The principal laws of semi-empiric description. Oespite the fact that the magnetic field exerts a stabilizing influence on the flow of conducting fluids, the flows in most MHO-devices are turbulent. Questions of the hydrodynamics of turbulent flows of conducting fluids have been dealt with since the very beginning of research into magneto-hydrodynamic processes, i.e. since the classical studies by Hartmann and Lazarus. However, no remarkable advances have been made so far in solving the problems of MHO turbulence, although the contributions to this field are numerous. The reasons for this are quite objective. No single-valued semi-empiric description of MHO-turbulence can be ensured without detailed information not only on the integral characteristics of flows in the magnetic field, but also on reliable local measurements of the flow structure. Moreover, turbulence under conditions of MHO-interaction is of a much more involved nature than in the non-magnetic case. Alongside with the anisotropy due to shear flows in channels or in the boundary layer, a definite role is also played by the anisotropy arising from the anisotropic character of the electromagnetic forces.A detailed illumination of MHO-turbulence lies outside the scope of the aims of the present book, therefore let us confine ourselves only to a general analysis of the principal laws governing semi-empiric description of inductionless turbulent flows in channels and dwell on Heat and Mass Transfer in MHD Flows Downloaded from www.worldscientific.com by LA TROBE UNIVERSITY on 06/20/16. For personal use only.
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