elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

Stability of Parallel Non-Newtonian Flows

Sarma, G.S.R. and Özgen, S. (1997) Stability of Parallel Non-Newtonian Flows. GAMM Jahrestagung, Prag, 27.-31. Mai 1996.

Full text not available from this repository.

Abstract

De-/anti-icing fluids are sprayed on aircraft wings to prevent dangerous loss of performance due to ice formation. The residual layers of such fluids which may either be of newtonian or non-newtonian character could also adversely effect the performance of the aircraft. Therefore it is important to investigate the stability characteristics of such fluids. Stability problem for non-newtonian fluids (power-law fluids in particular) has been solved using the linear stability theory for the case of nearly parallel flows. Orr-Sommerfeld equation for power-law fluids has been obtained. The linear stability theory yields an eigenvalue problem which is solved by the so called shooting method. In this method, two asymptotical solutions for the eigenfunctions are constructed at the edge of the boundary layer and Orr-Sommerfeld equation is integrated towards the wall using these two solutions as the initial values of the integral. At the wall, no slip boundary conditions have to be satisfied and the eigenvalues are computed by the Newton iteraction method. The parameter sets defining the stable and unstable regimes have thus been distinctly identified. The same method is also shown to be applicable to two-layer Couette flow and semi-infinite configurations in which either both or at least one layer is constituted by a power-law fluid

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Stability of Parallel Non-Newtonian Flows
Authors:
AuthorsInstitution or Email of Authors
Sarma, G.S.R.UNSPECIFIED
Özgen, S.UNSPECIFIED
Date:1997
Volume:I
Page Range:pp. 249-250
Editors:
EditorsEmail
ZAMM, UNSPECIFIED
Series Name:Vol. 77
Status:Published
Keywords:non-newtonian flows
Event Title:GAMM Jahrestagung, Prag, 27.-31. Mai 1996
Organizer:GAMM
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:41

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.