Universality of temperature distribution in granular gas mixtures with a steep particle size distribution

Distribution of granular temperatures in granular gas mixtures is investigated analytically and numerically. We analyze space uniform systems in a homogeneous cooling state (HCS) and under a uniform heating with a mass-dependent heating rate \(\Gamma_k\sim m_k^{\gamma}\). We demonstrate that for steep size distributions of particles the granular temperatures obey a universal power-law distribution, \(T_k \sim m_k^{\alpha}\), where the exponent \(\alpha\) does not depend on a particular form of the size distribution, the number of species and inelasticity of the grains. Moreover, \(\alpha\) is a universal constant for a HCS and depends piecewise linearly on \(\gamma\) for heated gases. The predictions of our scaling theory agree well with the numerical results.