الفهرس 
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Abstract
A theoretical investigation concerns with the transient flow in microchannels for slip and noslip conditions was studied. This type of flow exists in many applications, such as engineering, biological, optical, aerospace and cooling of integrated electronic circuits.The flow in microchannels is accompanied with a great pressure gradient, therefore the design and operation of such channels requires a small channel length.The developing length in such channels is expected to be considerable with respect to the channel length. A numerical model was proposed using the governing equations and the boundary conditions for slip and noslip conditions. These equations were written in dimensionless form and a computer program was constructed by C language using the finite element technique. The obtained results for slip and noslip conditions include; the velocity distribution at different locations and different time levels, the flow rate as function of time, the pressure distribution along the channel as a function of time and the developing length as a function of time. Also a new correlation for the developing length as a function of Reynolds number was obtained for slip condition. The results show that the developing length represents a considerable value of the total microchannel length