Mathematical models of convection at low gravity

We consider three mathematical models describing behaviour of nonisothermal liquid in microgravity conditions. First of them is alternative with respect to the classical Oberbeck-Boussinesq model of convection. It deals with a liquid which density is the function of temperature only but the velocity vector is no longer solenoidal. Second one is the linear model of convective flow in a weakly compressible liquid. Third model describes the motion of an emulsion or a gas-liquid mixture exposed to the thermocapillary forces and microacceleration.