One of the most successful, fascinating and useful applications of mathematics has been in the study of motions of fluids (gases and liquids).The perfect or ideal fluids are characterized by the assumptions that for then the stress tensor is a linear function of the rate of strain tensor and the stress vector on a plane surface in contact with a fluid is normal to the surface. About seven decades ago phenomena were observed which could not be explained on the assumptions of this theory. When the assumptions of this theory were examined, it was considered feasible to relax the assumption of...