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19 巻, 10 号
選択された号の論文の6件中1～6を表示しています
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高橋 実, 鈴木 傑, 小林 種雄1982 年 19 巻 10 号 p. 567-576
発行日: 1982/10/10
公開日: 2010/04/30
ジャーナル フリーSeveral filling mechanics act simultaneously at powder compression, although it may be probable that one is dominant at a certain stage of compression or for a particular powder bed. Cooper assumed that there are several types of holes in a powder bed corresponding to these mechanics. A fractional volume change attributed to the filling of the same type of holes is represented as an exponential function of the reciprocal compression force with an inherent constant. Then the overall volume change could be obtained from the sum of them. We generalized the lumped constant form (Eq. (I)) by Cooper to the distributed as shown in Eq. (II).
V*=V0-V/V0-V∞=Σni=1ai·exp(-ki/P) (Σni=1ai=1) (I)
V*=V0-V/V0-V∞=∫∞0f(k)exp(-k/P)dk (∫∞0f(k)dk=1) (II)
Eq. (II) is a Laplace integral which is easy for mathematical treatment. It was shown that several experimental compression equations re-formed to V* could be approximated by the substitution of the Weibull distribution function for f (k).
From a standpoint of decrease in unfilled holes, we proposed a generalized Ballhausen's equation (Eq. (III)) parallel to Cooper's. Using several equations, we could obtain h (t) analytically which is defined as the inverse Laplace transformation of V*. It was understood by the examination of h (t) that Kawakita's equation is essentially identical to that of Athy's.
V*=1-V*=V-V∞/V0-V∞=∫∞0h(t)exp(-tP)dt (∫∞0h(t)dt=1) (III)
After some considerations, it was pointed out that a constant k in Eq. (II) should be comprehended as an apparent stress barrier and a constant t in Eq. (III) as an apparent elastic compliance.抄録全体を表示PDF形式でダウンロード (1130K) -
神保 元二, 徐 胎洙, 椿 淳一郎, 山崎 昌男1982 年 19 巻 10 号 p. 576-582
発行日: 1982/10/10
公開日: 2010/04/30
ジャーナル フリーThe mechanism of classification in a Sturtevant-type air classifier was investigated experimentally in the range of low feed rate, for making the effect of particle concentration on air stream negligible.
The number of revolutions of the blades, as well as that of the distribution plate, and the feed rate of the powder were selected as operating variables. JIS No. 2 standard powder (silica sand with average size dp≈30μm) was used as the material to be tested. Experimental results were expressed by fractional recovery (separation) curves, in which partition phenomena, that is to say the simple dividing of feed particles into two parts, in both finer and coarser ranges of curves were recognized in all cases. In particular, the partition on the finer side had a noticeable effect on the cut size of the product by this classifier.
The findings were as follows:
1) Modified Molerus equation, which took into account of the partition ratio in both finer and coarser sides (α and β), well represented the results of classification as far as the experimental conditions of this work are concerned.
2) It was found that the effect of feed rate on the results of classification was larger than that of the number of revolutions. In the range of low feed rate, the effect of α was also larger than that of β.
3) Cut size, X50, was found to be correlated with partition ratio, α, α was then correlated with the number of revolutions and the feed rate.
4) The parameter representing the sharpness of classification, S, was constant irrespective of the operating conditions of the classifier.抄録全体を表示PDF形式でダウンロード (790K) -
滝川 具弘, 吉崎 繁1982 年 19 巻 10 号 p. 582-591
発行日: 1982/10/10
公開日: 2010/04/30
ジャーナル フリーThe minimum ignition temperatures of agricultural and carboneous dusts having various volatile contents were measured. Unsteady mass and heat balance equations were developed for a dust cloud plunged into the furnace apparatus. Experimental results show that powdered rice husk having a volatile content of 62% gives the lowest ignition temperature, and dusts having higher volatile content give higher ignition temperature. The measured ignition temperature generally increases with increase in particle size. The equations were numerically integrated, and the calculated ignition temperature is in relatively good agreement with the measured one for particle less than 120μm. This calculation revealed that the air temperature rise and the residence time in the furnace largely affects the ignition process. It is also concluded that the steady state solution of the ignition temperature is not applicable to the ignition process in the furnace apparatus. By the application of this model to other researchers' data, the effect of the residence time on the ignition temperature was verified.抄録全体を表示PDF形式でダウンロード (1036K) -
佐藤 完司1982 年 19 巻 10 号 p. 592-598
発行日: 1982/10/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (837K) -
中川 寛1982 年 19 巻 10 号 p. 599-601
発行日: 1982/10/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (375K) -
辻 裕1982 年 19 巻 10 号 p. 604-607
発行日: 1982/10/10
公開日: 2010/04/30
ジャーナル フリーPDF形式でダウンロード (1973K)
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