5. Shadow and refractometric methods

I.A. Znamenskaya, N.A. Vinnichenko, F.N. Glazyrin
Faculty of Physics, Moscow State University, Russia

Application of background oriented schlieren method to the studies of flows of non-isothermal fluid

The work presents the results of experimental studies of heat conductivity and convection in water by means of background oriented schlieren (BOS) method. Vector field of displacement between two images is evaluated using cross-correlation technique. The density is obtained by solving Poisson equation with special boundary conditions. It is shown that BOS method provides qualitatively reliable data for the structure of flow field corresponding to theoretical predictions, and the quantitative temperature data obtained matches the direct measurements well.
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