雪水二相流の合流損失に対する諸因子の影響

概要

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The power loss in pipe junctions was measured for a snow/water mixture under the condition of a constant Reynolds number referring to the joined condition. The results are summarized as follows. (1) When the power loss coefficient ζ_c is defined by taking the snow/water mixture as a homogeneous fluid, the relationship between ζ_c and the flow rate ratio Q_2/Q_3 is similar to that for pure water, and the configuration factors, the areal ratio m and the connecting angle θ, have the same effects on the ζ_c〜Q_2/Q_3 relation as on the flow of pure water. (2) When the snow volume fraction C is smaller than the critical value C', ζ_c is equal to that of pure water ζ_<cw>. When C >C', the presence of snow increases ζ_c, and this effect is more remarkable under a condition with a smaller ζ_<cw>, i.e., when θ is small and the velocity ratio U_2/U_1 is around unity. (3) An empirical formula is obtained to predict the additional power loss due to the mixing of snow in combining flow.
一般社団法人日本機械学会の論文
1987-09-25