Temperature and velocity fields in natural convection by PIV and LIF

Knud Erik Meyer, Poul Scheel Larsen, C. H. Westergaard, F. Guillard

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Natural convection in a cubical cavity (L = 250 mm) filled with water is created by heating a square plate (0.5 L) centred in the bottom wall and by cooling the sidewalls, while the remaining walls are insulated. The Rayleigh number based on cavity side length and temperature difference between plate and cooled walls is 1.4×10^10. The flow is turbulent and is similar to some indoor room flows. Combined Particle Image Velocimetry (PIV) and Planar Light Induced Fluorescence (LIF) are used to measure local velocities and temperatures. Data measured in a symmetry plane parallel to a sidewall are presented in terms of mean velocities and temperature and in terms turbulent quantities including Reynolds fluxes. The flow consists a plume rising above the heated plate into an almost stagnant fluid with a weakly stratified temperature field, as well as thin buoyancy driven boundary layers down the sidewalls. The measured Reynolds fluxes show that the dominating heat transport is in the plume in vertical direction. This transport relates to hot parcels of fluid rising due to buoyancy. A considerable heat transport in horizontal direction from the plume to the surrounding, stagnant fluid maintains the stratified temperature field.
Original languageEnglish
Title of host publication11th Intl. Symposium on Applications of Laser Techniques to Fluid Mechanics : Book of abstracts
VolumeCD-rom, 35-1
Place of PublicationLisboa, Portugal
PublisherInstituto Superior Técnico
Publication date2002
Pages1-12
Publication statusPublished - 2002
Event11th International Symposium on Applications of Laser Techniques to Fluid Mechanics - Lisbon, Portugal
Duration: 8 Jul 200211 Jul 2002

Conference

Conference11th International Symposium on Applications of Laser Techniques to Fluid Mechanics
CountryPortugal
CityLisbon
Period08/07/200211/07/2002

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