International Journal of Aerospace and Lightweight Structures

doi: 10.3850/S2010428613000688

Simulation of Bubbly Flow in a Vertical Pipe Using Discrete Phase Model

Hongying Li^1,a, Jing Lou¹, Zhi Shang¹ and Hui Tang^{2 1}Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632. ^alih@ihpc.a-star.edu.sg ²School of Mechanical & Aerospace Engineering, Nanyang Technology University, 50 Nanyang Avenue, Singapore 639798. htang@ntu.edu.sg

ABSTRACT

Bubbly flow in water involved thousands of bubbles in a vertical pipe is numerically simulated in this paper. The motions of the bubbles are tracked using a Discrete Phase Model (DPM). The interactions among bubbles are simulated through the model of discrete element method (DEM). The effect of bubble diameter on the bubble flow trajectories is studied. Comparisons are made on the flow field with and without considering bubble-bubble collision. It is found that the flow fields become fluctuated when the bubble diameter is above a critical value. The larger the bubble diameter, the higher the fluctuation is. However, as the bubble diameter is smaller than 3 μm, the flow field acts as no bubbles inside. The inclusion of the bubble interactions makes the flow field more fluctuated. Drag force coefficients with and without considering bubble-bubble collisions are compared.

Keywords: Bubbly flow, Discrete phase model, Bubble trajectory, DEM collision.

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