Journal of Applied Mechanical Engineering

Investigation of flow dynamics in microcavities with different inlet types

3^rd International Conference on Fluid Dynamics & Aerodynamics

October 25-26, 2018 | Berlin, Germany

Paulius Vilkinis and Nerijus Pedisius

Lithuania Energy Institute, Lithuania

Posters & Accepted Abstracts: J Appl Mech Eng

Abstract:

Statement of the Problem: The flow separation phenomena caused by abrupt expansion in channel geometry, such as backwardfacing step is point of interest in many engineering applications related to fluid mixing and heat transfer enhancement like combustors, heat sinks and microreactors. Practically, this channel expansion is usually limited in length by forward-facing step, resulting whole geometry to have the shape of the cavity. The flow structure inside the cavity depends on cavity geometry and inlet flow conditions. In this study open-type microcavity with different inlet types is investigated. Methodology & Theoretical Orientation: Experimental and computational methods are used to investigate flow structure in cavities. Micro-particle image velocimetry system is used to obtain two-dimensional flow velocity fields and velocity profiles. Experimental results are also compared to computational fluid dynamics simulations. The commercially available computational fluid dynamics (CFD) package Ansys Fluent and the Reynolds stress ??? baseline model is used for two-dimensional simulations. Findings: Flow structure inside the cavity depends on inflow geometry. Length and position of primary and secondary vortices are analyzed depending of flow regime in the channel. These findings are also anticipated to help design applications containing various shapes of cavities.

Biography :

E-mail: paulius.vilkinis@lei.lt