Journal
POWDER TECHNOLOGY
Volume 342, Issue -, Pages 99-107Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.powtec.2018.09.051
Keywords
PR-DNS; Drag coefficient; Average Nusselt number; Spheroid; Supercritical water
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Funding
- National Key R&D Program of China [2016YFB0600101-4]
- NSFC project [51606040]
- Natural Science Foundation of Jiangsu Province [BK20160677]
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To carry out numerical simulations on the particle-laden supercritical water (SCW), one needs to know drag coefficient (Cd) and average Nusselt number (Nu) of the solid particles in SCW according to the high temperature and pressure conditions. This study conducts particle-resolved direct numerical simulations (PR-DNS) to obtain Cd and Nu of spheroids in SCW whose physical properties significantly change with temperature and pressure. A series of case studies are designed to match different working conditions. Effects of variable physical property parameters of SCW on Cd and Nu of spheroids are discussed. Numerical results show that the variable viscosity of SON plays a more important role in influencing on Cd of spheroids in SCW rather than density, thermal conductivity or specific heat capacity. All these four parameters could affect Nu and the largest effect comes from the specific heat capacity. New correlations of Cd and Nu for spheroids in SON are proposed according to the numerical results which can facilitate the phase coupling in multi-phase flow modellings of SON. (C) 2018 Elsevier B.V. All rights reserved.
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