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Volume 12 (1982)
- Issue 2 Pages 5-
- Issue 1 Pages 2-
Volume 12, Issue 2
Displaying 1-4 of 4 articles from this issue
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Kiyohiko TOYODA, Takaaki MAEKAWA, Shingo YAMAZWA1982 Volume 12 Issue 2 Pages 5-14
Published: July 30, 1982
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThis invastigation was carried out to estimate the heat transfer coefficient, hP, in packed bed of grain.
In this analysis, Babcock's approximate solution was adopted to calculate the vale of hP.
The following conculsion are drawn from the results of this investigation.
1. The effect of air velocity on the value of hP was arrenged as the relation between Nu and Re, and the following equations were obtained;
glass beads: Nu=0.155Pe0.92 (25≤Re≤170)
rough rice: Nu=0.0198Re1.02 (20≤Re≤95)
barley: Nu=0.477x10-3Re1.99 (34≤Re≤94)
2. The predicted values of temperature at the each bed length from the approximate solution good agree with the measured values.
3. The values of hP in packed bed were lowes than those of single kernel and in packed bed, temperature distribution in particle is negligible over the range of this investigation because the values of Biot No. were smaller than 0.1,
4. Air temperature and bed length effect on the value of hP. In this investgation, however, those effects cannot be analyzed quantitatively. The new model, contains heat loss through the apparatus wall, fluid dispersion and overall heat transfer of particle, should be used to analyze those effects.View full abstractDownload PDF (1028K) -
Increment of Ability of Drying Section by the Method of Half-Drying StorageKiyokazu GOTO, Ritsuya YAMASHITA1982 Volume 12 Issue 2 Pages 15-23
Published: July 30, 1982
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe country elevators in Omi-Hachiman city, Shiga Prefecture were analysed by simulation in order to increase the ability of the drying section.
1. Although the receiving pattern varies with the extension of combine harvesting and the understanding of farmers etc., recently this pattern is stable. Therefore this pattern can be used as input data in simulation of the ability of drying section.
2. In the country elevator of 3000t capacity, the amount of treated paddy in the drying section will rise up to 4500t by applying the method of half-drying storage (paddy is dried to 18% W. B., and temporarily stored as long as allowable in quality).
3. With the increment of amount of received paddy, the average amount of temporary storage increases rapidly, while its maximum amount increases with a curve like S letter
4. The working ratio of drying section is almost proportional to the amount of received paddy, but it varies with the total drying amount (defined in Chapter II).
5. The using state of tanks for temporary storage is one of indexes in selecting the proper received amount of paddy.View full abstractDownload PDF (1105K) -
Yukoh OGURA, Torayoshi KAWAMATA, Hiroshi TAKENAGA, Michihiro NAKAJIMA1982 Volume 12 Issue 2 Pages 24-27
Published: July 30, 1982
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe application of wellwater spray between double roofs of greenhouse is now being used very effectively in the northern part of Kantoh district to disuse the warm air combustion units in winter.
The authors have been measuring the heating characteristics of this system for two years.
1) The indoor air temperature at night is retained 14.2°C above ambient on an average in the coldest period.
2) The vertical temperature distribution at night is sufficiently uniform and the rate of temperature decrease is limited to about one quarter.
3) Total heat loss in the night is composed of the heat flow from soil floor of one third and the sensible heat supply from spray water of two third.
4) The additional cost of the double roofs with spray equipment is more than compensated for by the advantages of fuel and electricity savings in about seven years.View full abstractDownload PDF (508K) -
Tadao ICHIKAWA, Iwao NOTSUKI, Takashi KUWANA1982 Volume 12 Issue 2 Pages 28-36
Published: July 30, 1982
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSVacuum fluctuation during milking, milking rate, efficiency of milking operation and effects on udder health were observed before and after milking equipment was renewed.
The main points of the renewal were (1) dropping the set vacuum level, (2) lowing the position of the recording jar, (3) increasing the number of milking units, (4) enlargement of the vacuum pump capacity, (5) narrowing the pulsator ratio and (6) enlargement of the inside diameter of vacuum and milk pipe lines.
The results of the above change in milking equipment in the milking parlor can be summarized as follows:
i) Vacuum drops in the short milk tube during maximum milking rate were not so great in the new equipment.
ii) The milking rate for individual cows became slightly slower; however, the total time for milking operation and the number of cows milked per man-hour were improved after renewal.
iii) The percentage of mastitis quarters in those quarters tested showed no difference between before and after renewal. The average cell count in quarter milk for one month after renewal was still high, though with a tendency towards decline.
iv) Evidence of udder irritation after renewal suggests that it takes several weeks for both animal and operator to adapt to new equipment.View full abstractDownload PDF (1036K)
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