Drag Force on a High Porosity Aerogel in Liquid 3He

Drag Force on a High Porosity Aerogel in Liquid 3He
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液体 3He 中高孔隙率气凝胶的阻力

DOI:
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发表时间:
2012
期刊:
影响因子:
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通讯作者:
K. Nagai
K. Nagai
中科院分区:
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文献类型:
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作者:
H. Takeuchi;S. Higashitani;K. Nagai

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讨论了高孔隙率气凝胶在液态氦中的拖曳力及其对声传播的影响。拖曳力是由不同的法律取决于努森数Kn,准粒子平均自由程的比率,以一个特征线性尺寸的身体浸在液体中。在液态~ 3 He-气凝胶体系中,特征长度尺度为气凝胶束直径,通过改变温度可以在正相达到克努森极限(Knudsen limit)和流体力学极限(Hydrodynamic limit)。我们发现,这两个限制之间的交叉可以被发现作为一个剧烈的变化,在气凝胶中的液体3 He的正常相的声衰减的温度依赖性。
We discuss the drag force exerted on a high porosity aerogel in liquid 3He and its effect on sound propagation. The drag force is governed by distinct laws depending on the Knudsen number Kn, the ratio of the quasiparticle mean free path to a characteristic linear size of a body immersed in liquid. In the liquid 3He-aerogel system, the characteristic length scale is aerogel strand diameter and both of the Knudsen limit (Kn ≫ 1) and the hydrodynamic limit (Kn ≪ 1) can be achieved in the normal phase by varying temperature. We show that the crossover between the two limits can be found as a drastic change in the temperature dependence of sound attenuation in the normal phase of liquid 3He in aerogel.
气凝胶中液体^3He中声音传播的碰撞阻力效应
DOI: --
发表时间: 2001
期刊: J. Phys. Soc. Jpn 70(12)
影响因子: --
作者:
H.Takayanagi;K.Nitta S.Ishikawa;J.Nakamura;R.Yagi;L.Zhu;S.Yamanaka;H.Fukuoka;H.Fukuoka;K.Tanigaki;D.H.Chi;Y.Ren;G.M.Kalvius;M.Nakajima;D.Huo;K.Miyamoto;M.Koyama;H.Sato;K.Yamamoto;T.Fukunaga;T.Fujiwara;折茂慎一;J.Nakamura;T.Oguchi;T.Takasaki;H.Takagiwa;H.Takagiwa;S.Kobayashi;H.Tou;K.Shimada;H.Sato;G.Goll;T.Sasakawa;T.Goto;Y.Echizen;Y.Muro;J.Kitagawa;A.S.Miguel;K.Kunii;E.Reny;L.Zhu;X.Chen;N.Okuda;O.Syshchenko;H.Takagiwa;H.Tou;Y.Nakamori;T.Fujiwara;J.Tamura;J.Nakamura;T.Iwasaki;A.S.Miguel;X.Chen;J.Tamura-Okada;T.Goto;M.Matsunami;H.Okamura;F.Iga;H.Okamura;G.M.Kalvius;S.O.Hong;K.Shimada;J.Kitagawa;K.Prokes;H.Sato;S.Qiao;S.Qiao;H.Sato;H.Sato;H.Sato;Y.Ueda;S.Orimo;K.Koyama;T.Fujiwara;S.Orimo;T.Fujiwara;T.Fukunaga;O.Syshchenko;O.Syshchenko;K.Yagasaki;T.Oguchi;H.Momida;K.Oka;Yu-Jun Zhao;小口多美夫;小口多美夫;小口多美夫;T.Ekino;T.Ekino;T.Ekino;T.Ekino;M.H.Jung;T.Ichikawa
通讯作者: T.Ichikawa