Graduate Thesis Or Dissertation
 

Design, fabrication, and characterization of the laser-imaged natural circulation (LINC) facility

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3197xq380

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  • Currently there is a great amount of interest in the phenomena of natural circulation as a cooling mechanism for normal operation as well as emergency conditions in nuclear reactors and spent fuel pools. In order to better understand this phenomena for the specific geometry of vertical, heated rods in water, an experimental facility was designed and constructed at Oregon State University. This facility, named the Laser-Imaged Natural Circulation (LINC) facility, consists of a water tank capped with a custom cooling plate through which two heated rods pass into the tank. The LINC facility enables flow patterns in the channel between the heated rods to be imaged and quantified using particle image velocimetry (PIV). This paper presents the reasoning and theory behind the design of the LINC facility, as well as a characterization of the thermodynamics, boundary layer thickness and velocity profile progression of the system. The thermodynamic analysis consists of bulk equilibrium temperatures and heat removal rates for 3 cases where the two heater rods have equal power levels (dubbed "symmetrical heating"). The boundary layer thickness analysis consists of a test matrix of 5 test cases including symmetrical and asymmetrical heating in which the thickness of the boundary layer is measured using the velocity field between the heater rods. The velocity profile analysis centered on an effective vertical length of 100 mm along the entrance region between the two rods at one symmetrical rod power. In addition to these experiments, additional synthesis of data regarding the dependence of the Nusselt number on the Rayleigh number along with temperature profile of the boundary layer were collected and presented.
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