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PERIODIC AND QUASIPERIODIC TEMPERATURE OSCILLATIONS IN MIXED CONVECTION

Schmeling, Daniel and Bosbach, Johannes and Wagner, Claus (2012) PERIODIC AND QUASIPERIODIC TEMPERATURE OSCILLATIONS IN MIXED CONVECTION. 23rd International Congress of Theoretical and Applied Mechanics (ICTAM2012), 19. - 24. Aug. 2012, Peking, China.

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Official URL: http://www.ictam2012.org/

Abstract

We report on temperature oscillations which we observed during experiments in turbulent mixed convection at Ra=2.0x10e8 in a rectangular enclosure with a length of L=2500 mm and aspect ratios of L/H=5 (length over height) and W/H=1 (width over height), heated from below and cooled from above. The measurements were conducted using an arrangement of PT-100 temperature sensors. Depending on the Reynolds number of the flow entering the cell, and thus the Archimedes number, we detected stable flow conditions as well as quasiperiodic and periodic oscillations in the temperature field. Comparison with smoke visualisations allowed us to ascribe the respective temperature distribution to a certain number and arrangement of large scale circulations (LSCs) in the flow. We interpret the temperature oscillations, which reach the highest frequency f=2.0x10e-3 1/s at Ar=1.8, as motions of the LSCs in longitudinal cell direction.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:Abstract Book of the 23rd International Congress of Theoretical and Applied Mechanics, Page: 311, ISBN: 978-988-16022-3-7
Title:PERIODIC AND QUASIPERIODIC TEMPERATURE OSCILLATIONS IN MIXED CONVECTION
Authors:
AuthorsInstitution or Email of Authors
Schmeling, DanielDaniel.Schmeling@dlr.de
Bosbach, JohannesJohannes.Bosbach@dlr.de
Wagner, ClausClaus.Wagner@dlr.de
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Conference Proceedings on DVD-ROM 1.4G
Status:Published
Keywords:Turbulent mixed convection, Experimental temperature measurements, Temperature oscillations, Large scale circulations
Event Title:23rd International Congress of Theoretical and Applied Mechanics (ICTAM2012)
Event Location:Peking, China
Event Type:international Conference
Event Dates:19. - 24. Aug. 2012
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems & Cabin
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Daniel Schmeling
Deposited On:05 Sep 2012 15:34
Last Modified:05 Sep 2012 15:34

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