Abstract
We present a educational poster supporting the subject „Mechanics of fluids I“, which the students evaluate to be difficult mainly due to abstractness. Our goal is to show in vivo the behavior, especially the non-linearity, of various flows transiting into turbulence. The fluid motion is visualized by using the rheoscopic fluid, which consist of water and the dust of mica, whose particles are longitudinal and shiny resulting into easily observable reflections, when the particles coherently orient along the maximum stress. This happens mainly in shear layers, e.g. at the boundary between vortex core and envelope. An example of flow transiting into turbulence is the Taylor-Couette flow between two concentric cylinders, which with increasing Taylor number passes through various regimes from fully laminar bearing flow through the Taylor vortex flow (TVF) and later Wavy vortex flow (WVF) up to Turbulent Taylor vortices regime (TTV) and, finally, the regime of featureless turbulence.
Highlights
One of the moderner studies was performed by Richter et al [8], who visualized the Taylor-Couette flow in Taylor-vortex reactor used for mixing in chemical industry
Dr is fulfilled, the situation is unstable. This instability is called Görtler instability and occurs in flow at convexly curved boundary [10], which is the case of Taylor-Couette flow with outer cylinder standing, or rotating more slowly than the inner one
A one note to the Görtler problem: the thickness of the „convective region“ is related to the boundary layer thickness, which varies with the traveled distance4 and the Görtler vortices tend to change their size and number density with traveled distance, which makes their observation much more difficult than in the Taylor-Couette problem
Summary
The flowing media as water and air are important part of nature and hydrodynamics is an important part of the engineering education for the entire existence of the human civilization, which has been established in order to build huge irrigation systems in the plains of southern Iraq in 4th millennium B.C. [1]. Hydrodynamics has, as any other physical discipline, two main aspects: it is practical and it is gorgeous.
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