大口径配管における蒸気空気共存流れの下で生じる温度成層の抑制(成層(2),一般講演)

概要

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In warming up of a large bore steam pipe from a cold condition by using heating steam, remarkable temperature differences between tops and bottoms of the pipe were observed which seldom occur in small pipe. It is assumed that a difference of densities between the heating steam and stagnant cold air in the pipe and a degree of admission steam velocity are cause of the occurrence. It is of vital importance that the pipe remains uniformly heated to avoid uneven warming and resultant unanticipated behavior of thermal expansion in the piping system. CFD analysis is carried out and criteria for the appropriate warming-up methods are proposed using non dimensional numbers of Pe and Ri.
日本流体力学会の論文
2008-09-04