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Scaling of Turbulent Mixed Convection under High Pressure

Westhoff, Andreas and Grabinski, Nina and Bosbach, Johannes and Thess, Andre and Wagner, Claus (2007) Scaling of Turbulent Mixed Convection under High Pressure. In: 2007 TU München Fifth International Symposium on Turbulence and Shear Flow Phenomena, 2, pp. 505-510. Elsevier. Turbulence and Shear Flow Phenomena TSFP-5, 2007-08-27 - 2007-08-29, München (Germany).

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Abstract

Measurement of turbulent mixed convection at reduced model size by aerodynamic scaling is a promising approach to simplify the investigation of many technical configurations and offers the potential to make large scale flows accessible on a laboratory scale. First results of an experimental study of turbulent mixed convection in a generic convection cell at ambient and high pressure are reported. The aim of these measurements is to prove the possibility of scaling mixed convection by varying fluid pressure and inflow velocity. We present and discuss results for mixed and forced convection obtained with air as working fluid (Pr � 0.7) at ambient pressure for Gr = 3.52 · 10<sup>6</sup>, Re = 1.1 · 10<sup>3</sup> and thus Ar = 1.81 and at 10 bar with Gr = 3.51 · 10<sup>8</sup>, Re = 1.1·10<sup>4</sup> and thus Ar = 1.83. The scaling theory, which allows to scale the cell, is presented as well as the PIV set up used for measurement at high pressure conditions in the High Pressure Wind Tunnel of Göttingen (HDG) and the convection cell. At elevated fluid pressure a significant increase of the velocity fluctuations was observed. Furthermore for mixed convection a transition of a stable 2D flow into an instationary 3D flow has been found.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Scaling of Turbulent Mixed Convection under High Pressure
Authors:
AuthorsInstitution or Email of Authors
Westhoff, AndreasUNSPECIFIED
Grabinski, NinaUNSPECIFIED
Bosbach, JohannesUNSPECIFIED
Thess, AndreDepartment of Mechanical Engineering, University of Technology Ilmenau
Wagner, ClausUNSPECIFIED
Date:27 August 2007
Journal or Publication Title:2007 TU München Fifth International Symposium on Turbulence and Shear Flow Phenomena
Volume:2
Page Range:pp. 505-510
Editors:
EditorsEmail
Friedrich, RainerUNSPECIFIED
Adams, NikolausUNSPECIFIED
Eaton, JohnUNSPECIFIED
Humphrey, JosephUNSPECIFIED
Kasagi, NobuhideUNSPECIFIED
Leschziner, MichaelUNSPECIFIED
Publisher:Elsevier
Series Name:5th International Symposium on Turbulence and Shear flow Phenomena
Status:Published
Keywords:MIxed Convection, Spatial Scaling, PIV, High Pressure
Event Title:Turbulence and Shear Flow Phenomena TSFP-5
Event Location:München (Germany)
Event Type:international Conference
Event Dates:2007-08-27 - 2007-08-29
Organizer:TU München, Garching, Germany
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Deposited By: Andreas Westhoff
Deposited On:09 Oct 2008
Last Modified:12 Dec 2013 20:32

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