Index Catalog // ScholarsArchive@OSU

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:: heat flux calculated for a testing case of 20 W cm-2 heat flux, 500 kg m-2 s-1 mass flux, and 1.1

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:: O f P e rf o rm a n c e ( -) 30 40 50 60 70 80 90 100 110 120 M e m b ra n e D

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:: 80 to 150 kg-m-2-s-1 in square microchannels (Dh = 840 μm) at quality ranging from 0.01 to 0.60. A

Investigation of In-tube Non-equilibrium Condensation of Low Global Warming Potential Refrigerants

Creator:: Jacob, Tabeel A.
Abstract:: This work investigates the in-tube condensation of low global warming potential (GWP) zeotropic refrigerant mixtures R448A, R450A, R452A, R454B and R454C. These refrigerants have been proposed for a wide range of commercial heating, ventilation, air-conditioning applications, but their heat and momentum transport phenomenon were not well understood. Thus, in this...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Tabeel A. Jacob for

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:: results for PR = 1.1, G = 500 kg m -2s-1, T in = 20oC and q ′′ = 20 W cm-2.(a) Fluid temperature profile

Characterization of flow boiling in a fractal–like branching microchannel network

Creator:: Edward, Lee M.
Abstract:: Based on experimental investigations the present study evaluates flow instability and void fraction in a fractal-like branching microchannel network with rectangular cross-section. The hydraulic diameter of the channels ranged from 308μm at the inlet to 143μm at the outlet. The flow network used is characterized by set branching ratios for...
Resource Type:: Masters Thesis
Full Text:: Characterization of Flow Boiling in a Fractal–Like Branching Microchannel Network by Lee M. Edward A

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:: Investigation of the Feasibility of a Process-Intensified Differential Temperature Water-Gas Shift Reactor with

Effect of Active Trailing Edge Motion Upon Airfoil Energy Harvester

Creator:: Strahl, Jordan D.
Abstract:: The application of a flapping foil with prescribed trailing edge motion to energy harvesting in a low reduced frequency (k = fc/U∞) regime was experimentally studied. The effects of the phase and amplitude of the applied trailing edge motion upon time-variant power extraction capability have been measured and are interpreted....
Resource Type:: Masters Thesis
Full Text:: 1.8 Hz. With a foil chord length of 0.15 m, the corresponding Reynolds number range is 27, 000 ≤ Rec

The Feasibility of Process Intensification of the Water-Gas Shift Reaction using Differential Temperature Microreactors

Creator:: Tolley, Thomas E.
Abstract:: Hydrogen is an increasingly attractive low-carbon energy carrier for a variety of stationary and mobile applications. Currently, the vast majority of hydrogen in the United States is produced via the energy intensive steam reforming of natural gas. The cost and carbon emissions associated with hydrogen production can be reduced by...
Resource Type:: Masters Thesis
Full Text:: differential temperature reactor CO conversion profiles for a catalyst thickness of 5× 10−4 m

Transient analysis of a tennis racket using PC-based finite elements and experimental techniques

Creator:: Jenkins, Christopher H. M.
Abstract:: Only very recently has modern technology been applied to the design of the tennis racket. In fact, the tennis player of a few hundred years ago would easily recognize today's racket. Although the literature reveals a surprising number of studies on racket mechanics, little work has been reported on the...
Resource Type:: Masters Thesis
Full Text:: of a Tennis Racket Using PC-based Finite Elements and Experimental Techniques by Christopher H. M

ScholarsArchive@OSU

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

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

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

Investigation of In-tube Non-equilibrium Condensation of Low Global Warming Potential Refrigerants

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

Characterization of flow boiling in a fractal–like branching microchannel network

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

Effect of Active Trailing Edge Motion Upon Airfoil Energy Harvester

The Feasibility of Process Intensification of the Water-Gas Shift Reaction using Differential Temperature Microreactors

Transient analysis of a tennis racket using PC-based finite elements and experimental techniques

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