CFD Simulations of Fluid Flow Characteristics in Wavy Micro-Channels with Obstructions

Ashraf Balabel, Abdelfattah Mahrous

Abstract

This work presents Computational Fluid Dynamics (CFD) simulations of laminar fluid flow characteristics through wavy micro-channels with obstructions. Two types of obstructions were computationally studied namely, cylindrically and spherically shaped obstructions. Based on the shape of obstacles, two micro-channels having the same hydraulic diameter were investigated: rectangular and cylindrical micro-channels. In addition, the position of obstructive elements next to either the crests or troughs of the wavy surface was computationally studied. The axial velocity and the corresponding pressure distributions in the transverse and longitudinal directions of flow were investigated near the regions of obstacles in order to predict the flow behavior. The computational results showed that the longitudinal and axial velocity profiles and the corresponding pressure distribution can predict the position of the obstacles through the flow stream. An important feature of the flow field can be observed in the case of spherical obstacles: the existences of negative velocity near the region of obstacles. This can be considered as a precursor of the flow separation. The region of expected flow separation would be increased by increasing the obstacle diameter as well as by increasing the flow Reynolds number. In general, the application of the present study is most appropriate to bioengineering as it resembles the study of blood flow and pressure in arteries and blood vessels where arteries are being changed in geometry and structure due to the existence of cholesterol cells.

Keywords

Computational fluid dynamics; Laminar flow; Micro-channel; Obstacles; Wavy surfaces.

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