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Volume 13 (1963 - 196･･･
- Issue 2 Pages 29-
- Issue 1 Pages 1-
Volume 13, Issue 2
Displaying 1-4 of 4 articles from this issue
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Kunio KAWAGOE1965 Volume 13 Issue 2 Pages 29-35
Published: 1965
Released on J-STAGE: October 15, 2013
JOURNAL FREE ACCESSTo estimate the fire endurance of building elements, it is important to know the temperature history of them during fire exposure, but it is not so easy to solve this problem because of containing of non-liner elements.
Recently Mr. T. Z. Harmathy presented a numerical method to solve this problem. The author attempted to use an electric computer to solve one by same method assuming that the value of heat conductivity changes with temperature and containing water evaporates without moving to anywhere in the wall.View full abstractDownload PDF (445K) -
Shoichi HOSHINO1965 Volume 13 Issue 2 Pages 36-41
Published: 1965
Released on J-STAGE: October 15, 2013
JOURNAL FREE ACCESS -
Shigenobu SŌMA, Yasuo YAHATA1965 Volume 13 Issue 2 Pages 42-48
Published: 1965
Released on J-STAGE: October 15, 2013
JOURNAL FREE ACCESSThe purpose of this experiments was to determine on the decrease of electric resistance of a vinyl cord covering through heating.
As material a vinyl flat cord covering on the market and poly vinyl chloride were used. These materials were heated in the flame of alcohol-lamp or the electric furnace under 100°C～900°C. The measurement of electric resistance and chemical analysis of these calcined products were tested.
The results obtained were as follows,
(1) Hydrogen chloride from calcined poly vinyl chloride in a vinyl cord covering remained as hydrochloric acid and formed calcium chloride in a vinyl cord covering.
(2) The electric resistance of calcined vinyl cord covering decreased less than that of calcined products from poly vinyl chloride for the presence of these hygroscopic products.View full abstractDownload PDF (572K) -
Sizuo YOKOI1965 Volume 13 Issue 2 Pages 49-55
Published: 1965
Released on J-STAGE: October 15, 2013
JOURNAL FREE ACCESSThe experimental studies in thermal convection from a line burner was already performed by A. O. Rankine and some discussions about the results were made by Dr. P. H. Thomas, This is a very difficult problem to solve exactly, but so far as the approximate solution is concerned, Rankine’s similarity theory and Thomas’ dimensional analysis are very excellent and useful.
Now, the similar results in the case of a rectangular heat source are wanted. The author has first begun the similar experiment on a line heat source of high temperature, made by burning alcohol and attempted to compare the results with Rankine’s low temperature case. The experiment was performed in a brief wind tunnel. Alcohol was burned in the vessel 85cm. long and 1cm. wide. This vessel was placed in the wind tunnel, orienting its longer side perpendicular to the wind direction.
The results are summarized as follows :
(1) The total heat quantity contained in the flow, is estimated to be 70～80% of the heat produced by the combustion of alcohol. But this contained heat is lost gradually through the floor and the wall of the tunnel. At the point 100cm. downwind of the source, the heat quantity contained in the flow is estimated to be 40～50% of the initial heat quantity.
(2) The measured vertical temperature distribution (x≧20cm.) in the flow is fitted better to the curve represented in φΩ1/4 and (z/x)Ω3/4 coordinates than to the one represented in φΩ-0.14 and (z/x)Ω3/4 coordinates.
(3) The wake is performed behind vessel of alcohol and so in the region very near to the heat source, the heat is diffused distorting to the downward. In this region, the temperature distribution approaches to the one from a plain heat source rather than from a line heat source.
(4) The above mentioned results are obtained on the assumption that the local wind velocity in the tunnel and the density of the hot gas does not vary from the unheated condition. This is not strictly correct and the author admits that the results obtained are the only approximate solution.View full abstractDownload PDF (615K)
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