著者

古谷 正裕 稲田 文夫

出版者

一般社団法人 日本原子力学会

雑誌

日本原子力学会和文論文誌 (ISSN:13472879)

巻号頁・発行日

vol.3, no.2, pp.141-150, 2004-06-25 (Released:2010-03-08)

参考文献数

13

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Experiments were conducted to investigete two-phase flow stability of a natural circulation BWR due to flashing at low pressure. The facility used in the experiment was designed to have non-dimensional values which are nearly equal to those of typical natural circulation BWR. The observed instability is suggested to be the flashing induced density wave oscillations, since the oscillation period was nearly one and a half to two times the passing time in the chimney section, and correlated well with a single line regardless of system pressure, heat flux, and inlet subcooling. Stability maps were obtained in reference to the core inlet subcooling and the heat flux at the system pressures of 0.1, 0.2, 0.35, and 0.5MPa. The flow became stable below a certain heat flux regardless of the channel inlet subcooling. The stable region enlarged with increasing system pressure. According to the stability map, the stability margin becomes larger in a startup process of a reactor by pressurizing the reactor sufficiently before withdrawing control rods.

著者

稲田 文夫 米田 公俊 森田 良 藤原 和俊 古谷 正裕

出版者

公益社団法人 腐食防食学会

雑誌

Zairyo-to-Kankyo (ISSN:09170480)

巻号頁・発行日

vol.57, no.5, pp.218-223, 2008 (Released:2008-11-08)

参考文献数

12

被引用文献数

2 6

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配管減肉に対する流体現象の寄与について説明した.流れ加速型腐食(FAC)とエロージョンでは,壁面への流体作用力が全く異なることを示した.FACの主要因子である乱流物質移動は熱伝達とアナロジがあり,壁面近傍の粘性底層内の分子輸送が支配的とするモデルが実用的である.さらに物質移動は数値流体解析コードで求められる.最後にこれらの手法によりオリフィス,エルボにおける物質移動現象を予測した結果を説明した.

著者

森田 良 稲田 文夫 内山 雄太 梅沢 修一 石橋 雅裕 舩木 達也

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 (ISSN:21879761)

巻号頁・発行日

vol.83, no.849, pp.16-00526-16-00526, 2017 (Released:2017-05-25)

参考文献数

15

被引用文献数

3

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In industrial fields, as the steam is commonly utilized for heat supply, drying process and so on, it is important to be aware of the steam flow rate in the view point of energy management. However, the steam utilized in the factory is usually wet steam condition. Though it is well known that the wetness affects the flowmeter reading, it is difficult to clarify the effects of the wetness in the steam flow quantitatively in actual plants and factories, and thus far, there has been no established method for estimating the error caused by the wetness of steam flow. In this paper, the difference of ultrasonic flowmeter reading due to wetness of the wet steam flow was clarified experimentally. Ultrasonic flowmeter reading in the wet steam flow was compared with Coriolis flow meter installed after heat exchanger in the steam apparatus. As a result, we clarified the flow rate difference of those two flowmeters was increased with increasing wetness, and the ultrasonic flowmeter reading was almost the same as the value of steam phase flow rate in the wet steam flow. We also proposed the correction method of the ultrasonic flowmeter reading by using density correction in the flow rate formula of the ultrasonic flowmeter. And finally, we clarified the uncertainty of the measured flowrates and their differences were less than 1.0%.