2成分気体の分子拡散と自然循環に関する研究 : 第2報,数値解析

In order to investigate the basic features of transportation gases, an analytical study of the combined phenomena of molecular diffusion and natural convection of two-component gases in a reverse-U-shaped tube is performed. One dimensional basic equations for continuity and conservation of momentum are numerically solved to obtain the mole fraction change and the onset time of natural circulation in the reverse-U-shaped tube. The numerical calculation is carried out in the ranges of 3.0×108≤GγTSc2≤2.5×1010, 1.4×108≤GγcSc2≤8.5×1010 and βc'(XBmax-XBmin)≤0.1029. In addition to this, the relationship between the onset time of natural circulation and the Grashof number ratio (RGr=GγT/Gγc) is expressed by t*in=2.199RGr2-2.987RGr+1.0272 when the RGr is lower than 0.66.