Particle-resolved numerical study of the forced convection heat transfer characteristics of an endothermic-biomass particle placed in supercritical water crossflow
| Autor: | Zhenqun Wu, Hui Jin, Guobiao Ou, Liejin Guo, Yifei Ren |
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| Rok vydání: | 2020 |
| Předmět: |
Work (thermodynamics)
Materials science 060102 archaeology Renewable Energy Sustainability and the Environment 020209 energy Biomass 06 humanities and the arts 02 engineering and technology Mechanics Heat capacity Endothermic process Supercritical fluid Fuel gas Heat transfer 0202 electrical engineering electronic engineering information engineering Particle 0601 history and archaeology |
| Zdroj: | Renewable Energy. 158:271-279 |
| ISSN: | 0960-1481 |
| DOI: | 10.1016/j.renene.2020.05.104 |
| Popis: | Biomass gasification in supercritical water (SCW) for high energy density gas fuel is a promising method for the efficient usage of biomass resource. Researches have indicated that the gasification efficiency is greatly depended on the heat transfer rate during the practical process of cold biomass particle injected into SCW. So the study of the forced convection heat transfer characteristics of an endothermic-biomass particle placed in SCW crossflow is of great significance. Moreover, the study of the particle surface local heat transfer rate distribution is also necessary for the complete gasification of biomass particles in SCW. Therefore, this work performs particle-resolved direct numerical simulation study on SCW flow past an endothermic sphere. Results demonstrate that the heat transfer gets great enhancement when the heat transfer temperature range comprises the large specific heat capacity zone. For the particle surface local heat transfer distribution, the enhancement at the front of particle is much stronger than that at the rear. Furthermore, the heat transfer characteristics under different pressures are also studied. In the end, a new forced convection heat transfer correlation applicable for SCW flow past an endothermic sphere is obtained. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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