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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

MEASUREMENT OF LOCAL PARAMETERS OF TWO-PHASE FLOW IN TUBE BUNDLE

Atsushi Kodama
Mitsubishi Heavy Industries, LTD, Japan

Yoshiteru Komuro
Mitsubishi Heavy Industries, LTD, Japan

Yoshiyuki Kondo
Mitsubishi Heavy Industries, LTD, Japan

Azuma Seinosuke
Mitsubishi Heavy Industries, LTD, Japan

Hideyuki Morita
Mitsubishi Heavy Industries, LTD, Japan

Ryoichi Kawakami
Steam Generator Designing Section, Mitsubishi Heavy Industries, Ltd.

Toshifumi Nariai
Mitsubishi Heavy Industries, LTD, Japan

Yoshito Nishikawa
The Kansai Electric Power Co., Inc., Japan

DOI: 10.1615/IHTC16.mpf.023716
pages 6821-6830


Ключевые слова: Two-phase/Multiphase flow, Measurement and instrumentation, Bi-optical probe sensor, visualization, flow regime

Аннотация

Detailed knowledge on two-phase flow characteristics inside tube bundle is essential for properly design steam generators in nuclear power plants or other shell and tube heat exchangers Adiabatic two-phase experiments were carried out by using simulant fluids in a reduced scaled facility of U-bend section. Physical parameters such as void fraction and velocity along U-bend tubes were obtained, and visualization of two-phase flow was conducted.
In addition to the U-bend experiment, short-span tube bundle experiment was carried out in order to visualize two-phase flow passing through tube bundles. In both of the U-bend experiment and the short-span bundle experiment, BOPs (Bi-optical probes) are installed for measuring local void fraction and gas-liquid interfacial velocity. BOP sensor can distinguish liquid phase from gas phase by the difference in refractive indices of two phases. By detecting the delay of the signal between two probes, BOP sensor can measure the interfacial velocity between gas and liquid phases.
The data sets obtained in the U-bend and short-span experiments are planned to be utilized as validation data for simulation code and the same simulation code can be applied to other shell and tube heat exchangers.

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