Intensification of turbulent free heat transport in various configurations with adequate binary gas mixtures

摘要

The present paper investigates a promising avenue for the intensification of turbulent free convection in various configurations using adequate binary gas mixtures in which helium (He) is the primary gas component and carbon dioxide (CO_2), methane (CH_4), nitrogen (N_2), oxygen (O_2) and xenon (Xe) are the secondary gas components. In the context of binary gas mixtures, the thermo-physical properties: viscosity, thermal conductivity, density and isobaric heat capacity depend on three quantities: temperature, pressure and molar gas composition. Within the platform of turbulent free convection using the five binary gas mixtures for Ra > 10~9, results are presented for the allied convective coefficient h_(mix)/B varying with the molar gas composition w in the w-domain. Values of the maximum allied convective coefficients h_(mix, max)/B attained at the correlative optimal molar gas compositions w_(opt) are easily extracted from suitable design charts.