Index Catalog // ScholarsArchive@OSU

Proportional integral derivative control of an oil-heated fractal-like branching microchannel desorber

Creator:: Davis, Keith R.
Abstract:: A PID controller was designed to control the performance of an oil-heated fractal-like branching microchannel desorber for use in an ammonia-absorption refrigeration system. Both the amount and concentration of ammonia refrigerant generated at the desorber can be controlled by choosing the rectified circulation ratio as the controlled variable in a...
Resource Type:: Masters Thesis
Full Text:: Abstract approved: ____________________________________________________________________ John Schmitt

Microchannel steam-methane reforming under constant and variable surface temperature distributions

Creator:: Eilers, Benn J.
Abstract:: Steam-methane reforming is a well understood industrial process used for generating hydrogen and synthesis gas. The reaction is generally carried out with residence times on the order of one second. By performing this reaction at microscales it is possible to take advantage of increased heat transfer rates and low diffusion...
Resource Type:: Masters Thesis
Full Text:: . Dr. John Simonsen for allowing the use of his rotary evaporator. Patrick Burns for providing his

Uniform residence time in microreactor-assisted solution deposition of CdS thin-films for CIGS photovoltaic cells

Creator:: Hires, Clayton Lamar
Abstract:: Photovoltaic (PV) cells have long been an attractive alternative for the consumption of fossil fuels but current manufacturing practices suffer from poor energy efficiency, large carbon footprints, low material utilization, high processing temperatures and high solvent usage. A critical step in PV production is the deposition of CdS as a...
Resource Type:: Masters Thesis
Full Text:: Warnes, Dr. Karl Haapala, and Dr. John Parmigiani for their recommendations, advice and support

Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network

Creator:: Kwak, Younghoon
Abstract:: Two-phase gas-liquid flows in microscale fractal-like branching channel flow networks were experimentally studied to assess the validity of existing void fraction correlations and flow regimes based on superficial gas and liquid velocities. Void fractions were assessed using two different methods. First, void fraction data were acquired using a High-Speed-High-Resolution (HSHR)...
Resource Type:: Dissertation

Characterization of the near-field flow structure of an acoustically self-excited jet in a large enclosure using particle image velocimetry (PIV)

Creator:: Tobias, Jason A.
Abstract:: An experimental study of the near-field flow structure produced by an incompressible turbulent Acoustically Self-Excited Jet (ASEJ) in a large enclosure using Particle Image Velocimetry (PIV) is presented. The salient feature of this jet is that it provides an increase in near-field mixing and turbulence without additional external power input....
Resource Type:: Masters Thesis

Development and validation of acoustic measurement techniques for void fraction in concentric annular geometries

Creator:: Tost, Brian C.
Abstract:: This work investigates the acoustic velocity of gas-liquid mixtures in vertical, co-current flow in a concentric annulus. Acoustic velocity shows promise as a detection parameter for the presence and amount of gas in a liquid flow because of its high sensitivity to gas void fraction in a gas-liquid mixture. However,...
Resource Type:: Dissertation

Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide

Creator:: Hyder, Matthew B. and Fronk, Brian M.
Abstract:: Concentrated solar power (CSP) plants have the potential to provide 24 h, renewable electricity. Current CSP systems have high capital and operational costs which makes the levelized cost of electricity uncompetitive with conventional techniques. Recent experimental research has shown the potential of small unit cells (up to 2 × 2 cm) containing micropin arrays...
Resource Type:: Article
Full Text:: McClintock (1953) method. The uncertainty analysis was performed for the model inputs in Table 2 and

Numbering-up of parallel microchannel arrays to megawatt scale supercritical CO₂ solar thermal receivers

Creator:: Hyder, Matthew B.
Abstract:: Concentrated solar power (CSP) plants have the potential to reduce the reliance on nonrenewable energies such as coal and natural gas and provide 24 hour, renewable electricity. A CSP system consists of a large field of heliostats that concentrate the sunlight on a centralized receiver, in this receiver a working...
Resource Type:: Masters Thesis

Thermal and Aerodynamic Effects of Surface Roughness Patterns on Additive Manufactured Heat Sinks

Creator:: Lundeen, Samuel L.
Abstract:: Breakthroughs in heat sink design are now limited by conventional manufacturing techniques which can only produce basic fin shapes with homogenous surface structuring. Additive Manufacturing (AM) is a potential disruptive technology for heat sink design and other convective heat transfer solutions, as surface properties can be directionally varied to maximize...
Resource Type:: Masters Thesis
Full Text:: Figure A.1 Kline & McClintock Uncertainty Tree ............................................. 101

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:: ................................................................. 55 Figure 4.9 - Sample EES results from Kline-McClintock uncertainty analysis

ScholarsArchive@OSU

Proportional integral derivative control of an oil-heated fractal-like branching microchannel desorber

Microchannel steam-methane reforming under constant and variable surface temperature distributions

Uniform residence time in microreactor-assisted solution deposition of CdS thin-films for CIGS photovoltaic cells

Experimental study of two-phase gas-liquid flow in a microscale fractal-like branching flow network

Characterization of the near-field flow structure of an acoustically self-excited jet in a large enclosure using particle image velocimetry (PIV)

Development and validation of acoustic measurement techniques for void fraction in concentric annular geometries

Simulation of thermal hydraulic performance of multiple parallel micropin arrays for concentrating solar thermal applications with supercritical carbon dioxide

Numbering-up of parallel microchannel arrays to megawatt scale supercritical CO₂ solar thermal receivers

Thermal and Aerodynamic Effects of Surface Roughness Patterns on Additive Manufactured Heat Sinks

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

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