Results 281 to 290 of about 298,313 (318)

Rates of Dry Deposition Determined Using Wet/Dry Collectors

Journal of Geophysical Research: Atmospheres, 1985
Daily samples of dryfall were collected during the June 1982 Dry Deposition Measurement Intercomparison Study at Champaign, Illinois, using six Aerochem Metrics wet/dry collectors. Upon completion of the field experiment, these samples were analyzed at the Environmental Measurements Laboratory for pH and for their concentrations of major inorganic ...
H. W. Feely, D. C. Bogen, S. J. Nagourney, C. C. Torquato   +3 more
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A MATHEMATICAL MODEL OF CONVECTION DRYING IN THE FALLING DRYING RATE PERIOD

Drying Technology, 1988
ABSTRACT Both theoretical and experimental drying indicate that it is necessary to know the kinetics of drying of various materials. It has been generally accepted that in the first period of drying the process is analogous to evaporation from a free liquid surface, and thus the drying agent parameters have a significant influence.
E Mitura, S Michalowski, W Kaminski
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Measurement of lyophilisation primary drying rates by freeze-drying microscopy

Chemical Engineering Science, 2003
Abstract The mass transfer processes that influence the rate of primary drying during lyophilisation are characterised by freeze-drying microscopy. A simple diffusion model is shown to describe the observed progress of drying fronts through isothermal, one-dimensional systems of slab and cylindrical geometry.
S. Zhai, R. Taylor, R. Sanches, N.K.H. Slater   +3 more
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Calculation of Moisture Content and Drying Rate during Microwave Drying

Applied Mechanics and Materials, 2013
Convectional dryerswork at high temperature and usually lead to loss of quality for sensitivebiomaterial products (especially in nutrition). In this way the researchersfound the microwave power more effective and suitable for drying processes. Someof microwave drying advantages include the following: short drying time, highquality of product, low ...
Samad Khani Moghanaki, Behnam Khoshandam, Mohammad Hosein Mirhaj   +2 more
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The effect of rate of drying on the drying creep of hardened cement paste

Cement and Concrete Research, 1984
Abstract Tests were performed on miniature, thin-wallm hardened cement paste specimens; specimens under load were dried at various rates, re-wet and then unloaded. Deformation was monitored throughout. Appropriate control specimens for shrinkage/swelling, basic creep and weight change were also tested.
R.L. Day, P. Cuffaro, J.M. Illston
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Studies of Drying-rate Equations based on Uniform Drying Models

広島大学水畜産学部紀要, 1977
各種の食品乾燥装置を設計し,制御化などを行なっていくためには,簡単な乾燥モデルに基づいた乾燥速度式を設定し,それに含まれる速度パラメータを求めていくことが必要である。 既報7)において,殻状乾燥モデルに基づく乾燥速度式の設定について報告してきた。本報は,均一乾燥モデルに基づく乾燥速度式を設定する研究を行ない,寒天,にんじんならびに炊飯米を例として速度パラメータを算出して,両乾燥モデルの適用性について検討したものである。 均一乾燥モデルに基づく乾燥速度式として,乾燥表面積を簡単な近似式で仮定して表わした場合と,それが未消失含水量のべき乗で関係づけられるとした場合とを仮定した。両者の計算結果はよく似た結果になり,乾燥装置の設計などに対しては簡単なだけ後者が有用と考えられた。乾燥速度は,寒天とにんじんでは,
Kubota, Kiyoshi, Suzuki, Kanichi, Hosaka, Hideaki, Hosokawa, Yoshihiko, Hironaka, Kazunori   +4 more
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Drying wheat in two foot beds I: Rate of drying

Journal of Agricultural Engineering Research, 1968
Abstract The rates of drying of 83 beds of freshly harvested wheat are reported. Each bed, 2 ft deep, was dried from either 35 or 45 to 13·6% m.c. (d.b.) by parallel through-flow, heated air. Typical progress of drying data are given. The effects of changes in the rate of flow and the temperature of the drying air on drying rate are analysed ...
R.G. Clark, W.J. Lamond
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Studies of Drying-rate Equations based on Drying-shell Models

1976
食品の乾燥は，貯蔵とか輸送を容易にすることから，食糧問題を考えていく場合に重要になる単位操作の一つである。各種の乾燥装置を設計し，制御化などを行なっていくためには，乾燥速度式を設定し，それに含まれる速度パラメータを求めていくことが必要である。 一般に食品において，乾燥特性曲線を描いた場合，恒率および減率期間が明確でないが，この原因として食品に特有の表面収縮現象などが考えられる。また，食品は多種にわたる高分子成分によって構成されていて化学的，物理的な性質が単純でなかったり，細胞構造を有しているものが多いことなどからも，水分移動機構などが複雑である。これらの食品に特有な現象を一つずつ究明しながら乾燥速度式を設定していくべきであるが，再現性のよい実験データを得るのが困難であることなどにより容易でない ...
Kubota, Kiyoshi, Suzuki, Kanichi, Hosaka, Hideaki, Hirota, Reiko, Ihara, Kiyoshi   +4 more
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Prediction of the drying rate of transformer insulation during the dry cycle

Electric Power Systems Research, 1992
Abstract A mathematical model is presented in this study for representing the drying process of transformer insulation. The model is a simplified version of the classical Fick's law of diffusion. It is employed to estimate the effective diffusion coefficient of the insulation. With a proper choice of diffusion coefficient, the model has been shown to
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Limits to the Rate of Drying of Materials

1985
The literature on process drying is dominated by the concern for drying kinetics as a basis for sizing process plants. Yet not always are these kinetics the sole or principal factor in limiting drying. The extent of drying is better described in terms of dimensionless parameters such as the number of transfer units (NTU) or loading ratio.
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