分子線束の角分布に関する研究 : 第2報,円筒形るつぼからの蒸発

概要

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Evaporation into a vacuum from a cylindrical crucible partially filled with liquid is studied by use of the direct-simulation Monte Carlo method. The evaporation rate is obtained in the near continuum to the free molecular regime for l/a =1, 3 and 5, where a is the inner radius of the crucible and l is the distance from the crucible exit to the liquid level. When l is small, the evaporation rate does not change so much with the Knudsen number Kn. The flow structure near the crucible is similar to that of the usual free jet expansion. In the far field, the density and radial velocity of gas and the probability of finding a molecule in the unit solid angle are calculated as a function of the polar angle. There flow properties in the far field are also obtained in the case of sonic efflux from a circular orifice.
一般社団法人日本機械学会の論文
1989-07-25