Determine the Thickness of Boundary Layer in Free Convection on the Vertical Plate With Uniform Heat Flux

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ainali, Omid | 2009

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 39901 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Shafie, Behshad
Abstract:
Experiments were performed to explore the free convective hat transfer characteristics of water based nanofluids. Experiments of natural convection over a vertical flat plate with constant heat flux in water-based nanofluids with Ag and TiO2 nanoparticles were performed. Velocity boundary layer measured using PIV method. Also convective heat transfer coefficient obtained using three thermometers behind the wall. Various test cases with different heat fluxes on the wall are considered. Two volumetric concentrations of Ag nanofluid, 1% and 2%, and TiO2 nanofluid, 1% and 2%, were tested in the present study. It was shown that, with increasing nanofluid concentration, velocity boundary layer thickness, and temperature on the wall decreases. In the other word, nanoparticles enhance, convective heat transfer coefficient of the fluid
Keywords:
Boundary Layer ; Nanofluid ; Free Convection ; Particle Image Velocimetery (PIV)

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