000013920 001__ 13920
000013920 005__ 20161115094005.0
000013920 04107 $$aeng
000013920 046__ $$k2016-08-21
000013920 100__ $$aSeddighi, Amirreza
000013920 24500 $$aUse of natural instabilities for enhancement of flow mixing in annuli

000013920 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000013920 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000013920 506__ $$arestricted
000013920 520__ $$2eng$$aA technique has been proposed to increase flow mixing in annuli through efficient vortex generation. Corrugations in the form of axisymmetric ribs have been placed at the walls to modulate the axial flow in a manner which leads to centrifugal instabilities which result in the formation of streamwise vortices. This technique results in only a small increase in the pressure drop, unlike other vortex generation methods. A spectral algorithm based on Fourier and Chebyshev expansions has been used to study the stationary state and its stability. Due to the irregularities of the boundaries, the immersed boundary conditions (IBC) method has been used to enforce the flow boundary conditions. The effects of geometric and flow parameters on the pressure losses and on the stability characteristics have been thoroughly investigated. Characteristics of both the vortex mode and the travelling mode of instability, as well as the region of dominance of each mode, have been determined.

000013920 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000013920 653__ $$a

000013920 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000013920 720__ $$aSeddighi, Amirreza
000013920 8560_ $$ffischerc@itam.cas.cz
000013920 8564_ $$s270282$$uhttps://invenio.itam.cas.cz/record/13920/files/PO.FM07-1.13.129.pdf$$yOriginal version of the author's contribution as presented on CD, XMLout( page 1009, code PO.FM07-1.13.129).
000013920 962__ $$r13812
000013920 980__ $$aPAPER