同軸二重円筒間の自然対流場の準定常性とカオス性 : 熱工学 , 内燃機関 , 動力

概要

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In this study unsteady and chaotic characteristics of the thermal convection fields between concentric annuli were experimentally examined, and they were compared with the previously reported fields in a vertical slot. The inner cylinder was heated by a embedded heater and the outer one was cooled by temperature-controlled cold water, and the 84 wt% glycerol-water solution was used for the present test fluid. The main results are as follows : (1) The region where the characteristic frequency of temperature-variation is detected is located at the upper portion of the region where the secondary cells exist. (2) The time scale of the temperature change at which auto-correlation function becomes 1/e is relatively small in the secondary-cell region, and this corresponds to the result of the natural convection field in a vertical slot. (3) The significant chaotic characteristics in the temperature-variation are determined in almost the same region where the characteristic frequency of temperature-variation is detected, which is peculiar to the field of the present study.
一般社団法人日本機械学会の論文
2001-03-25