Global thermodynamic, transport-property and dynamic characteristics of the Venus lower atmosphere below the cloud layer

This study investigates the global characteristics of the Venus lower atmospherebelow the cloud layer. Starting from available data regarding species composition,temperature and pressure, the general thermodynamic and transport properties ofthe Venus lower atmosphere are first computed at altitudes below the cloud layer.The thermodynamic and transport properties are validated with known data. Athermodynamic stability analysis for a variety of potentially existing mixtures isconducted to highlight the sensitivity of the thermodynamic regime to the variationof the species molar fractions. The limits of thermodynamic stability are representedin the thermodynamic phase diagram of the mixture, and thus regions ofphase stability and instability are determined. It is found that the Venus loweratmospherethermodynamic regime is located in the stable, single-phase regime,with supercritical conditions occurring in the lower few kilometers, thereby validatingad-hoc expectations which have never envisaged the existence of a two-phaseregime at those altitudes. Using thermodynamic and transport-property informationthus computed, several non-dimensional numbers are calculated. The Prandtlnumber is first evaluated. Then, the characteristic Reynolds number is estimatedfor different assumed length scales, showing that, independent of the length scale,the entire lower atmosphere below the cloud deck is in a fully-turbulent flow regime.Finally, the speed of sound and the Mach number are computed as function of altitude.The information obtained from all these calculations fills a scientific void,and may be crucial for the design of landers on the Venus surface.