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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Visualization of Mechanical Processes: An International Online Journal


ISSN Онлайн: 2152-209X

Archives: Volume 1, 2011 to Volume 9, 2019

Visualization of Mechanical Processes: An International Online Journal

DOI: 10.1615/VisMechProc.2014007940

SHEAR SENSITIVE LIQUID CRYSTALS FOR DIAGNOSTICS OF BOUNDARY LAYER STRUCTURE IN AERODYNAMICAL EXPERIMENT

Galina Zharkova
ITAM SB RAS, Russia
Valentina Kovrizhina
Khristianovich Institute of Theoretical and Applied Mechanics (ITAM) SB RAS
Alexander Petrov
St. Petersburg National Research University of Information Technology, Mechanics and Optics; Institute of Theoretical and Applied Mechanics

Краткое описание

The paper presents a brief introduction in the materials and methods of the panoramic diagnostics of shear stresses, induced by the flow on the model surface, by liquid crystals. Two mechano - optical effects in liquid crystals with helicoidal supermolecular structure (texture transition from con-focal to planar liquid crystal texture and shift of the selective reflection peak of initially planar texture), which form the bases of experimental techniques, are considered. The optical response of liquid crystals manufactured at ITAM was investigated by the spectral and colorimetric methods. Some results obtained under sub-sonic velocities give evidence of wide possibilities of the technique.

Ключевые слова: shear stress, visualization, measurements, liquid crystals

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