Categories: BGNews Date: дек 9, 2009 Title: Обединен семинар по механикаНа 17.12.2009 г. (четвъртък) от 13.30 часа в зала 200 на ИМех доклад ще изнесе проф. Хр. Христов (Dept of Mathematics, Univ. of Louisiana at Lafayette, LA, USA).
На 17.12.2009 г. (четвъртък) от 13.30 часа в зала 200 на Института по механика -БАН проф. Христо Христов от Университета на Луизиана в Лафайет, САЩ ще изнесе доклад на тема:
Abstract: It was found that Maxwell-Cattaneo law for the relaxation processes in heat conduction leads to paradoxical results if the material body is moving, and it was shown that the use of a convective derivative removes the paradox (see ). In the resting frame, the equations are the same as in a frame that moves with constant velocity. The formulation of  led to a typical coupled system, from which a single equation for the temperature could not be obtained. A material-invariant (frame indifferent) version of the Maxwell-Cattaneo law has been recently proposed in  where the relaxation rate of the heat flux is given by Oldroyd's upper-convected derivative. We discuss here the features of the new formulation, e.g., the possibility of elimination of the heat flux and obtaining a single equation for the temperature field. This feature is to be expected from a truly frame indifferent description. The problem of heat convection in a vertical slot subject two both horizontal and vertical pressure gradient is considered as a featuring example where the contribution of Oldroyd terms can be identified explicitly.
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