An Experimental Study on Two-Phase Flow and Coolability of Particulate Beds Packed with Multi-Size Particles
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
C6-1 Debris Bed Cooling

Liangxing Li (Royal Institute of Technology)
Sachin Thakre (Royal Institute of Technology)
Weimin Ma (Royal Institute of Technology)


This paper presents the results of an experimental study on the friction laws of two-phase flow and coolability in a volumetrically heated particulate bed packed with multi-size particles. The pressure gradients and dryout heat fluxes of the bed are measured for both top-flooding and bottom-fed schemes. The bottom-fed scheme is driven by forced injection of water from the bottom of the bed. Moreover, a varied configuration of the bed with a downcomer is employed to investigate the effectiveness of natural circulation-driven coolability (NCDC). The results show that at top-flooding conditions, both the pressure gradient and the dryout heat flux of the bed can be predicted by the Reed model. The coolability is enhanced by the bottom-injection and the downcomer, and the dryout heat flux rises significantly with increasing water velocity of bottom- injection.

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