TED-AJ03-389 IMPROVED MEASUREMENT METHOD FOR INTERFACIAL AREA CONCENTRATION IN A LARGE DIAMETER TUBE
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概要
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The principle of interfacial area concentration (IAC) measurement has been proposed by Kataoka et al. [1]. According to this principle, measurement methods for local IAC using double-sensor probe or four-senor probe have been proposed. Using these methods, much work has been conducted so far to measure the local IAC along the flow direction. In this study, local IAC measurement in gas-liquid two-phase flow in a large diameter tube was attempted by using double-sensor and four-sensor optical probes. In a large diameter tube, flow regimes can differ from those in a smaller diameter tube and the flow can be multi-dimensional due to the secondary flow. This implies that the flow conditions in a large diameter tube could be far from the assumptions upon which the probe methods are based. Measurements were conducted using an air-water two-phase flow loop in the Japan Atomic Energy Research Institute. The diameter of the test section was 200mm and the L/D ratio was 61.5. Using double sensor optical probes, information on local void fraction and IAC were obtained. From the results, it was found that double-sensor probes could be used for measurement of IAC in a large diameter tube. However, when the liquid velocity was very small, the fraction of missing bubbles turned out to be large, which may have lead to a large measurement error in IAC. To solve this problem, the interfacial measurement theorem relating the local instantaneous interfacial velocity to local measurable velocities has been derived by the solution of vectors. Based on this theorem, a theoretical foundation of the measurement methods for the local instantaneous interfacial direction (namely interfacial normal direction) and the time averaged local IAC using a four-processing scheme was proposed to identify the interfaces and bubbles. With the application of this scheme and the interfacial measurement theorem, recalculation of local IAC in a large diameter tube has been performed. The comparison shows that the previous double-sensor probe method has over-estimated the local IAC under the low liquid flow rate conditions, and the new method could be applicable to IAC measurement in a large diameter tube at low liquid velocities.
著者
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MISHIMA Kaichiro
Research Reactor Institute, Kyoto University
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Mishima Kaichiro
Research Reactor Institute Kyoto University
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SHEN Xiuzhong
Research Reactor Institute, Kyoto University
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NAKAMURA Hideo
Tokai Establishment, Japan Atomic Energy Research Institute
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Shen Xiuzhong
Research Reactor Institute Kyoto University
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Nakamura Hideo
Tokai Establishment Japan Atomic Energy Research Institute
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