VORTICITY IN LIQUID HE 2 FLOW THROUGH ORIFICES

被引:9
作者
CARERI, G
CERDONIO, M
DUPRE, F
机构
[1] Istituto di Fisica, Università di Roma, Rome
来源
PHYSICAL REVIEW | 1968年 / 167卷 / 01期
关键词
D O I
10.1103/PhysRev.167.233
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Recent experiments in wide channels have shown a marked difference between the critical velocity observed in pure superfluid flow and thermal counterflow; because of the lack of a satisfactory hydrodynamical theory, the reason for this difference remains obscure. In the present work we have investigated the onset of superfluid vorticity for these two types of flow through small orifices of some tenths of a millimeter i.d., by means of the technique of trapping of negative ions. Our results show that the same difference is also observed in our much simpler geometry; namely, we find the same paradox already found in channels, that is the law vs,cd=const, expected to hold in pure superfluid flow, is instead followed only in the thermal counterflow, and the effect is geometry-independent. © 1968 The American Physical Society.
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页码:233 / +
页数:1
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