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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/948

Title: Effect of destabilizing fields on hydrodynamic instabilities in nematics
Authors: Kini, U.D.
Keywords: Roll instability
Nematics
MBBA
HBAB
Homogeneous instability
Shear flow
Plane Poiseuille flow
Issue Date: Sep-1980
Publisher: Indian Academy of Sciences, Bangalore, India.
Citation: Pramana, 1980, Vol. 15, p231-244.
Abstract: The effect of destabilizing fields on the roll instability (RI) threshold for shear flow and on the homogeneous instability (HI) threshold for plane Poiseuille flow of nematic HBAB (μ3 > 0) is studied on the basis of the continuum theory of nematics for flow cells of infinite lateral width. It turns out that the critical shear rate and wave vector at RI threshold decrease with increasing destabilizing field but do not approach zero at the Freedericksz transition. However calculations show that beyond the Freedericksz threshold HI may be favourable over a range of destabilizing field with shear in the stabilizing role. For plane Poiseuille flow a similar analysis points to the existence of a HI threshold in the presence of destabilizing field beyond the Freedericksz threshold again with shear acting as a stabilizing field. These results are compared with theoretical results obtained previously for MBBA
URI: http://hdl.handle.net/2289/948
ISSN: 0304-4289
Copyright: Indian Academy of Sciences, Bangalore, India.
Appears in Collections:Research Papers (SCM)

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