Graduate Thesis Or Dissertation
 

Two-Color Laser Induced Fluorescence Imaging of Fluid Temperature for Free Convection and Vapor Condensation

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/vh53x3844

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  • The development of a continuous and reliable cooling method for computer chips is an evolving subject requiring continuous research in both computer science and thermal management. Two-color laser induced fluorescence (LIF) provides a non-invasive way to investigate electronics cooling fluid behavior. Dielectric fluids are of particular interest as they allow for full contact with the electronics and have low boiling points, opening the door to two-phase cooling applications. The primary motivation of this research is the exploration of fluid phenomena with the goal of establishing two-color laser induced fluorescence as a viable experimental technique for a wider array of fluid-based heat transfer applications. A two-color LIF technique with an Nd:YAG laser was used in order to implement an in situ calibration standard for natural convection temperature measurements and is examined at heat fluxes ranging from 0.16 to 0.76 W/cm2. Sulforhodamine 101 and Rhodamine B fluorescent dyes are used, and concentrations are reported. The validated LIF technique is carried over to the temperature profile of a rising superheated vapor bubble. Dielectric fluid is pressurized in a commercial pressure chamber and injected at 58 °C via a vertically oriented inlet valve at the base of a dielectric chamber. The two-dye LIF technique with an Nd:Yag laser is used to implement a calibration standard and develop a vertically sliced temperature profile around the injected vapor bubble. From this a repeatable and unobtrusive method for measuring temperature profiles for both single and two-phase fluids is established.
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