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- Creators: Spring, Robert
Description
Recent literature indicates potential benefits in microchannel cooling if an inlet orifice is used to suppress pressure oscillations that develop under two-phase conditions. This study investigates the costs and benefits of using an adjustable microchannel inlet orifice. The focus is on orifice effect during steady-state boiling and critical heat flux (CHF) in the channels using R134a in a pumped refrigerant loop (PRL). To change orifice size, a dam controlled with a micrometer was placed in front of 31 parallel microchannels. Each channel had a hydraulic diameter of 0.235 mm and a length of 1.33 cm. For steady state two-phase conditions, mass fluxes of 300 kg m-2 s-1 and 600 kg m-2 s-1were investigated. For orifice sizes with a hydraulic diameter to unrestricted hydraulic diameter (Dh:Dh,ur) ratio less than 35 percent, oscillations were reduced and wall temperatures fell up to 1.5 °C. Critical heat flux data were obtained for 7 orifice sizes with mass fluxes from 186 kg m-2 s-1 to 847 kg m-2 s-1. For all mass fluxes and inlet conditions tested, CHF values for a Dh:Dh,ur ratio of 1.8 percent became increasingly lower (up to 37 W cm-2 less) than those obtained with larger orifices. An optimum orifice size with Dh:Dh,ur of 35 percent emerged, offering up to 5 W cm-2 increase in CHF over unrestricted conditions at the highest mass flux tested, 847 kg m-2 s-1. These improvements in cooling ability with inlet orifices in place under both steady-state and impending CHF conditions are modest, leading to the conclusion that inlet orifices are only mildly effective at improving heat transfer coefficients. Stability of the PRL used for experimentation was also studied and improved. A vapor compression cycle's (VCC) proportional, integral, and derivative controller was found to adversely affect stability within the PRL and cause premature CHF. Replacing the VCC with an ice water heat sink maintained steady pumped loop system pressures and mass flow rates. The ice water heat sink was shown to have energy cost savings over the use of a directly coupled VCC for removing heat from the PRL.
ContributorsOdom, Brent A (Author) / Phelan, Patrick E (Thesis advisor) / Herrmann, Marcus (Committee member) / Trimble, Steve (Committee member) / Tasooji, Amaneh (Committee member) / Holcomb, Don (Committee member) / Arizona State University (Publisher)
Created2012
Description
This project includes a recording and performance guide for three newly commissioned pieces for the clarinet. The first piece, shimmer, was written by Grant Jahn and is for B-flat clarinet and electronics. The second piece, Paragon, is for B-flat clarinet and piano and was composed by Dr. Theresa Martin. The third and final piece, Duality in the Eye of a Bovine, was written by Kurt Mehlenbacher and is for B-flat clarinet, bass clarinet, and piano. In addition to the performance guide, this document also includes background information and program notes for the compositions, as well as composer biographical information, a list of other works featuring the clarinet by each composer, and transcripts of composer and performer interviews. This document is accompanied by a recording of the three pieces.
ContributorsPoupard, Caitlin Marie (Author) / Spring, Robert (Thesis advisor) / Gardner, Joshua (Thesis advisor) / Hill, Gary (Committee member) / Oldani, Robert (Committee member) / Schuring, Martin (Committee member) / Arizona State University (Publisher)
Created2016
Description
In the fast-paced, technology-driven society of today, new demands are placed on artists to re-think how music is presented and communicated to the world. Access to the internet, development of sound manipulation software, and broader means of use and distribution through the digital music industry have drastically shifted the way the twenty-first century artist creates and performs music. One of the most striking changes that occurred is the increased use of visual material as a vehicle to enhance and contribute to the depth and intrigue of live performances and recordings.
This project researches twenty-first century works for clarinet and multimedia that specifically include a visual element (including but not limited to images, fixed and interactive video, light effects, and choreography) and highlights the prevalence of this genre in contemporary repertoire. Discussion begins with a brief overview of the history of multimedia, its relation to the clarinet, and how it has been defined by the twenty-first century. Additionally, in order to contribute to this ever-growing repertoire, three new works for clarinet and multimedia were commissioned in collaboration with composers and visual artists. These new works include: Roadrunner (2019) for clarinet and fixed electronics by Spencer Brand with video by Samuel Proctor; I’d known this place (2020) for clarinet and electronics by Dan Caputo with live audio generative animations by Andrew Robinson; and Spectral Passages (2020) for clarinet and electronics by Alvaro Varas with painting by Miguel Godoy. Background information and performance guides are included for each piece to aid future musicians in performance, as well as respective audio/video recordings. Finally, a significant portion of this document includes a catalog of works for clarinet and multimedia. The catalog was compiled by focusing on the output of twenty-first century composers to serve as a resource for future performers.
This project researches twenty-first century works for clarinet and multimedia that specifically include a visual element (including but not limited to images, fixed and interactive video, light effects, and choreography) and highlights the prevalence of this genre in contemporary repertoire. Discussion begins with a brief overview of the history of multimedia, its relation to the clarinet, and how it has been defined by the twenty-first century. Additionally, in order to contribute to this ever-growing repertoire, three new works for clarinet and multimedia were commissioned in collaboration with composers and visual artists. These new works include: Roadrunner (2019) for clarinet and fixed electronics by Spencer Brand with video by Samuel Proctor; I’d known this place (2020) for clarinet and electronics by Dan Caputo with live audio generative animations by Andrew Robinson; and Spectral Passages (2020) for clarinet and electronics by Alvaro Varas with painting by Miguel Godoy. Background information and performance guides are included for each piece to aid future musicians in performance, as well as respective audio/video recordings. Finally, a significant portion of this document includes a catalog of works for clarinet and multimedia. The catalog was compiled by focusing on the output of twenty-first century composers to serve as a resource for future performers.
ContributorsClements, Katrina Isabel (Author) / Spring, Robert (Thesis advisor) / Gardner, Joshua (Thesis advisor) / Meyer, Jeffery (Committee member) / Micklich, Albie (Committee member) / Rockmaker, Jody (Committee member) / Arizona State University (Publisher)
Created2020