superfluid helium ii

18, 1218 (1974)). 19, 773 (1976)) form. Für He-Flüssigkeiten gilt also das Modell der Bose-Einstein-Kondensation nur qualitativ, für die erwähnten Gase auch quantitativ. This is a fairly high velocity so superfluid helium can flow relatively easily up the wall of containers, over the top, and down to the same level as the surface of the liquid inside the container, in a siphon effect as illustrated in figure 4. 9, 1214 (1965); V. V. Arsenin and V. A. Chuyanov, At. Es ist zu beachten, dass die Bose-Einstein-Kondensation nicht im Widerspruch zum Zwei-Fluid-Modell steht. Eq.

JETP 8, 282 (1959)) and modified (V. L. Ginzburg and A.

���v�|���K���C3�-F���v���~�()���G]*���fj�k�F�ݎ�A� ��,���|���6��ތΒ�6�I����D19�|��|slw(��vY�BA�AҋD�B�@��%�����=��y��ɻv��C'QZ�v�M�.^� �$��㰯��&����M;� Using neutral particles of hydrogen-helium mixture, it has been possible to visualize superfluid vortex lines and rings, and … Phys. Phys. Die Temperatur ist vom Druck abhängig und kann in der Praxis durch unterschiedlich starkes Pumpen zwischen 1,1 und 2,1 K eingestellt werden.

<> Phys. The models are based on the simplified form of the inter-particle potential between helium-4 atoms in the superfluid phase.

In the He-I region the helium behaves like a normal fluid; in the He-II region the helium is superfluid. A. Sobyanin (JETP Lett.

��O��Q� I���76��z��xU�=����Zi���0�H���ʳ��nڝɜ�2:�{��7 The flow rate of He II was investigated experimentally and theoretically as a function of the thermomechanical driving forces for pore sizes of the order of 10/sup 4/ cm magnitude. Abstract . Phys.

Transl. Namely, the potential is assumed to be of the hard-sphere type.This is a two-scale approach which describes the superfluid component of liquid helium-4.

Je niedriger die Temperatur unterhalb einer kritischen Temperatur ( In a container, lifted above the liquid level, it forms visible droplets as seen in figure 5. The simulation is based on the commercial CFD code FLOW-3D. Predictions of He II behavior in low-g conditions are calculated and the results of the single-fluid model are compared to the two-fluid model.

Liquid helium also has this property, but, in the case of He-II, the flow of the liquid in the layer is not restricted by its viscosity but by a critical velocity which is about 20 cm/s.

At the so-called Lambda temperature, where the normal fluid density equals the total density, the helium-4 is no longer superfluid. Fusion Research, Tokyo, 1974, IAEA, Vienna, 1975, Vol. (MHR) - Sov. Lebrun 1. and L. Tavian . This is the line that separates two fluid regions in the phase diagram indicated by He-I and He-II. 42, 1644 (1973); R. Lowder and K. Thomassen, Phys. 9!qd"�a�L�=ؚ���34#��C��S�aj�m{��_�{*�6��Z9U����n�s3�D�E�)I=`�m�V/�����}W_�(������l�. Phys.

Under certain conditions, a current of the superfluid willThermomechanical circulation effect in superfluid helium-II75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY - Sov.

(See Another fundamental property becomes visible if a superfluid is placed in a rotating container. Transl. (ZK9�Q"�$���&��DFE���)H��؛'!�p-�2$l�r�Be@\'˪�C�]fܜ�s.�ZKP(q�OMW/ �� =/#�=��Vo�J�[}8tpNJL*+�"[�q��`���(�Sf��gE�ی)�]��~gc_��T����޾�A�9��R({y���[��;�u���(r�n�\%zZ��RY�B�:EIѻ����Խ��4/o�p Usp. A comparison is made of the present results with the calculations carried out by other authors.

The code implements Landau`s `two fluid` model of helium II, which postulates a `superfluid` component (which has zero viscosity and zero entropy) and a `normal fluid` component (which has the properties of helium I). A. Nepomnyashchii, JETP Lett.

Although the phenomenologies of the superfluid states of helium-4 and helium-3 are very similar, the microscopic details of the transitions are very different.

Transl. Der Anteil der Teilchen, der im Grundzustand kondensiert ist, hängt von der Temperatur ab. The superfluid flow through the tunnel was much steadier than it was in similar tunnels used in previous experiments.

Tech.

Phys. Liquid Helium II - The Superfluid. A. Nepomnyashchii and Yu.

A. Sobyanin, Sov. Cooling schemes are discussed in terms of heat transfer performanceand limitations. CONF-720803-.

To provide the proper background, the classical porous medium conditions and the experimental arrangement used in this study are reviewed first. In a rotating vessel, only the ‘normal’ phase is carried along while the ‘superfluid’ phase is stationary.

25, 141 (1968); V. V. Arsenin, At.

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