Index Catalog // ScholarsArchive@OSU

Study of a constrained-film bubble absorber under cycle operating conditions

Creator:: Cardenas, Ruander
Abstract:: An experimental and numerical study of absorption of ammonia vapor bubbles into a constrained thin film of ammonia-water solution is presented in the context of a potential reduction in size of a heat-actuated heat pump component. A large-aspect-ratio channel with a depth of 600 µm restricts the thickness of the...
Resource Type:: Masters Thesis

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

Preparation of semiconductor nanoparticle solutions using microreaction technology

Creator:: Kroon, Joan M.
Abstract:: Nanoparticles, materials on a 10⁻⁹ meter size scale, are finding applications in a variety of areas including catalysts, fuel and solar cells, biological labeling. electronics and optoelectronic devices. Semiconductor nanoparticles are of particular interest because of their size tunable properties resulting from quantum confinement effects. Mass productions of monodisperse semiconductor...
Resource Type:: Masters Thesis

Modeling convective boiling flow with in-situ local vapor extraction

Creator:: Salakij, Saran
Abstract:: The pressure drop of convective boiling flow may be reduced by extracting vapor locally since the entire generated vapor does not have to travel through the entire channel length. In this study, the theoretical model was developed to simulate a convective boiling flow through a fractal-like branching microchannel network with...
Resource Type:: Masters Thesis

Microscale thermal management utilizing vapor extraction from a fractal-like branching heat sink

Creator:: Apreotesi, Mario A.
Abstract:: It is hypothesized that increases in pressure drop due to vapor generation during boiling in microchannels can be reduced by extraction of vapor at its point of inception. Ultimately, this local vapor extraction decreases the pressure drop required to drive the flow through a fractal-like branching, microchannel flow network within...
Resource Type:: Masters Thesis

Microlamination based on surface mount technology for the economical production of microchannel arrays

Creator:: Sharma, Nitin
Abstract:: Micro Energy and Chemical Systems (MIECS) are multi-scale microsystems, which rely on embedded nano and micro-scale features to process bulk amounts of fluid in applications ranging from man-portable heat pumps, distributed fuel reforming and insitu waste remediation. Microlamination is a well-known process architecture for fabricating the highly parallel, high aspect...
Resource Type:: Masters Thesis

Micro-bubble dynamics in two-phase flow through a micro-channel

Creator:: Shepard, Thomas G.
Abstract:: An experimental investigation into the behavior of micro-bubbles flowing through a micro-channel has been conducted. Experiments were performed within a rectangular micro-channel with dimensions of 5 cm x 13.2 mm x l30 jim. Bubbles were generated in an electrolyte solution by electrolysis at the lower channel wall near the inlet....
Resource Type:: Masters Thesis

Laminate mixing in microscale fractal-like merging channel networks

Creator:: Enfield, Kent E.
Abstract:: A two-dimensional model was developed to predict concentration profiles from passive, laminar mixing of concentration layers formed in a fractal-like merging channel network. Both flat and parabolic velocity profiles were used in the model. A physical experiment was used to confirm the results of the model. Concentration profiles were acquired...
Resource Type:: Masters Thesis

Flow induced mixing in high aspect ratio microchannels

Creator:: Siripoorikan, Bunchong
Abstract:: Micro-fluid mixing is an important aspect of many of the various micro-fluidic systems used in biochemical production, biomedical industries, micro-energy systems and some electronic devices. Typically, because of size constraints and laminar flow conditions, different fluids may only have the opportunity to mix by diffusion, which is extremely rate limited....
Resource Type:: Masters Thesis

Flow boiling of lithium bromide-water solution in microchannels, with application to desorption

Creator:: Fackrell, Kurt
Abstract:: Recent studies of flow boiling within microchannels have shown high heat fluxes, leading to successful design and testing of compact heat exchangers, cooling systems for electronics and other high efficiency, miniature components. An experimental study of flow boiling of a concentrated salt solution in microchannels is presented. Experiments examined flow...
Resource Type:: Masters Thesis

Fabrication and characterization of nanostructured surfaces for enhanced heat transfer

Creator:: Choi, Changho
Abstract:: This objective of this study is to investigate the capability of nanostructured surfaces on dissipating heat flux by performing pool boiling and convective flow boiling. The generation of ultra-high heat flux from high performance electric devices has motivated a number of investigations related to advanced heat transfer especially in two-phase...
Resource Type:: Masters Thesis

Diffusion bonding of large substrate MECS devices based on differential thermal expansion

Creator:: Chintapalli, Prashanth
Abstract:: Diffusion bonding has been widely used within microlamination architectures for the fabrication of Micro Energy and Chemical Systems (MECS). MECS are microsystems with the ability to process bulk amounts of fluid within highly-parallel microchannel arrays capable of accelerated heat and mass transfer. Thus far, diffusion bonding of microchannel arrays is...
Resource Type:: Masters Thesis

Development of a microchannel device for adsorption cooling application

Creator:: Asumpinpong, Kasidid
Abstract:: Single-layer and three-layer microchannel adsorption devices were fabricated by procedure that was newly developed. Aluminum was chosen for metal housing while the adsorption pair was silica gel and water. Each adsorption layer contained two layers of 250 μm-thick silica gel. Both silica gel layers opened to the same layer of...
Resource Type:: Masters Thesis

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

Application of infrared thermography for temperature measurement in microscale internal and external flows

Creator:: Patil, Vishal
Abstract:: Infrared (IR) thermography is applied to estimate heat transfer rates in external and internal microscale convective flows. The technique and analysis are developed in the context of external jet impingement flow and internal single-phase liquid flows. A heated-thin-foil thermography technique is applied to perform surface temperature visualization on a submerged...
Resource Type:: Masters Thesis

Application of controlled thermal expansion in diffusion bonding for the high-volume microlamination of MECS devices

Creator:: Pluess, Christoph
Abstract:: Diffusion bonding has been widely used within microlamination architectures for the fabrication of Micro Energy and Chemical Systems (MECS). MECS are microsystems with the ability to process bulk amounts of fluid within highly-parallel microchannel arrays capable of accelerated heat and mass transfer. Thus far, diffusion bonding of the microchannel arrays...
Resource Type:: Masters Thesis

An experimental study of co-flow ammonia-water desorption in an oil-heated, microscale, fractal-like branching heat exchanger

Creator:: Mouchka, Gregory A.
Abstract:: An experimental study was performed in which an ammonia-water solution was desorbed within a branching fractal-like microchannel array. The solution entered in the center of a disk, and flowed out radially until discharging in to a gravity-driven separation chamber. Heat was added to the ammonia-water through a thin wall, above...
Resource Type:: Masters Thesis

A technique for spatially resolved wall temperature measurements in microchannel heat sinks using infrared thermography

Creator:: Krebs, Daniel P.
Abstract:: A non-intrusive measurement technique for direct quantitative thermal visualization of channel wall temperatures in two phase microchannel flows using infrared thermography (IRT) is presented. Specifically, the measurement of top channel wall temperatures in a fractal-like branching microchannel silicon heat sink during flow boiling is demonstrated and thoroughly documented. Obtaining quantitative...
Resource Type:: Masters Thesis

A study of high shear multiphase flow in a microchannel

Creator:: Morse, Daniel R.
Abstract:: Microscale fluid processes are an increasingly important subgroup of fluid mechanics. Applications for heat transfer and micro-electro-mechanical devices use flows on the scale of less than one hundred microns. This study is part of a larger work in which a multiphase, high shear environment is studied in a microchannel that...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Study of a constrained-film bubble absorber under cycle operating conditions

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

Preparation of semiconductor nanoparticle solutions using microreaction technology

Modeling convective boiling flow with in-situ local vapor extraction

Microscale thermal management utilizing vapor extraction from a fractal-like branching heat sink

Microlamination based on surface mount technology for the economical production of microchannel arrays

Micro-bubble dynamics in two-phase flow through a micro-channel

Laminate mixing in microscale fractal-like merging channel networks

Flow induced mixing in high aspect ratio microchannels

Flow boiling of lithium bromide-water solution in microchannels, with application to desorption

Fabrication and characterization of nanostructured surfaces for enhanced heat transfer

Diffusion bonding of large substrate MECS devices based on differential thermal expansion

Development of a microchannel device for adsorption cooling application

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

Application of infrared thermography for temperature measurement in microscale internal and external flows

Application of controlled thermal expansion in diffusion bonding for the high-volume microlamination of MECS devices

An experimental study of co-flow ammonia-water desorption in an oil-heated, microscale, fractal-like branching heat exchanger

A technique for spatially resolved wall temperature measurements in microchannel heat sinks using infrared thermography

A study of high shear multiphase flow in a microchannel

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