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Volume 22, Issue 4
Displaying 1-4 of 4 articles from this issue
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Shigeki TOYAMA, Hidetoshi MORI, Akira YAMAGUCHI1985 Volume 22 Issue 4 Pages 199-206
Published: April 10, 1985
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo elucidate the effects of particulate fouling on the performance of heat equipment and to provide an idea to eliminate it, the mechanism of particle deposition onto a circular and an elliptical cylinder and a tube bundle in turbulent gas flow was experimentally investigated for various flow conditions using the No. 5, JIS Z 8901 (1974) dust (fly ash) for industrial testing. The relationships between fouling and heat transfer characteristics in elliptical cylinders were also discussed on the basis of boundary layer theory.
The size of deposited particles at the stagnation point of a circular and an elliptical cylinder were found to be coarser than those deposited in the wake zone, and the rate of deposition depended on Reynolds number, the turbulent intensity and the slenderness of the ellipses.
The calculated amounts of heat transfer exhibit maximum values at a slenderness of from 0.9 to 1.0, under the assumptions that the ash deposition zone is completely thermally isolated and the Prandtl number of the fluid is always unity.View full abstractDownload PDF (846K) -
Mitsuo YAMASHIRO, Yasunobu YUASA1985 Volume 22 Issue 4 Pages 207-214
Published: April 10, 1985
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn this study, an experiment related to the breaking hardness of various granular foods is performed using two kinds of hardness testers. The values at the instant when each sample is broken completely are defined as the breaking hardness. The mean, standard deviation, maximum and minimum breaking hardness and its range are evaluated. Furthermore, the histograms of the breaking hardness for all samples are depicted. It is found that those histograms can be expressed approximately as a normal distribution. First, the result is investigated to see whether it could or could not be regarded as a normal distribution using normal probability paper and the X2-test method.
Next, the Weibull probability paper and the X2-test method are applied to see whether it could or could not be regarded as a Weibull distribution. It is clearly shown that the degree of fitness of a normal distribution of the breaking hardness is better than that the Weibull distribution.View full abstractDownload PDF (1734K) -
Tetsuo AKIYAMA, Jing Quan ZHANG, Masabumi EGAWA, Hiromu KOJIMA1985 Volume 22 Issue 4 Pages 215-219
Published: April 10, 1985
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSThis paper deals with the mixing of diatomaceous earth in air mixers. Diatomaceous earth is a powder with a small bulk density. The positive pressure air mixer was found to be effective in mixing the powder. The negative pressure air mixer however, failed to achieve satisfactory mixing. The volumetric change within particulate materials under an induced loading, that is imposed by the incoming air flow into a confined column, was found to be the prime cause of the failure in mixing the powder. It was then demonstrated that the performance of the negative pressure air mixer will be greatly improved if the mixer is operated in a fluidized bed instead of the spouted bed with the proper initial pressure difference and uniform air velocity within the column.View full abstractDownload PDF (507K) -
Kanji IMAGAWA, Makoto OTSUKA, Nobuyoshi KANENIWA1985 Volume 22 Issue 4 Pages 220-230
Published: April 10, 1985
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSDownload PDF (911K)
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