90゜ベンド内層流の凝固閉そく限界 : 曲円管流の無次元整理に関連して

概要

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Experiments on solidification blockage of 90° bend laminar flow were made with two R/a ratio double cylinders. The inner pipe of the cylinder was supplied a developed laminar water flow, and through the outer pipe flowed a low temparature coolant supplied from a reservoir. With the ordinary dimensionless axial coordinate for the straight pipe, two critical curves for blokage were obtained according to the R/a ratios. Available calculated and experimental results were used to see a proper dimensionless axial coordinate which could compactly represent curved pipe flow heat transfer, and ζ^* = (z/R)/Pr^m(De・a_R)^n was selected with m=1 and n=1/2. The two critical curves fall into a single critical curve with the thus derived ζ^*_0 = (z_0/R)/Pr(De・a_R)^<1/2> [u_0 = (π/2)・R for 90゜ bend].
一般社団法人日本機械学会の論文
1988-01-25