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PREDICTION OF BUBBLE ENTRAINMENT BY ROUGH MESH ANALYSIS AND EXPERIMENTAL MAP

T. Hagiwara
Nuclear Engineering Research Laboratory, Faculty of Engineering, University of Tokyo, Tokai-mura, Naka-gun, Ibaraki, Japan

Haruki Madarame
Nuclear Engineering Research Laboratory, The University of Tokyo, Tokai-mura, Ibaraki 319-1188, Japan

Sinopsis

In the design of an LMFBR (liquid metal fast breeder reactor), it is important to know the movement of the free surface in a tank. Thus the authors developed a computer code for analyzing the two-dimensional turbulent flow with a free surface based on the VOF (volume fraction of fluid) and compared the computed results with those of the experiments. But it is not practical to compute such phenomena only by numerical analysis. For the size of reactor components is 10m but one of bubbles is 0.01m, so we need to use very fine mesh and require much amount of memory and cpu time. We complemented numerical analysis with experimental data. A bubble entrainment depends on local flow pattern near the free surface. We can also compute velocity distribution and surface shape using even rather rough mesh for the size of bubbles. In order to predict a bubble entrainment we first calculate a flow pattern with a numerical analyzing code, and next we judge a bubble entrainment by comparing the computed result with the experimental map. We carried out reference experiments and calculations to verify this method and can predict a bubble entrainment.

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