著者

川原 顕磨呂 佐田富 道雄 斉藤 栄俊 佐藤 泰生

出版者

THE JAPANESE SOCIETY FOR MULTIPHASE FLOW

雑誌

混相流 (ISSN:09142843)

巻号頁・発行日

vol.9, no.1, pp.26-36, 1995

被引用文献数

2

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To provide data necessary for modeling turbulent mixing between subchannels in a nuclear fuel rod bundle, three experiments were made in series for equilibrium two-phase flows, in which net mass exchange does not occur between subchannels for each phase. The first one was the measurement of turbulent mixing rates of both gas and liquid phases by a tracer technique, using air and water as the working fluids. Three kinds of vertical test channels consisting of two subchannels were used. The data have shown that the turbulent mixing rate of each phase in a two-phase flow is strongly dependent on flow regime. So, to see the relation between turbulent mixing and two-phase flow configuration in the subchannels, the second experiment, flow visualization, was made. It was observed in slug and churn flows that a lateral inter-subchannel liquid flow of a large scale is caused by the successive axial transit of large gas bubbles in each subchannel, and the turbulent mixing for the liquid phase is dominated by this lateral flow. To investigate a driving force of such large scale lateral flow, the third experiment, the measurement of an instantaneous pressure differential between the subchannels, was made. The result showed that there is a close relationship between the liquid phase mixing rate and the magnitude of the pressure differential fluctuation.

著者

佐藤 泰生 佐田富 道雄 堀田 圭之助 中里 見正夫 世古口 言彦

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.46, no.409, pp.1790-1796, 1980-09-25 (Released:2008-03-28)

参考文献数

8

被引用文献数

1 2

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第1報で提案した管内気ほう流の運動量と熱輸送の理論を実験値をもとに検討した.運動量輸送に関しては液相速度分布と摩擦圧力損失,熱輸送に関しては液相温度分布と熱伝達係数のそれぞれについて予測値と実験値を比較した結果,いずれもよい一致がみられ,理論の妥当性が確かめられた.本理論により摩擦圧力損失と熱伝達係数の断面ボイド率分布への依存性が定量的に明らかになった.

著者

佐藤 泰生 佐田富 道雄 川原 顕磨呂 朝倉 信次

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.57, no.538, pp.1979-1984, 1991-06-25 (Released:2008-03-28)

参考文献数

10

被引用文献数

2 2

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The purpose of this work is to propose an experimental method of a two-dimensional (2-D) two-phase gas-liquid flow. A test channel in which a nearly 2-D, uniform two-phase flow can occur was made. This channel was a vertical, narrow gap space made up of two large concentric pipes. A two-phase air-water flow around a body mounted in the channel was recorded consecutively by a high-speed TV camera, and its void fraction distribution was determined using image processing. Several results for flows around a flat plate, and flows along a straight wall and flows between parallel walls were obtained.

著者

永田 勝秀 片山 幸太郎 東條 秀太郎 佐藤 泰生 松沢 耕介

出版者

公益社団法人 日本口腔インプラント学会

雑誌

日本口腔インプラント学会誌 (ISSN:09146695)

巻号頁・発行日

vol.18, no.2, pp.264-272, 2005-06-30 (Released:2014-11-15)

参考文献数

17

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We prepared two types of bone defect fillers (BDFs) which were made from a mixture of α-tricalcium phosphate (α-TCP) with chitosan or alginate in solution. A solidifier was added to the mixtures. These solutions were then kneaded to be solidified. The solid substances, named chitosan-BDF and alginate-BDF, were implanted in femurs of guinea pig to study the effects of the BDFs on the processes of bone formation by EPMA. The alginate-BDF was surrounded with growing bone from all directions at 6 months after the operation and seemed to have an affinity to the tissues. However, no degraded or absorbed form of the BDF was observed. In contrast, most of the chitosan-BDF was replaced by growing bone at 6 months. The adjacent part of the BDF to surrounding cortical bone was especially well-absorbed, probably due to being involved in a reabsorption process after ossification. According to the data, both BDFs were shown to have excellent mechanical properties for filling bone defects. Especially, the chitosan-BDF would be useful as bone defect filler because of its induction of ossification and its smooth absorption.