Numerical investigation of buoyancy-induced flow in a sealed rapidly rotating disc cavity
Numerical investigation of buoyancy-induced flow in a sealed rapidly rotating disc cavity
复制标题
密封快速旋转圆盘腔内浮力引起流动的数值研究
DOI:
10.1016/j.ijheatmasstransfer.2019.118860
复制
发表时间:
2020
影响因子:
5.2
通讯作者:
Gao F
中科院分区:
文献类型:
--
作者:
Gao F
This paper presents buoyancy-induced flow for a sealed rotating cavity with rotational Rayleigh number Ra in the range 10 7–10 9. DNS for an incompressible model with the Boussinesq approximation is compared with LES for a compressible gas flow model. The compressible solver’s solutions show the shroud Nusselt number Nu scales with Ra 0.286, in close agreement with the corrected experimental correlation and the Ra 2/7 scaling for gravitational heat convection between horizontal plates, but differs from the Nu∝ Ra 1/3 scaling given by the incompressible solver. The shroud thermal boundary layer thickness, based on the root mean square of the temperature fluctuation, can be estimated with λ∗= 0.5 Nu-1. Velocities scale approximately with Ω a β Δ T. Disc laminar Ekman layer behaviour is confirmed up to Ra= 10 9. An Ekman layer scrubbing effect, associated with the viscous energy dissipation, is considered to be mainly responsible for the difference in Nu between the two solvers at Ra= 10 9, in spite of rather small Eckert number. The analysis of the turbulent kinetic energy budget shows a dominant constant buoyancy production in the core. The use of the incompressible formulation for the considered problem is restricted by the applicable range of the Boussinesq approximation characterised by the buoyancy parameter β Δ T and neglect of viscous heating and compressibility effects characterised by the Eckert number Ec= Ω 2 r m 2/(C p Δ T).
登录
查看更多内容
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
D. Pitz
通讯作者:
D. Pitz
DOI:
--
发表时间:
2017
期刊:
影响因子:
--
作者:
Hui Tang;J. Owen
通讯作者:
J. Owen
DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
D. Bohn;R. Emunds;V. Gorzelitz;U. Krüger
通讯作者:
U. Krüger
DOI:
--
发表时间:
2015
期刊:
影响因子:
--
作者:
Zixiang Sun;D. Amirante;J. Chew;N. J. Hills
通讯作者:
N. J. Hills
影响因子:
8.6
作者:
Robert McDougall Kerr
通讯作者:
Robert McDougall Kerr