Forces in the flow of liquid He II

Physica Pub Date : 1974-11-01 DOI:10.1016/0031-8914(74)90243-2

G. Van Der Heijden , A.G.M. Van Der Boog, H.C. Kramers

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引用次数: 17

Abstract

Flowing liquid He II through a capillary is studied, for types of flow in which the velocities v_n and v_n, of the normal fluid and the superfluid respectively, can be varied independently. A survey of the measurements from all types of flow is given in diagrams of the (v_n, v_n) plane, in which curves of constant ρS ΔT, ρΔμ, and ΔP are given. These diagrams include curves for isothermal flow (ΔT = 0), flow without a chemical-potential difference (Δμ = 0), and isobaric flow (ΔP = 0). The results indicate that the normal fluid is moving laminarly both in subcritical flow and supercritical flow. In supercritical flow apart of the mutual friction force F_sn, a frictional force F_s, connected with the superfluid, is observed. A general relation between the ratio F_sn/F_s and the relative velocity (v_n-v_s) is found, which is more complicated than the pattern obtained with pure superfluid flow (paper II, Physica 61 (1972) 566).

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液体流动中的力He II

研究了正常流体和超流体的速度分别为vn和vn可独立变化的流体He II在毛细管中的流动类型。在(vn, vn)平面的图中给出了所有类型流的测量结果，其中给出了恒定ρS ΔT， ρΔμ和ΔP的曲线。图中包括等温流动(ΔT = 0)、无化学位位差流动(Δμ = 0)和等压流动(ΔP = 0)的曲线。结果表明，正常流体在亚临界流动和超临界流动中都是层流运动。在超临界流动中，在相互摩擦力Fsn分离的情况下，观察到与超流体有关的摩擦力f。发现了比Fsn/Fs与相对速度(vn-vs)之间的一般关系，这比纯超流体流动获得的模式更复杂(论文II, Physica 61(1972) 566)。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Physica

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