a prerequisite to proper monitoring of the keeping quality of various stored products. In controlled atmosphere storage of grains, fruits and vegetables, nitrogen(N2)and carbon dioxide (C02) diffuse through the sealed storage. When fumigants, e.g. hydrogen phosphide and methyl bromide, are allowed to diffuse through a stored food they kill insect pests. To prolong the storage life of high-moisture grain, ammonia (NH3) and sulphur dioxide (S02) are used in near ambient temperature drying operations (Eckhoff and Bender 1983 Lancaster et al. 1974). Using the equations developed by White et al. (1982) to predictC02 production by wheat, Singh et al. (1983) have predicted the locations and the required resolution for a C02-detecting instrument to detect early spoilage in grain bins. To solve these and many other problems in the field of agricultural engineering requires a knowledge of diffusion coefficients of gases through seed bulks. The diffusion coefficient of gases through porous materials can be deter mined by using either a steady-state or a transient method (Cunningham and Williams 1980). In the steady-state method elaborate equipment is required and a quantity of the diffusing gas is wasted before steady state is established. Once steady state is established the diffusion coefficient is calculated using Fick
Keywords: transient method to determine the diffusion coefficient of gases
Résumé:
Mots-clés:
Citation: Singh, Digvir, Muir, W.E. and R.N. Sinha 1985. TRANSIENT METHOD TO DETERMINE THE DIFFUSION COEFFICIENT OF GASES. Canadian Agricultural Engineering 27(2):69-72.
Volume: 27
Issue: 2
Pages 69 - 72
Contributor:
Date: 1985
Technical field:
Conference name:
Session name:
Other information:
Type:
Format:
Publication type:
Source:
Relation:
Coverage: Canada
Language 1:
Language 2:
Rights:
Notes:
Other files:
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