Home

Technology

 Examples / Projects

This technology is based on the method of flow visualisation using an optically active liquid. The main part of the equipment is the modelling device shown as a shallow channel, by successively modelling few characteristic profiles of the flow object to be investigated. The corresponding channel sections for these investigations are made of plastic boards and fastened between two transparent boards that are optically inactive. The optically active liquid is led through this device and adjusted according to the relevant velocity parameters. The viscosity of this liquid differs just by 3.5% from the viscosity of water at room temperature and has thus properties analogous to real liquids. Based on the laws of the theory of similarity, both liquid and gas flows can be modelled on this test stand. By using a special light for raying through the optically active liquids, which move in the flow channel, a “field of inequality of optical densities” is obtained that clearly correlates with the internal structure of the flow or the velocity fields of the flow. The goal of these measures is to investigate the laws of organisation of the flow structure. The hydraulic experiments inside the flow channel allow to define the influence of organised flow structures on the energetic charac-teristics of movement of liquids and gases. The evaluation of these measures leads to the creation of a three-dimensional channel geometry in which the process medium flows with optimum flow parameters.

Thereby, this technology is not a technique for representing a 3-D flow, but rather for optimising a 3-D flow. The analysis of existing flow relations is limited to just a few characteristic cutting planes. Unlike the classic calculation methods, however, these cutting planes are not used for determining the mean values of velocity and pressure, as these are derived in principle from the laws of mechanics of liquids and gases. However, today these well-known laws are insufficient for solving the tasks of flow optimisation. This technique permits to acquire new and unknown information about the laws of flow structure organisation. Assumptions and simplifications with this technique are limited to a minimum, because it is based on physical modelling and the models almost completely map the real flow relations. Even if compressibility is taken into account, the correction of the results concerns only apart of the hydraulic parameters (volume and pressure), whereas the structure of flow in the correspon-ding sections, both in liquid and in gas flows, remains the same in the model as well as in the real object

The essence of this technique is the fact that in the flowing, optically active liquid, the boundary can be made visible, along which the flow moves with minimum energy loss. The modelling of flow is performed according to corresponding starting and boundary conditions that have to be specified in advance. The hydro mechanical processes can considerably be intensified and an essential reduction of hydraulic resistance can be achieved by means of the proper control of the micro structure within the boundary layer of the flow by finally optimised forms of the flow channel or by including flow items. Just one form is created in accordance with the theory of optimum processes, provided that starting and boundary conditions are determined for the wall profile of the optimised hydraulic channel. However, this may also result in considerable flow losses if the microstructure of the flow is improperly directed.

 

Forkert Technology Services GmbH
Allee der Kosmonauten 28
D-12681 Berlin
Germany
Phone: +49(0)30 / 548 00 450
Fax:     +49(0)30 / 548 01 706
eMail: info@forkert-t-s.com

 Short presentation of technology

 Corporate Brochure

obstruction in a pipe (diaphragm)

Optimization of an element of a cold air duct to the mill in a power station