Cellular convection by MalkusVeronis

By MalkusVeronis

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15 Rheopectic behavior in a saturated polyester (Steg and Katz 1965). container was rolled gently in the palms of hands. Thus, the structure formation is facilitated by a gentle shearing motion (rolling) but a more intense motion (shaking) destroys the structure. This suggests that there is a critical amount of shear beyond which re-formation of structure is not induced but breakdown occurs. They attributed this behavior to the anisometric shape of RAJ: “dk3171_c002” — 2006/6/8 — 23:03 — page 31 — #23 32 Bubbles, Drops, and Particles in Fluids gypsum particles.

2 for a few aqueous solutions and suspensions (Chhabra, 1980). Considerable confusion exists in the literature regarding the effect of temperature on the values of power-law constants. 56–883 1–50 the consistency coefficient m decreases with increasing temperature. In most process engineering applications, it is sufficient to neglect the temperaturedependence of the flow behavior index and to use the usual Arrhenius-type expression to approximate the temperature dependence of the consistency coefficient (Chhabra, 1999b).

Therefore, there exists a delicate balance between the efficacy of a constitutive relation to describe the behavior of a fluid in well-defined flows and the utility of the fluid-model parameters so evaluated in interpreting the behavior of the same fluid in a complex flow problem.

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