蓄熱・ヒートポンプ・熱輸送　　沈降天秤法による粒度分布測定におけるデータ処理

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  • Thermal Energy Storage, Heat Pump and Thermal Energy Transportation Technologies. Data Reduction in Measurement of Size Distribution using Sedimentation Balance Method.
  • チンコウ テンビンホウ ニ ヨル リュウド ブンプ ソクテイ ニ オケル デー

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Twomey's non-linear iteration method is applied to retrieve a particle size distribution from the sedimentation curve measured with a sedimentation balance method. The optimum power, p of weighting function and capability of shortening the measurement time are investigated numerically based on the log-normal and bimodal distributions. It is found that the appropriate value of power, p is 0.72 in most cases. Furthermore it is clarified that the non-linear iteration method can predict size distributions to a certain extent in the case of shortening a measurement time. In order to predict the log-normal distribution accurately, a measurement time longer than the settling time of the mass median diameter of tested powder is required.<BR>Based on these results, the size distributions were measured by a sedimentation balance for fly ash and glass beads. As a result, we can predict size distributions of these powders accurately after less than 30 minutes measurement.

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