Introduction The possibilities of using liquid instead of air in the exchange of gases have always fascinated researchers. The first studied liquid was saline solution which appeared to be unsuitable for transporting gases in normobaria. Its capacity to dissolve oxygen is low, and its viscosity and density are high as compared with air. Moreover, the introduction of saline into the lung can rem...

This paper compares three popular notions of admissibility for weak solutions of the compressible isentropic Euler equations of gas dynamics: (i) the viscosity criterion, (ii) the entropy inequality (the thermodynamically admissible isentropic solutions), and (iii) the viscosity-capillarity criterion. An exact summation of the Chapman-Enskog expansion for Grad's moment system suggests that it i...

We summarize recent results regarding the equilibrium and non-equilibrium behavior of cold dilute atomic gases in the limit in which the two body scattering length a goes to infinity. In this limit the system is described by a Galilean invariant (non-relativistic) conformal field theory. We discuss the low energy effective lagrangian appropriate to the limit a → ∞, and compute low energy coeffi...

Abstract. Exact one-dimensional steady flow equations for viscous, heat conducting calorically perfect gases were derived in terms of a velocity potential. These nonlinear differential equations were integrated numerically thus predicting detailed variation of thermodynamic and flow properties through the normal steady compression shock waves for an entire range of ratios of secondary and prima...

In this work, we discuss some numerical properties of the viscous numerical scheme introduced in [8] to solve the one-dimensional pressureless gases system, and study in particular, from a computational viewpoint, its asymptotic behavior when the viscosity parameter ε > 0 used in the scheme becomes smaller.

Shear viscosity is a measure of the amount of dissipation in a simple fluid. In kinetic theory shear viscosity is related to the rate of momentum transport by quasi-particles, and the uncertainty relation suggests that the ratio of shear viscosity η to entropy density s in units of h̄/kB is bounded by a constant. Here, h̄ is Planck’s constant and kB is Boltzmann’s constant. A specific bound has b...

Ionic liquids present intriguing possibilities for removal of carbon dioxide from a wide variety of different gas mixtures, including post-combustion flue gas, pre-combustion gases, air, and raw natural gas streams. Even by physical absorption, many ILs provide sufficient selectivity over N2, O2, CH4 and other gases. However, when CO2 partial pressures are low, the incorporation of functional g...