曲り円管の凍結破壊 : 第2報,90°曲り円管の凍結挙動

概要

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The formation of the ice growth that occurs in a 90℃ curved pipe containing water flow was investigated experimentally. The experiments were carried out under various experimental conditions over the ranges of Reynolds numbers (based on pipe i. d.) Re=294-4210 and cooling temperature ratios of the freezing parameter, T^* (=(T_f-T_w)/(T_∞-T_f), T_f=0℃, T_w=cooling pipe temperature, T_∞=temperature of flowing water) = 1.70-12.8. From the visualization of ice formation in the curved pipe, the 90° curved pipe with flowing water was first blocked by ice formation after the curved portion of the pipe, next to the upstream side of the curved pipe which had already had a narrow flow passage by ice formation was frozen, and finally, freezing of the remaining water in the curved pipe portion resulted in a pipe rupture at around the curved portion of the pipe. The transient behavior of ice formation, according to time proceeding, was expressed as the relationship between the pressure loss coefficient f and Reynolds number for various cooling temperature ratios T^*. In addition, the critical condition of perfect ice blockage in the 90° curved pipe was obtained with experimental correlation equations in terms of T^* and Re.
一般社団法人日本機械学会の論文
1987-11-25