期刊
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
卷 117, 期 -, 页码 130-137出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmultiphaseflow.2019.04.022
关键词
Drag coefficient; Stefan flow; Boundary layer; Multiphase reactive flow
类别
资金
- Swedish Research Council (Vetenskapsradet) [2015-05588]
- Swedish for Gasification Center
- research council of Norway [267916]
- European Union's Horizon 2020 research and innovation programme [764697]
- Norwegian NOTUR program [NN9405K]
- Swedish Research Council [2015-05588] Funding Source: Swedish Research Council
- H2020 Societal Challenges Programme [764697] Funding Source: H2020 Societal Challenges Programme
Particle laden flows with reactive particles are common in industrial applications. Chemical reactions inside the particle can generate a Stefan flow that affects heat, mass and momentum transfer between the particle and the bulk flow. This study aims at investigating the effect of Stefan flow on the drag coefficient of a spherical particle immersed in a uniform flow under isothermal conditions. Fully resolved simulations were carried out for particle Reynolds numbers ranging from 0.2 to 14 and Stefan flow Reynolds numbers from (-1) to 3, using the immersed boundary method for treating fluid-solid interactions. Results showed that the drag coefficient decreased with an increase of the outward Stefan flow. The main reason was the change in viscous force by the expansion of the boundary layer surrounding the particle. A simple model was developed based on this physical interpretation. With only one fitting parameter, the performance of the model to describe the simulation data were comparable to previous empirical models. (C) 2019 The Authors. Published by Elsevier Ltd.
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