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research-article

Experiment and numerical analysis of mixing process of two component gases in vertical fluid layer

[+] Author and Article Information
Tetsuaki Takeda

University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi, 400-8511, JAPAN
ttakeda@yamanashi.ac.jp

ASME doi:10.1115/1.4041690 History: Received November 05, 2017; Revised October 05, 2018

Abstract

When a depressurization accident of a Very-High-Temperature Reactor (VHTR) occurs, air is expected to enter into the reactor pressure vessel from the breach and oxidize in-core graphite structures. Therefore, in order to predict or analyze the air ingress phenomena during a depressurization accident, it is important to develop a method for the prevention of air ingress during an accident. In particular, it is also important to examine the influence of localized natural convection and molecular diffusion on the mixing process from a safety viewpoint. Experiments and numerical analysis using three-dimensional (3D) CFD code have been carried out to obtain the mixing process of two-component gases and the flow characteristics of localized natural convection. The numerical model consists of a storage tank and a reverse U-shaped vertical rectangular passage. One sidewall of the high-temperature side vertical passage is heated and the other sidewall is cooled. The low-temperature vertical passage is cooled by ambient air. The storage tank is filled with heavy gas and the reverse U-shaped vertical passage is filled with a light gas. The results obtained from the experiments were quantitatively simulated using 3D numerical analysis. The two component gases were mixed via molecular diffusion and natural convection. After some time elapsed, natural circulation occurred through the reverse U-shaped vertical passage. These flow characteristics are the same as those of phenomena generated in the passage between a permanent reflector and a pressure vessel wall of the VHTR.

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