Graduate Thesis Or Dissertation
 

An experimental and analytical analysis of a heated thermocouple flow device

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/xg94hs44s

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  • The topic of this thesis is to discuss an investigation made for a fluid velocity measuring device. The OSU thermal hydraulic testing facility is interested in using a small probe to measure fluid velocities in the annular region of a model nuclear reactor vessel. A heater with a thermocouple embedded into the center of the heated region was considered for this application. The philosophy of using such a device is as follows. The temperature of the heater would be monitored closely. Power fed to the heater would be modulated to keep the temperature of the heater constant. The flow of water passing across the heater would draw more or less heat from the heater. The power used can then be related directly to the velocity of the water. Data for this type of experiment was taken in the summer of 1992. A mathematical model to describe the velocity probe behavior was developed to examine this type of application in different situations. The data was used to test the adequacy of the model. Analysis of the experimental data show this system is good for measuring steady state systems but is sluggish during large changes in system flow velocity. Results from the numerical model showed that it is has good results predicting steady state data but exhibits difficulty in reproducing hysteresis effects.
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  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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