In the concept of BWR-PB with a relatively low power level, the core region is filled with a large number of coated particles, which are directly cooled by boiling light water. It’s significant to understand the two-phase flow characteristics in such a complicated pebble-bed structure. A visualization experiment was carried out to investigate the flow phenomena of steam-water two-phase flow in a pseudo-three-dimensional pebble bed using a high-speed video camera. The pebble bed in the experiment was constructed of hundreds of glass beads and a specially designed stainless heating plate, which was used to simulate the heat-generation of solid particles. Based on our observation, five typical flow regimes were identified to distinguish different phase distribution characteristics: bubbly flow, bubbly-slug flow, slug flow, slug-annular flow and pure annular flow. System pressure, mass flow rate and inlet subcooling were considered as the key influence factors for flow regime transition in the experiment. A flow pattern map for low pressure and low inlet subcooling condition was obtained from the experimental data.
Experimental Investigation on Flow Regime of Steam-Water Two-Phase Flow in a Pseudo-Pebble-Bed
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Wang, X, Zhang, Z, Yan, X, Xiao, Z, & Chen, B. "Experimental Investigation on Flow Regime of Steam-Water Two-Phase Flow in a Pseudo-Pebble-Bed." Proceedings of the ASME 2011 Small Modular Reactors Symposium. ASME 2011 Small Modular Reactors Symposium. Washington, DC, USA. September 28–30, 2011. pp. 221-226. ASME. https://doi.org/10.1115/SMR2011-6511
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