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Volume 10 (1961)
- Issue 1 Pages 1-
Volume 10, Issue 1
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Tamotsu HARADA1961 Volume 10 Issue 1 Pages 1-5
Published: 1961
Released on J-STAGE: February 07, 2014
JOURNAL FREE ACCESSThis report confirmed the decrease of ultimate strength, bending elasticity and etc. about the reinforced concrete beams which are heated slowly from all side and warmed uniformly to 200°C-400°C, and then cooled slowly.View full abstractDownload PDF (1444K) -
Kazuo AKITA1961 Volume 10 Issue 1 Pages 6-9
Published: 1961
Released on J-STAGE: February 07, 2014
JOURNAL FREE ACCESSIt may be said that fire flames are a diffusion flame with very small flow rate of fuel.
This flames differ from the usual diffusion flames with large flow rate in that it is not always controlled by the molecular diffusion of fuel and air. In this report, the structure of small stable fire diffusion flames prepared in laboratory are investigated by means of ultraviolet photography, scattered-light photography, emission spectrography, particle track technique and temperature measuring technique (Na line reversal method and Kurlbaum method).
According to these experimental results, the most important part of fire diffusion flame is not the central luminous part of the flame but the blue-green base of the flame. And this part is essential not only to the chemical reaction as a main combustion zone, but also to the physical stabilization of flame as a mixing zone of fuel and air. This fact shows that the fire extinguishing agent must be added directly to this zone in principle.
Moreover, we found that the luminous carbon zone, from which the greater portion of radiation of the fire diffusion flame is emitted, has a hollow shape and the maximum temperatures in this zone of coal gas, wood, gasoline and alcohol diffusion flame are 1650°C, 1540°C, 1420°C and 1565°C respectively. This information is useful for the purpose of calculation of heating by the fire flame.View full abstractDownload PDF (742K) -
Minoru HAMADA, Masaji IKEDA1961 Volume 10 Issue 1 Pages 10-15
Published: 1961
Released on J-STAGE: February 07, 2014
JOURNAL FREE ACCESSFire protectivity of some covering materials used in steel skeleton construction are tested in based on Japan Industry Standard.
Wall : Seven kinds of coverings (mortaring lath, mortaring cemented excelsior board, cement-asbestos board with galvanized sheet iron, sandwich board by cement-asbestos board and pearlite mortar, Durisol with galvanized sheet iron, and pearlite mortar finished on metal lath) were tested by Outdoor 2nd Class in JIS (A-1302), and two kinds of covering (flexible cement-asbestos board and galvanized sheet iron) were tested by Outdoor 3rd Class, temperatures of steel skeleton surface were under 450°C having sufficient allowance in the case of every covering. So, the construction that used these coverings passed in this test. On fire protective covering that used indoor finish, six kinds of coverings (mortaring lath, Plastering cemented excelsior board, Plastering lath board, two kinds of asbestos spraying finish on metal lath, and rock wool spraying finish on lath board) were tested by Indoor 2nd Class of JIS. In this case, small cracks were observed on coverings, but temperatures of steel skeleton surface were under 450°C, so passed in this test.
Five kinds of lighter coverings were tested by 1st Class of JIS (A-1321), gypsum boards and cemented excelsior boards did not pass, and flexible cement-asbestos board passed in this test.
Column : Eight kinds of coverings were tested by Indoor 2nd Class of JIS (A-1302), plastering cemented excelsior board, plastering metal lath, asbestos spraying and mortaring lath passed, but steel skeleton only,
Non-finished and the interior filled with vermiculite mortar, flexible cement-asbestos board, and gypsum board did not pass in this test.View full abstractDownload PDF (455K) -
Sizuo YOKOI1961 Volume 10 Issue 1 Pages 16-20
Published: 1961
Released on J-STAGE: February 07, 2014
JOURNAL FREE ACCESSGiving the heat quantity transmitted from unit length of a heat source to an upward current per unit time, the author obtained equations to calculate the distribution of temperature and velocity in the upward current from an infinite line heat source.
The modified vorticity-transfer theory was adopted, because this give results closer to the ones obtained from the experiments than by the momentum-transfer theory. In either case, however the value of eddy viscosity in the upward current did not agree with that of eddy diffusivity.
In this calculation, heat loss by radiation from the upward current and the difference of gas density in the current were neglected. The calculation started from the equation of motion and that of heat transfer in the upward current.
The existence of the similarity in the profiles of horizontal velocity and temperature distributions was ascertained by experiments. From this result, these were transformed from the partial differential form into the ordinary one ; that is, the variable z which represents the height from the heat source was eliminated from the equation.
Vertical distributions of temperature and velocity were obtained by dimensional analysis, and horizontal distributions were derived from calculation by approximation.View full abstractDownload PDF (486K) -
Tomio IZUMI1961 Volume 10 Issue 1 Pages 21-25
Published: 1961
Released on J-STAGE: February 07, 2014
JOURNAL FREE ACCESSFoaming capacity of lime hydrolyzate of keratin protein (Powdered horse hoof) was investigated.
The foaming capacity was measured by the N. O. Clark’s type beating apparatus.1)
A study was made of the effect of the duration of the hydrolysis and of varying the protein, lime and water charge on the foaming capacity of the hydrolyzates.
From the experiments, the following results were obtained :
1) Metaprotein was considered by J. M. Perri et al. 4) on the main foaming constituent in the lime hydrolyzate of soybean protein, from the results obtained by the air bubbling method for the measurement of the foaming capacity.
But the results obtained by the beating method showed that the main foaming constituent was at least not the metaprotein.
2) The amounts of foaming constituents obtained by the lime hydrolysis, were proportional to the amounts of keratin protein and independent of the amounts of water and lime charge, in range the adopted experimental conditions.View full abstractDownload PDF (444K)
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