Viscous non-Newtonian fluids

This procedure can be repeated for different values of N. A compilation of the experimental values of ks for a variety of impellers, turbine, propeller, paddle, anchor, and so on, has been given by Skelland(16), and an examination of Table 7.1 suggesLs that for pseudo-plastic liquids, ks lies approximately in the range of 10-13 for most configurations of practical interest/22 231 SKELLAND l6) has also correlated much of the data on the agitation of purely viscous non-Newtonian fluids, and this is shown in Figure 7.8. 

Friction factor chart for purely viscous non-Newtonian fluids. (See Friction Factor Charts on page 349.)... 

Friction factor chart for purely viscous non-Newtonian fluids... 

The flow equations are taken here as the Navier-Stokes equations, with some extensions to purely viscous non-Newtonian fluids. In vector form, the Navier-Stokes equation is... 

Li, G.Q., Yang, S.Z., Cai, Z.L., and Chen, J.Y. (1995), Mass transfer and gas-Uquid circulation in an airlift bioreactor with viscous non-Newtonian fluids, The Chemical Engineering Journal and the Biochemical Engineering Journal, 56(2) bl01-bl07. 

Additives minimize viscosity, increase solids loading capacity, and enhance mixture stability CLMs are highly viscous, non-Newtonian fluids and must be stable with respect to sedimentation and subsidence Fuel parameters abrasiveness (nozzle and pump wear) atomizabiUty carbon conversion flame stability... 

Hiraoka, S., I. Yamada and K. Mizoguchi, Two dimensional model analysis of flow behaviour of highly viscous non-Newtonian fluid in agitated vessel with paddle impeller , J. Chem. Eng. Japan 12, 1, 56-62 (1979). 

Hartnett and Kostic [12] studied a number of correlations for predicting the turbulent friction factor of purely viscous non-Newtonian fluids flowing in circular and non-circular geometries. They concluded that the Dodge-Metzner Equation 7 was the best over the entire range of power law value. 

In viscous non-Newtonian fluids, large bubbles produced near the sparger by coalescence rise in the presence of a large number of tiny bubbles. A bimodal bubble size distribution is found ... 

In heat transfer in a fluid in laminar flow, the mechanism is one of primarily conduction. However, for low flow rates and low viscosities, natural convection effects can be present. Since many non-Newtonian fluids are quite viscous, natural convection effects are reduced substantially. For laminar flow inside circular tubes of power-law fluids, the equation of Metzner and Gluck (M2) can be used with highly viscous non-Newtonian fluids with negligible natural convection for horizontal or vertical tubes for the Graetz number Nq, > 20 and n > 0.10. 

ISOTHERMAL FLOW OF PURELY VISCOUS NON-NEWTONIAN FLUIDS... 

ISOTHERMAL FLOW OF PURELY VISCOUS NON-NEWTONIAN FLUIDS TABLE 2.9 Comparison of Predictions for Different Methods of Computation... 

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