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Full-Text Articles in Mechanical Engineering
Simultaneous Planar Laser-Induced Incandescence, Oh Planar Laser-Induced Fluorescence, And Droplet Mie Scattering In Swirl-Stabilized Spray Flames, Terrence Meyer, Sukesh Roy, Vincent Belovich, Edwin Corporan, James Gord
Simultaneous Planar Laser-Induced Incandescence, Oh Planar Laser-Induced Fluorescence, And Droplet Mie Scattering In Swirl-Stabilized Spray Flames, Terrence Meyer, Sukesh Roy, Vincent Belovich, Edwin Corporan, James Gord
Terrence R Meyer
Simultaneous planar laser-induced incandescence, hydroxyl radical planar laser-induced fluorescence, and droplet Mie scattering are used to study the instantaneous flame structure and soot formation process in an atmospheric pressure, swirl-stabilized, liquid-fueled, model gas-turbine combustor. Optimal excitation and detection schemes to maximize single-shot signals and avoid interferences from soot-laden flame emission are discussed. The data indicate that rich pockets of premixed fuel and air along the interface between the spray flame and the recirculation zone serve as primary sites for soot inception. Intermittent large-scale structures and local equivalence ratio are also found to play an important role in soot formation.
Experimental Verification Of Near-Wall Hindered Diffusion Theory For The Brownian Motion Of Nanoparticles Using Evanescent Wave Microscopy, Kenneth D. Kihm, Arindam Banerjee
Experimental Verification Of Near-Wall Hindered Diffusion Theory For The Brownian Motion Of Nanoparticles Using Evanescent Wave Microscopy, Kenneth D. Kihm, Arindam Banerjee
Mechanical and Aerospace Engineering Faculty Research & Creative Works
A total internal reflection fluorescence microscopy technique coupled with three-dimensional tracking of nanoparticles is used to experimentally verify the theory on near-wall hindered Brownian motion [Goldman et al., Chem. Eng. Sci. 22, 637 (1967); Brenner, Chem. Eng. Sci. 16, 242 (1967)] very close to the solid surface (within ~1 µm). The measured mean square displacements (MSDs) in the lateral x-y directions show good agreement with the theory for all tested nanoparticles of radii 50, 100, 250, and 500 nm. However, the measured MSDs in the z direction deviate substantially from the theory particularly for the case of smaller particles of …
Laser Induced Fluorescence Photobleaching Anemometer For Microfluidic Devices, Guiren Wang
Laser Induced Fluorescence Photobleaching Anemometer For Microfluidic Devices, Guiren Wang
Faculty Publications
We have developed a novel, non-intrusive fluid velocity measurement method based on photobleaching of a fluorescent dye for microfluidic devices. The residence time of thefluorescent dye in a laser beam depends on the flow velocity and approximately corresponds to the decaying time of the photobleaching of the dye in the laser beam. The residence time is inversely proportional to the flow velocity. The fluorescence intensity increases with the flow velocity due to the decrease of the residence time. A calibration curve between fluorescence intensity and known flow velocity should be obtained first. The calibration relationship is then used to calculate …