Numerical Study on the Mixed Convection Heat Transfer between a Sphere particle and High Pressure Water in Pseudo-critical Zone
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Numerical Study on the Mixed Convection Heat Transfer between a Sphere particle and High Pressure Water in Pseudo-critical Zone
- 发表刊物：
- Advance in Mechanical Engineering
- 摘要：
- Mixed convection heat transfer between supercritical water and particles is a major basic problem in supercritical water fluidized bed reactor, but littlework focused on this newarea in the past. In this paper, a numericalmodel fully accounting for thermophysical property variation has been established to investigate heat transfer supercritical water and a single spherical particle under gravity. Flow field, temperature field and Nusselt number are analyzed based on the simulation results. Results show that buoyancy force has a remarkable effect on flow and heat transfer process. When the direction of gravity and flow are opposite, the gravity enhances the heat transfer before the separation point and inhibits the heat transfer after the separation point. When gravity is incorporated in calculation, a higher temperature gradient and a thinner boundary layer in the vicinity of the particle surface are observed before separation point, and the situations are just the reverse after separation point. Variation of specific heat and conductivity plays a main role in determination of heat transfer coefficient.
- 合写作者：
- L. P. Wei, Y.J. Lu, J. J. Wei
- 卷号：
- 2013
- 页面范围：
- 1-10
- 是否译文：
- 否
- 发表时间：
- 2013-02-28