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Copyright of Assiut Journal of Agricultural Sciences is the property of Egyptian National Agricultural Library (ENAL) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Assiut Journal of Agricultural Sciences is the property of Egyptian National Agricultural Library (ENAL) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The Stokes flow due to a rotlet in a circle is determined. The solution shows that for a certain position of the rotlet, the (low has a second stagnation point symmetrically placed inside the circle. Thus, a "blinking rotlet" model can be constructed in which the rotlet that is "off" does not disturb the flow. This model is useful for comparisons with experimental and computational investigations of this phenomenon in a cylindrical tank with two rotating cylinders. [ABSTRACT FROM AUTHOR]

Chaotic advection can be produced whenever the kinematic equations of motion for passively advected particles give rise to a nonintegrable dynamical system. Although this interpretation of the phenomenon immediately shows that it is possible for flows at any value of Reynolds number, the notion of stochastic particle motion within laminar flows runs counter to common intuition to such a degree that the range of applicability of early model results has been questioned. To dispel lingering doubts of this type a study of advection in a two-dimensional Stokes flow slowly modulated in time is presented. Even for this very low Reynolds number, manifestly "laminar" flow chaotic particle motion is readily realizable. Standard diagnostics of chaos are computed for various methods of time modulation. Relations to the general ideas of parametric resonance and adiabatic invariance are pointed out. [ABSTRACT FROM AUTHOR]

Focuses on the Stokes flow due to a rotlet in a circle. Second stagnation point of the flow that is symmetrically placed inside the circle; Notion that time-dependent laminar flows can have chaotic particle paths, a phenomenon known as chaotic advection; Preference for blinking rotlet model when discussing chaotic advection.