Convective Instability of a Steady Flow in an Annulus Caused by Internal Heat Generation
| Autor: | Valentina Koliskina, Andrei Kolyshkin, Ilmārs Iltins, Inta Volodko |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Multidisciplinary
General interest 020209 energy Science Flow (psychology) 02 engineering and technology Mechanics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics collocation method Convective instability 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Annulus (firestop) Internal heating boussinesq approximation linear stability |
| Zdroj: | Proceedings of the Latvian Academy of Sciences. Section B, Natural Sciences, Vol 74, Iss 4, Pp 293-298 (2020) |
| Popis: | Linear stability of convective motion in a tall vertical annulus was analysed in the paper. The base flow was generated by a non-uniform distribution of heat sources in the radial direction. The base flow velocity and temperature were obtained analytically solving the system of Navier-Stokes equations under the Boussinesq approximation. The linear stability problem was solved for axi-symmetric and asymmetric perturbations by a collocation method based on the Chebyshev polynomials. Numerical results showed that there were three destabilising factors: (1) increase of the gap between the cylinders, (2) increase of the density of internal heat sources towards to the outer boundary of the annulus and (3) increase of the Prandtl number. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|