Graduate Thesis Or Dissertation
 

A study of forces on simulated heat exchange tubes immersed in a cold fluidized bed

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hd76s2938

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  • The object of this research, project was to study how different parameters effect the magnitude and frequency composition of forces exerted on simulated heat exchange tubes immersed in a cold fluidized bed. Two arrays of tubes were assembled with the tubes mounted in an equilateral triangular pitch pattern. The center column of tubes in each array was instrumented with bi-directional strain gage load cells. The parameters varied and studied during this experimental research were the superficial air velocity, the spacing between centers of the tubes, the distance between the distributor plate and the bottom tube, and the mean particle diameter. A digital force-time series of the force exerted on each of the instrumented tubes was obtained in both the vertical and horizontal planes. Results are given in the form of a plot of the force-time history and a statistical analysis for both the tube in the array experiencing the most severe loading and the simultaneous sum of the loads experienced by all of the instrumented tubes. The statistical analysis includes the mean and variance of the digital force-time series and a plot of power spectral density verses frequency. Also shown are plots indicating how the statistical results vary with changes in superficial air velocity while holding all other parameters constant. The severity of loads on single tubes as well as the sum of the loads on all of the instrumented tubes varied with changes in the tube spacing, the height of the tubes above the distributor plate, and the air velocity. Peak vertical loads exceeded 140 lbs on individual tubes and 200 lbs on a complete column of instrumented tubes, while the horizontal loads were always less than half as severe as the vertical loads.
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  • File scanned at 300 ppi (Monochrome, 24-bit Color) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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