Abstract
The electrohydrodynamic (EHD) vortices produced by an electric current in freely suspended liquid crystal (LC) films of N-(4-methoxybenzylidene)-4-butylaniline (MBBA), convert to a pure rotation in the presence of external electric field (\(\it{E}_{{\rm ext}}\)) perpendicular to the current direction. Here, the direction and strength of the rotation are precisely under control by our self-made device called “liquid-film motor”. In this paper, we present experimental observations of the EHD fluid flow when external electric field varies from zero to a value in which pure rotation on the liquid crystal (LC) film is observed. We also show experimentally that the presence of external electric field causes a great decrease in the current produced by the voltage VJ required for observing EHD vortices in freely suspended films of MBBA. The LC films begin to rotate when EextVJ reaches a threshold value. This threshold is investigated experimentally as a function of voltage VJ and the external electrical field \(\it{E}_{{\rm ext}}\).
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