A study of bubble size in a large particle fluidized bed at elevated temperatures Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/8049g770g

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  • The literature cites several examples of investigations made concerning the size of bubbles rising in small particle fluidized beds at room temperature. In many practical applications, however, fluidized beds require the use of large particles at very high temperatures. Despite this fact, little information has been reported on bubble size involving parameters of this nature. The object of this research was to develop a correlating equation, based on experimental data, which relates the significant parameters influencing bubble growth to the bubble diameter in large particle beds at high temperature. Experiments were conducted in a rectangular, three dimensional fluidized bed. A stainless steel gas distributor plate was used. Tests were run for different values of excess gas velocity, static bed height and bed temperature for a single particle size of 2230 pm. Static bed height varied from 0.254 m to 0.483 m and bed temperature was changed from 700 K to 1030 K. High speed cinematography was used to film the surface of the bed while fluidized for those varied conditions. The diameters of the erupting bubble, which showed on the film were then measured. Computer techniques involving a Quasi-Newton method were employed to obtain the equation which best approximated the data. An experimental uncertainty of ten percent was associated with the data and the correlating equation reproduced the data under equivalent conditions within six percent for the worst case. In an effort to establish the relavence of the equation to other research, it's predicted values of bubble diameter were compared to the only other known data available at similar conditions. The equation predicted much higher bubble diameters than the results presented by the other researchers. The only significant parameter different between the two studies was the particle size. With that information, a nondimensional form of the equation was sought which related excess gas velocity, static bed height, bed temperature and particle size to bubble diameter. Such a form was established. A comparison with the other available data showed a substantial improvement in curve fit over the comparison which omitted particle size as a significant parameter. The experiemental uncertainty for the nondimensional form of the equation was found to be about eight percent, while the nondimensional form reproduced the data available as a results of other research within thirteen percent for the worst case.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-09-05T21:44:51Z (GMT) No. of bitstreams: 1 HockmanJeffreyNathan1981.pdf: 762510 bytes, checksum: 63d37714952c71146638e18745916552 (MD5)
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