Technische Anwendungen flüssiger Kristalle

Methods of measuring convective mass transfer. The principal methods of measuring convective transfer of momentum, heat, and mass are surveyed on the basis of the three‐fold analogy existing between the transfer of momentum, heat, and mass. The most simple and most sensitive method is the mass transfer technique based on the principle of absorption with chemical reaction and coupled colour reaction. It is shown by selected examples that this measuring technique is already developed to the point where it serves adequately for the solution of most complex problems met with in practice. It is distinguished by its high accuracy of measurement, simple application, high local resolution, and its utilizability both for developable as well as for undevelopable surfaces. By way of the local mass transfer observable as colour‐intensity distribution it also affords a simple and illustrative means of making flow processes on solid surfaces visible. The quantitative evaluation is accomplished by reflectance photometry; quantitative image processing methods are available for complex distributions. In addition, it is shown that the mass transfer technique is also suitable for practical utilization as a method for measuring turbulence. The measuring principle is based on the extremely high dependence of the length of transitional separation bubbles in the nose section of flat plates of finite thickness in longitudinal flow on the turbulence intensity.

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Verfahren zum Sichtbarmachen von Gasströmungen

Kottke

1980

Chemie Ingenieur Technik

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Techniques for the visualization of gas flow. Flow processes with separation on surfaces of any shape can be calculated only in isolated cases. Thus, owing to the considerable technical and economic significance of flow processes particular importance attaches to techniques for their visualization as well as for their measurement. The complex variety of flow processes on flow past or through objects requires simple fast methods usable without any great amount of know‐how. Most flow visualization techniques are based on basic process engineering processes. These techniques are surveyed, as they apply to incompressible gas flow. They can be divided into three categories, depending upon whether the entire flow field, the flow adjacent to the boundary layer, or the effects of flow processes on a solid wall (wall effects) are to be visualized. Significant advances have been made in techniques for the visualization of wall effects, which are reported here.

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Technische Anwendungen flüssiger Kristalle

Cited by 10 publications

References 56 publications

Moderne Hilfsmittel für die Konstruktionspraxis

Moderne Hilfsmittel für die Konstruktionspraxis

Meßmethoden konvektiver Stoffübertragung

Verfahren zum Sichtbarmachen von Gasströmungen

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