流動層中の水平加熱円管まわりの非定常局所伝熱特性

概要

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Attention should be paid to the unsteady chracteristics in a fluidized bed in order to clarify the fundamental mechanism of heat transfer in a gas fluidized bed heat exchanger. The unsteady local heat transfer characteristics around a single horizontal heated circular cylinder immersed in a fluidized bed were studied as a problem on a fluidized bed heat exchanger. Firstly, a new heat flux sensor was developed, which was tolerant to the abrasion due to particles in a fluidized bed. The static and frequency characteristics of the heat flux sensor were found to be appropriate. Secondly, instantaneous local heat transfer coefficients around a cylinder were measured by connecting the sensor to a constant temperature anemometer. The signals were analyzed to obtain time-averaged value, variance, probability density function, power spectrum, etc. The local behavior of particles near the cylinder was also observed. The dominant mechanism of heat transfer was discussed on the basis of those results.
社団法人日本機械学会の論文
1991-05-25