著者

飯田 嘉宏

出版者

社団法人 日本伝熱学会

雑誌

伝熱 (ISSN:13448692)

巻号頁・発行日

vol.38, no.152, pp.25-26, 1999 (Released:2010-12-16)

著者

飯田 嘉宏

出版者

公益社団法人 計測自動制御学会

雑誌

計測と制御 (ISSN:04534662)

巻号頁・発行日

vol.11, no.2, pp.228-239, 1972 (Released:2009-11-26)

参考文献数

8

著者

飯田 嘉宏 高島 武雄

出版者

社団法人 日本流体力学会

雑誌

日本流体力学会誌「ながれ」 (ISSN:02863154)

巻号頁・発行日

vol.7, no.3, pp.203-211, 1988-09-30 (Released:2011-03-07)

参考文献数

19

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Vapor explosion phenomena and recent experimental studies on the microscopic mechanism of them are described.The vapor explosion accidents in metal and pulp industries are reviewed. The explosions occurred in the SL-1 reactor and the Chernobyl power reactor station are also said as the vapor explosion. The experimental results are summarized and the necessitive four stages for the occurrence of a large scale vapor explosion are shown. The spontaneous nucleation theory and the thermal detonation theory, which are the typical models of the vapor explosion, are explained.Vapor explosion experiments using single drops of molten LiNO3 submerged in ethyl alcohol are described. High-speed films of explosion configuration are compared with the induced pressure traces and the pressure is found to be the control factor of the phenomena. The propagation stage, which is important for a large scale vapor explosion, is photographed in plural drops experiments. A qualitative model of vapor explosion is presented.

著者

飯田 嘉宏 筒井 健太郎

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.55, no.509, pp.194-199, 1989-01-25

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The effect of ultrasonic wave application on film boiling heat transfer is investigated. A series of heat-transfer experiments are carried out using a fine heater made of a 0.20-mm-dia. horizontal platinum wire, which is immersed in saturated ethyl alcohol and exposed to a 28 kHz ultrasonic wave. The heat-transfer coefficient increases with the increase of power supplied to a ferrite-type vibrator and it is doubled for the maximum in this experimental condition. The minimum heat-flux point is also improved. At a lower degree of superheat than the MHF line, nucleate boiling and film boiling coexist separately along the platinum wire with a high reproducibility. The film boiling configuration is also observed through photograpty. Under a high intensity of ultrasonic wave, many tiny bubbled begin to generate and the shapes of large bubble becomes rather irregular.