Admittedly, extensive accurate results are now available on the momentum and heat transfer characteristics for a stationary cylinder in unconfined power-law fluids in the steady flow regime for both shear-thinning and shear-thickening fluids. Finally, again the flow reverts to a steady flow regime at Re = 100. As Newtonian fluids flow over cylinder is not steady for every Re, non Newtonian fluids have also critical Re showing unsteadiness at about Re = 46–47 which is reported in. Non Newtonian fluids flow over rotating cylinders is included in many industrial applications such as coating operations, roller bearing applications, oil drilling operations, mixing vessels with novel impeller designs, etc. Also imposing rotation to cylinders in order to control boundary layer on cylinder or other kinds of bluff bodies has been devoted much attention. Newtonian fluids flow across cylinders is one of those typical problems have been investigated in many researches due to extensive applications. Behavior and response to shear stress of shear-thinning and shear-thickening fluids are shown in Fig. Non-Newtonian fluids are divided into two categories: (1) shear-thinning fluids, and (2) shear-thickening fluids. Typical examples can be polymer melts and solutions, foams, emulsions and suspensions, etc. Introduction Most real fluids in industrial and academic applications aren't considered as Newtonian fluids, they denote non-Newtonian behavior, in which the shear stress is not linearly proportional to the velocity gradient.
0 kommentar(er)
