Poiseuille flow of phonons in solid hydrogen

Diffusion model of the thermal conductivity plateau of weak solid solutions of neon in parahydrogen

“…Khodusov and Blinkina [15] formulated the conditions for second sound to exist in quantum crystals of ortho-D 2 , para-H 2 and Ne. It was predicted exactly the same temperature range for solid parahydrogen as was found in [5,6]. The second sound and Poiseulle flow for thermal conductivity have the common physical nature.…”

“…Let us consider possible applications of this model in this paper. It was shown [5,6] that solid parahydrogen as well as solid helium due to their high purity has, as dielectric crystals, an unusual high thermal conductivity. It could indicate even a so rare phenomenon as the Poisseule flow of the phonon gas.…”

“…The heat transfer experimental data for solid hydrogen have been analyzed but not to full completion up to now. It is possible to mention results for pure hydrogen (conclusions about the possibility of Poiseuille flow of phonons [5,6]), the huge anomaly for thermal conductivity of solid parahydrogen with extremely low concentrations of heavy impurities [2]. So, it is necessary to reconsider the plateau effect [7,8] as well as interesting impurity effects with argon in solid parahydrogen, as, for example, the chromatic polarization of light due to lattice deformations created by this heavy impurity [3].…”

Observation of Poiseuille flow of phonons in black phosphorus

“…If l N increases with decreasing temperature as T −5 , then since κ ~ C 〈 v 〉 d 2 / l N , one can expect thermal conductivity to follow as T 8 ( 1 ). Experimentally, in all systems in which Poiseuille flow has been reported (namely, Bi, solid He, and H), what has been observed is a faster than T 3 thermal evolution of κ and a nonmonotonic l ph ( T ) ( 20 – 23 ), not a superlinear size dependence. This is also the case in the present study on BP.…”

Plateau effect in the thermal conductivity of solid hydrogen with neon impurity

“…The same as helium, solid hydrogen has a very high thermal conductivity [1,2], which near the maximum is very sensitive to defects. For example, 1 ppm of the neon impurity entails a more than an order of magnitude decrease.…”