الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
Increasing efforts are being directed towards applying the technologies of micro-fluidic, to the development of micro –devices for a wide range of applications such as medical, biological , engineering and related technologies. For example in the medical field positive displacement micro-screw pump used in small devices for discharging effusion from middle ear for treatment of otitis media. The design of micro-screw pump for viscous fluid is described . in the present study, the steady performance of the micro-pump will be investigated numerically.
The micro-screw pump operation depends on the surface sweep forces. It consists of a screw placed inside a micro channel. When the screw rotates, a net force is transferred to the fluid due to the differential pressure on the depth of the thread and pressure gradient along the screw axis, thus causing the fluid to displace. The present numerical investigation is a comparative study of a steady flow behavior in a micro-channel with rotating screw with different operational and design parameters.