Flow behavior index temperature effect

The flow behavior index (n) is assumed to be relatively constant with temperature and concentration, and the combined effects of temperature and concentration on the power law consistency index, K, are described by ... 

SOI. Tomato concentrates are very shear-thinning fluids with reported magnitudes of the flow behavior index being in the range of 0.22 to 0.26. The effect of temperature on the apparent viscosity can be described by the Arrhenius model. The magnitude of Eaof twelve out of sixteen concentrates was about 9.63 kJ/mol (AS) ... 

If power law behavior is assured, we can separately consider the effect of temperature on /z, the flow behavior index. Table 3-3 shows the effect of temperature on n. 

The pour point of petroleum is an index of the lowest temperature at which the crude oil will flow under specified conditions. The maximum and minimum pour point temperatures provide a temperature window where petroleum, depending on its thermal history, might appear in the liquid as well as the solid state. The pour point data can be used to supplement other measurements of cold flow behavior, and the data are particularly useful for the screening of the effect of wax interaction modifiers on the flow behavior of petroleum. 

Most of the other properties of vitreous silica are only slightly affected by the hydroxyl concentration. While it is possible to measure the effect of hydroxyl content on the density, refractive index, thermal expansion coefficient, dielectric constant, and other properties of vitreous silica, the effects are very small as compared to those for the flow and optical transmission behavior. The density of commercial vitreous silica ranges from 2.197 to 2.203 gcm while the refractive index is 1.457 0.003 for most products. Since the effects of hydroxyl on the properties of vitreous silica are of the same magnitude as the effects of changes in fictive temperature, it is very difficult to separate the effect of hydroxyl from those of thermal history. 

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