自然対流を伴う水平円管内の脈動流れ(流体工学, 流体機械)

概要

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Investigations into the flow pattern and heat transfer in pulsating pipe flows have been reported by a number of authors. However, there are few studies of the case in which free convection is produced by buoyancy forces. It was shown in a previous paper (1995) that free convection in pulsating laminar flow occurs when the temperature differences between air in a room and water in an unheated pipe are large. Under such experimental conditions, cross-sectional distributions of axial velocities were obtained for water by means of a hot-wire anemometer. There have been very few investigations into theoretical analysis of pulsating laminar flows with free convection in horizontal tubes. In this case, the theoretical method reported by Mochizuki and Hatta (1973) is applicable only to relatively low values of the parameter ReRa (Re : Reynolds number, Ra : Rayleigh number). Therefore, this numerical analysis which is applicable to a high ReRa regime is presented. The influences of frequency on velocity and temperature distributions are examined, and the calculated results are qualitatively compared with the experimental data reported by authors previously.
一般社団法人日本機械学会の論文
1997-08-25