Index Catalog // ScholarsArchive@OSU

A study of adiabatic and diabatic flow boiling in parallel microchannels and fractal-like branching microchannels

Creator:: Daniels, Brian J.
Abstract:: A one-dimensional numerical model has been developed to study diabatic and adiabatic flow boiling in microchannels. This model accounts for developing flow effects and variable property effects. The model uses correlations for void fraction and two-phase multipliers found in the literature. The model has been used to study the performance...
Resource Type:: Dissertation
Full Text:: presented on September 10, 2008. Title: A Study of Adiabatic and Diabatic Flow Boiling in Parallel

Development of Two-Color Laser Induced Fluorescence Fluid Temperature Imaging for Free Convection Heat Transfer Applications

Creator:: McAfee, Rachel C.
Abstract:: The development of a continuous and reliable cooling method for computer chips is an evolving subject requiring continuous research in both computer science and thermal management. Two-dye laser induced fluorescence (LIF) provides a minimally invasive way to investigate electronics cooling fluid behavior. Dielectric fluids are of particular interest as they...
Resource Type:: Honors College Thesis
Full Text:: was examined at heat fluxes ranging from 0.16 to 0.76 W/cm2 and ambient temperatures of 20-45°C. A

Leading Edge Separation Analysis of Oscillating Airfoil Energy Harvesters

Creator:: Ngo, Vickie
Abstract:: Oscillating foil energy harvesters are analyzed at optimal reduced frequencies (𝑘=𝑓𝑐/𝑈) to determine how the leading edge radius of curvature affects leading edge separation. The understanding of leading edge separation and its behaviors is critical to predicting the transient lift profile of an airfoil. The separation is therefore also critical...
Resource Type:: Masters Thesis
Full Text:: constructed with a chord length, c, of 150[mm]. All units in this table are in [mm

Effects of a thin, flexible nozzle on droplet formation and impingement

Creator:: Hawke, Shane R.
Abstract:: The droplet formation process in the vicinity of the nozzle exit and the behavior of a spreading droplet during impingement on a smooth glass surface were studied. Two nozzle geometries were tested. The first case was a stiff stainless steel nozzle plate 0.787 mm thick. The second case was a...
Resource Type:: Masters Thesis
Full Text:: SolidWorks drawing . . . . 96 C.1 Droplet formation for the stiff nozzle, waveform A (0 - 7.5 ms

Effect of PZT driving waveform and frequency on meniscus shape and dropon-demand droplet formation parameters

Creator:: Yang, Guozhong
Abstract:: For piezoelectric stack (PZT) driven droplet generator, the driving waveform and driving frequency effect on liquid filament shape and droplet characteristics have been experimentally studied. The experimental study was based on a PZT driven droplet generator with known geometric design parameters and working fluid properties. A lumped-element-model (LEM) constructed to...
Resource Type:: Dissertation
Full Text:: ) three-pulse waveform A; (b) three-pulse waveform B; (c) two- pulse waveform; (d) square waveform

Evaluation of the predictive capability of two-phase flow maps for microchannel condensation of R-134a at low mass flux conditions

Creator:: VanderPutten, Michael A.
Abstract:: Predicting condensation flow regimes and the associated heat transfer and pressure drop in microchannels is critical for designing terrestrial and space systems for heating, cooling, power generation, and advanced manufacturing. It is well established that in flows approaching the microscale (Dh < 1 mm) gravity-dominated flow regimes become less relevant,...
Resource Type:: Masters Thesis
Full Text:: a large temperature difference across the water-side (ΔT > 10°C). To mitigate maldistribution in

An investigation of the feasibility of a process-intensified differential temperature water-gas shift reactor with integrated Pt/Al2O3 catalyst

Creator:: Hu, Kathy Q.
Abstract:: There has been serious interest in hydrogen as a source of energy in the United States due to its capability of delivering a sustainable, carbon-free energy future. Currently, most hydrogen in the United States is produced via the steam methane reforming of natural gas, which converts methane to hydrogen through...
Resource Type:: Masters Thesis
Full Text:: steam-methane reformer is cooled to 350°C and enters a conventional two-stage water-gas shift reactor

Fluidized Bed Reactor Engines

Creator:: Lavrich, Zoe A.
Abstract:: Repurposing internal combustion engines as petrochemical reactors (i.e., Reactor engines) could offer a smaller, scalable alternative to traditional full scale chemical processing facilities. For many chemical processes, incorporating catalyst particles in fluidized beds is expected to result in superior performance over both monoliths and packed beds. Conversion of ethane into...
Resource Type:: Masters Thesis
Full Text:: (i.e., Reactor engines) could offer a smaller, scalable alternative to traditional full scale

Design of a single lamina for a microchannel dialyzer with a focus on bubble removal

Creator:: Mohammadi, Mahshid
Abstract:: A microchannel-based hemodialyzer offers a novel approach to hemodialysis practice and holds many promises for improving dialysis treatment efficiency and quality of life for kidney patients. The hollow fiber hemodialyzer, a conventional dialysis device, has certain limitations including non-uniformity of the dialysate flow path which necessitates the use of a...
Resource Type:: Dissertation
Full Text:: the motion, a and b are images of one bubble and c and d are images of another. a) concave back

Thermally actuated pumping of a single-phase fluid using surface asymmetry

Creator:: Jo, Myeong Chan
Abstract:: An experimental study of thermally actuated pumping of a single-phase, single-component fluid is presented in the context of thermal management of a heat source. The prominent feature of this pumping method is that the very heat that is to be removed from the heat source causes a net fluid motion....
Resource Type:: Masters Thesis
Full Text:: of the oil-air interfacial temperature for three liquid thicknesses: (a) 0.5 mm (b) 1.0 mm (c) 2.7

ScholarsArchive@OSU

A study of adiabatic and diabatic flow boiling in parallel microchannels and fractal-like branching microchannels

Development of Two-Color Laser Induced Fluorescence Fluid Temperature Imaging for Free Convection Heat Transfer Applications

Leading Edge Separation Analysis of Oscillating Airfoil Energy Harvesters

Effects of a thin, flexible nozzle on droplet formation and impingement

Effect of PZT driving waveform and frequency on meniscus shape and dropon-demand droplet formation parameters

Evaluation of the predictive capability of two-phase flow maps for microchannel condensation of R-134a at low mass flux conditions

An investigation of the feasibility of a process-intensified differential temperature water-gas shift reactor with integrated Pt/Al2O3 catalyst

Fluidized Bed Reactor Engines

Design of a single lamina for a microchannel dialyzer with a focus on bubble removal

Thermally actuated pumping of a single-phase fluid using surface asymmetry

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