Index Catalog // ScholarsArchive@OSU

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

Turbulent Heat Transfer of Supercritical Carbon Dioxide in the Proximity of the Pseudo-Critical Point with Non-Uniform Heat Flux Boundary Conditions

Creator:: Jajja, Saad A.
Abstract:: Seven decades of supercritical heat transfer research have not seen an attempt to characterize turbulent thermal transport in internal flows subject to asymmetric heating. Existing heat transfer models therefore do not account for phenomena that dictates thermal transport, in the proximity of the pseudo-critical point, for non-uniform heating. Additionally, past...
Resource Type:: Dissertation
Full Text:: , Salman Nomenclature Symbols A Area m2 Cp Specific heat capacity J kg -1K-1 C̄p Integrated specific

Enabling Feasibility Assessment of Solar Thermal Energy Systems for Industrial Process Heating Applications

Creator:: Karki, Saroj
Abstract:: Existing studies on industrial heat demand have shown that more than 50% of the industrial process heat demand is in the range of low (<60 °C), medium (60-150 °C), and medium-high (<250 °C) temperatures. Most of the manufacturing industries across the world depend on combustion of carbon-based fossil fuels, either...
Resource Type:: Masters Thesis

Numerical and Experimental Evaluation of Membrane Based Energy Recovery Ventilator Performance with an Internal Support Structure

Creator:: Armatis, Paul D.
Abstract:: Large amounts of energy are wasted when conditioned air in buildings is exhausted to meet ventilation requirements. There are several technologies to recover some of this energy, including the recent development of membrane based energy recovery ventilators (ERVs). ERVs exchange sensible heat and moisture between incoming fresh and outgoing exhaust...
Resource Type:: Masters Thesis
Full Text:: ..................................................................... 69 NOMENCLATURE A m2 area AR - aspect ratio C mol m-3 concentration cp J kg -1K

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
Full Text:: Specific enthalpy (J kg-1) Km Minor loss coefficient ṁ Mass flow rate (kg s-1) MD Maldistribution

Part-Load Optimization of an Organic Rankine Cycle

Creator:: Ramsey, Owen
Abstract:: Waste-heat-recovery Organic Rankine Cycle (ORC) systems use excess heat from industrial processes to produce electrical power. In many cases, the temperatures and mass flow rates of these excess-heat streams vary significantly over time, causing the ORC to often operate far from its design point. In this study, a control strategy...
Resource Type:: Honors College Thesis
Full Text:: ............................................................................................................... 36 Nomenclature 𝐴 area [m2] 𝑐𝑃 specific heat capacity at constant pressure [J/kg-K] 𝐶

Experimental Investigation of Near-Critical Carbon Dioxide in Microchannels for High Flux Cooling Applications

Creator:: Travers, Kristen
Abstract:: With the continued decrease in size and subsequent increase in power of computer processors, thermal management in electronics is becoming more important than ever before. The chip heat densities are reaching new peaks (> 100 W cm-2) that current cooling methods are not able to keep up with. However, some...
Resource Type:: Honors College Thesis

Experimental investigation of supercritical heat transfer of carbon dioxide in parallel square microchannels with a single-wall constant heat flux boundary condition

Creator:: Zada, Kyle R.
Abstract:: In the vicinity of the pseudocritical point, supercritical carbon dioxide (sCO₂) undergoes a steep change in properties from “liquid-like” to “gas-like” as it is heated at a constant pressure. At the same time, there is a large spike in specific heat which can yield high heat transfer coefficients and heat...
Resource Type:: Masters Thesis
Full Text:: acceleration parameter (Jackson 2013) CI - Confidence interval Cp J kg-1 K-1 Specific heat capacity pC J

Condensation of a zeotropic mixture, R-454C, and its individual components, R-1234yf and R-32, in microfin tubes

Creator:: Matty, Ethan P.
Abstract:: This work compares the condensation heat transfer and pressure drop for zeotropic refrigerant R-454C and its individual components, R-32 and R-1234yf, in horizontal microfin tubes. One microfin tube has a 4 mm outer diameter, 0.18 mm wall thickness, and a surface area ratio of 1.56. The second tube has a...
Resource Type:: Masters Thesis

Investigation of Seasonal Performance of a Membrane Heat Pump System in Different Climate Regions

Creator:: Bukshaisha, Ahmad A.
Abstract:: Membrane based heat pumps systems have attracted the attention of many research groups as a potentially more environmentally friendly alternative to vapor compression systems that are being used for space cooling in 90\% of the buildings in the United States. Several prototypes systems have been developed, with reported claims of...
Resource Type:: Masters Thesis
Full Text:: conducted using the the Engineering Equation Solver (EES) (Klein, 2017) platform. 3.1 Approach The

ScholarsArchive@OSU

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

Turbulent Heat Transfer of Supercritical Carbon Dioxide in the Proximity of the Pseudo-Critical Point with Non-Uniform Heat Flux Boundary Conditions

Enabling Feasibility Assessment of Solar Thermal Energy Systems for Industrial Process Heating Applications

Numerical and Experimental Evaluation of Membrane Based Energy Recovery Ventilator Performance with an Internal Support Structure

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

Part-Load Optimization of an Organic Rankine Cycle

Experimental Investigation of Near-Critical Carbon Dioxide in Microchannels for High Flux Cooling Applications

Experimental investigation of supercritical heat transfer of carbon dioxide in parallel square microchannels with a single-wall constant heat flux boundary condition

Condensation of a zeotropic mixture, R-454C, and its individual components, R-1234yf and R-32, in microfin tubes

Investigation of Seasonal Performance of a Membrane Heat Pump System in Different Climate Regions

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