ABSTRACT
Double-diffusive convection can arise in a fluid that contains opposing gradients of two buoyancy components with different molecular diffusivities. A necessary condition for double-diffusive convection is that the difference between the coefficients of molecular diffusion of the two components be large enough. Density differences are the basic cause of double-diffusive convection. Utilizing particles in double-diffusive convection is limited due to the low velocities involved and the density variations present in the fluid. Since in double-diffusive convection density variations are due to two components, say, temperature and salinity, it is necessary to know the distribution of one component in conjunction with the density measurements in order to obtain a complete knowledge of the flow. Utilizing particles in double-diffusive convection is limited due to the low velocities involved and the density variations present in the fluid. The chapter shows that the variety of techniques utilized is a direct consequence of the variety of phenomena existing in double-diffusive convection.
