Boundary effects on the drag coefficient and average Nusselt number of a sphere in SCW: A comparative study

被引：12
|
作者：
Xiong, Bo [1 ]
Zhang, Hao [1 ]
An, Xizhong [1 ]
机构：
[1] Northeastern Univ, Sch Met, Minist Educ, Key Lab Ecol Met Multimetall Mineral, Shenyang 110819, Liaoning, Peoples R China
来源：
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS | 2019年 / 102卷
关键词：
Drag coefficient; Average nusselt number; Sphere; Supercritical water; Wall effects; DIRECT NUMERICAL-SIMULATION; WATER FLUIDIZED-BED; SUPERCRITICAL WATER; HEAT-TRANSFER; HYDROGEN-PRODUCTION; MODERATE REYNOLDS; PARTICULATE FLOWS; PARTICLE;
D O I：
10.1016/j.enganabound.2019.02.001
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A comparative study on cold supercritical water (SCW) passing over a hot sphere is carried out using the particle-resolved direct numerical simulation (PR-DNS) to examine the wall effects. Different working conditions are considered to obtain the drag coefficient (Cd) and average Nusselt number (Nu) of hot spheres in SCW whose physical properties significantly change with temperature and pressure. The effects of wall factors on Cd and Nu under two different boundary conditions, namely a stationary one for the fluidized sphere problem and a moving one for the settling sphere problem, are compared and discussed. Numerical results show that Cd and Nu of a sphere in SCW cannot fit the previous correlations for conventional fluids well. Therefore, these correlations are improved for SCW, which are good tools to understand the basic knowledge of SCW.
引用
收藏
页码：1 / 10
页数：10
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