Pattern selection in a liquid crystal flow
Başlık çevirisi mevcut değil.
- Tez No: 626113
- Danışmanlar: DOÇ. DR. DANIŞMAN YOK
- Tez Türü: Doktora
- Konular: Astronomi ve Uzay Bilimleri, Fizik ve Fizik Mühendisliği, Astronomy and Space Sciences, Physics and Physics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2004
- Dil: İngilizce
- Üniversite: The University of Manchester
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 135
Özet
We present results from an experimental study which is concerned with the priority exchange of patterns in a dual-frequency nematic liquid crystal under the effect of an applied sinusoidal electric field. The aim of the work was to investigate an intrinsic mechanism for the exchange processes. A device with microscopic electrodes was initially constructed in order to contain the liquid crystal and apply an electric field to a specified portion of it. The geometry of the device was such that electrodes of different sizes overlapped at thirty-six separate locations to give a distinct small aspect ratio at each crossing. The flow pattern resulting from the electric field effect was then examined as a function of aspect ratios and frequency of the applied field. The first experiment concerning the priority exchange of patterns was performed for two convective flow states. In this case, the patterns of interest comprised of four or six convection rolls. Our results confirm that the priority exchange of these states follow the general mechanism proposed by Benjamin. Specifically, unfolding of a transcritical bifurcation takes place during the exchange process. The second experiment was conducted to study the competition between a convective flow and a static re-alignment state of the liquid crystal molecules known as a Freedericksz transition. The results of this experiment revealed a complex bifurcation sequence including evidence for a dual cusp.
Özet (Çeviri)
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