Title: Mixed convection flow past a horizontal plate
Language: English
Authors: Savić, Ljubomir 
Qualification level: Doctoral
Advisor: Steinrück, Herbert
Assisting Advisor: Kluwick, Alfred
Issue Date: 2006
Number of Pages: 63
Qualification level: Doctoral
The mixed convection flow past a horizontal plate which is aligned under a small angle of attack to a uniform free stream will be considered in a distinguish limit of large Reynolds Re and Grashof number Gr. Two aspects are investigated: the global two-dimensional flow field and the local behavior near the trailing edge.
A hydrostatic pressure difference across the wake induces a correction of the potential flow which influences the inclination of the wake. Thus the wake and the correction of the potential flow have to be determined simultaneously.
However, it turns out that solutions exists only if the the angle of attack is sufficiently large.
Solutions are computed numerically and the influence of the buoyancy on the lift coefficient is determined.
The influence of the buoyancy forces onto the flow near the trailing edge is analyzed in the frame work of the triple deck theory.
The flow near the trailing edge can be decomposed into a symmetric and an anti-symmetric part. The symmetric part can be described by the classical triple deck theory (Stewartson 1969 and Messiter 1970), while for the anti-symmetric one, a new (linear) triple deck problem is formulated. However, it turns out that the pressure of the anti-symmetric part is discontinuous at the trailing edge even on the triple deck scale ($x=O({\mbox{Re}} {-\frac{3}{8}})$). Thus new sub-layers of size $x=O({\mbox{Re}} {-\frac{4}{8}})$ and $x=O({\mbox{Re}} {-\frac{5}{8}})$ are introduced to resolve the discontinuity of the pressure.
Keywords: Grenzschicht; gemischte Konvektion
boundary layer; triple deck; mixed convection
URI: https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-18511
Library ID: AC05032415
Organisation: E322 - Strömungsmechanik und Wärmeübertragung 
Publication Type: Thesis
Appears in Collections:Thesis

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