All issues
Volume 6 (1976)
- Issue 2 Pages 4-
- Issue 1 Pages 4-
Volume 6, Issue 1
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
Dirt of Sawdust FloorFujio TARUI, Denzo SAHARA, Takashi TSURUSAKI1976 Volume 6 Issue 1 Pages 4-9
Published: January 30, 1976
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThis investigation was carried out to obtain some data for dirt of sawdust floor in fattening cattle barns. We observed and continued to recording the dirty degree of sawdust using the dirty number 1 to 4 for one year since april 1974.
The results obtained were summarized as follows:
1) The degrees of dirt of sawdust floor were shown in Fig. 8, and it was considered that cattle were able to be raised in the sawdust floor without supplying or changing sawdust for about 2 or 6 months.
2) The higher degree of dirt was observed in summer as compared to that in spring.
3) The favorable area per one cattle was found to be 6 to 10m2. Furthermore, sawdust-supplying should be required to the floor when the dirt of sawdust floor reached to “degree 4”.View full abstractDownload PDF (3275K) -
On the Physical Properties of GrainsTomoyuki SENO, Tomoharu YAMAGUCHI, Yoshiyasu AIHARA, Shunichi KOHARA1976 Volume 6 Issue 1 Pages 10-18
Published: January 30, 1976
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSA knowlege of the physical and thermal properties of grains is essential in the design of machines and structures for production, handling, and processing agricultural products. The absolute magnitudes of the physical properties of grains must be evaluated as a function of moisture content.
For the point of view, this investigation was carried out to obtain some basic data for physical properties of grains; rough rice, milo, and yellow dent corn.
Experiments were taken for size and shape factor, density, coefficient of friction, and thermal conductivity with different moisture content of the grains. These results were discussed by reference of published data.
The results obtained are summarized as follows: Each physical prorerties, except size and shape factor, were influenced significantly by the moisture content of the grains, and expressed with the linear function. Therefore, regression analysis was applied to all data to determine the effect of moisture content on the physical properties. The regression equations determined for predicting physical properties were presented in part IV.View full abstractDownload PDF (949K) -
On the Qualitative CharacteristicsYoshiyasu AIHARA, Tomoharu YAMAGUCHI, Masayoshi MINOWA1976 Volume 6 Issue 1 Pages 19-26
Published: January 30, 1976
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSThe authors carried out the experimantal studies on heat-transfer characteristics of an air-flowing layer in the double-wall of livestock barn, using a laboratory scale model of the wall construction. The results obtained are summarized as follows.
1) The charactaristics of natural convective heat-transfer in air-flowing layer became similar to those of forced convective heat-transfer when the thickness (d) of the air flowing layer, 7.5cm≥d≥2.5cm, was decreasing.
2) Under the condition of natural air-flow, influence of incline angle of the air-flowing layer on convective heat-transfer coefficients (α) could be regarded as effect of air velocity.
3) In case of forced air-flow, the coefficients (α) at d=2.5 and 5.0cm were little different from each other, but their values and the increasing rates of α with air velocity were greater than the ones at d=7.5cm.
4) The coefficients α at forced air-flow seemed to be influenced with the interference zone between two thermal boundary layers formed on each inner wall-surfaces.
5) From the relationship between Nusselt number and Reynolds number, the heat-transfer characteristics under natural air-flow were seemed to be different from the ones under forced air-flow at d=7.5cm. These tendency did not appear at d=2.5 and 5.0cm.
6) Thermal insulating ability of the wall having air-flowing layer was seemed to increase only when the heat flow direction on the lower temperature wall surface was from the surface to the air.View full abstractDownload PDF (879K) -
Takaaki MAEKAWA, Shigeru YOSHIZAKI, Shingo YAMAZAWA, Shotaro YUZAWA, M ...1976 Volume 6 Issue 1 Pages 27-32
Published: January 30, 1976
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSUsing the suction type pneumatic conveying dryer with vertical drying pipe (1.5B) of 4m length, the chopped grass was dried under the conditions of drying air temperature to the extent of 200-400°C. The following results were obtained;
(1) It was shown in following equation that the relation between the terminal velocity (Vt) and moisture content (M) of chopped grass became linear equation;
Vt=1.53×13-3·M+1.97
where, M: moisture content (%, d. b.)
(2) In the case of drying air temperature conditions to the extent of 200-350°C, it was found scorching smell of the grass occured when the moisture content was below 200% (d. b.), and in the case of drying air temperature about 390-400°C, the scorching befell to near the 200% (d. b.) moisture content.
(3) The Nusselt number of drying chopped grass by pneumatic conveying dryer was extremly larger than thaht of vaporizing the single spherical water particle. The following phenomenon could be proposed; The agitation effect of both drying air and materials occured in putting the chopped grass into the drying pipe.View full abstractDownload PDF (534K) -
Hiroto HAKURA1976 Volume 6 Issue 1 Pages 33-39
Published: January 30, 1976
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (940K) -
Kazuhide TSUGE1976 Volume 6 Issue 1 Pages 40-44
Published: January 30, 1976
Released on J-STAGE: September 05, 2011
JOURNAL FREE ACCESSDownload PDF (477K)
- |<
- <
- 1
- >
- >|