U D Kini
Articles written in Pramana – Journal of Physics
Volume 4 Issue 1 January 1975 pp 19-24 Liquids
Effect of an axial magnetic field on the Poiseuille flow of a nematic liquid crystal
The effect of an axial magnetic field on the Poiseuille flow of nematic
Volume 5 Issue 2 August 1975 pp 101-106 Liquids
Flow of cholesteric liquid crystals—I: Flow along the helical axis
U D Kini G S Ranganath S Chandrasekhar
It is shown that the essential features of Helfrich’s permeation model for flow along the helical axis of a cholesteric liquid crystal can be derived approximately on the basis of the Ericksen-Leslie theory.
Volume 7 Issue 4 October 1976 pp 223-235 Liquids
The effect of magnetic fields and boundary conditions on the Couette flow of nematics
The paper discusses the theory of Couette flow of a nematic liquid crystal. The apparent viscosity, orientation and velocity profiles are computed for
Volume 7 Issue 6 December 1976 pp 378-384 Liquids
The effect of magnetic fields and boundary conditions on the shear flow of nematics
The flow of a nematic liquid crystal between plane parallel plates, with one plate moving with uniform velocity relative to the other, is discussed. The apparent viscosity, orientation and velocity profiles are computed for
Volume 10 Issue 2 February 1978 pp 143-153 Liquids
Homogeneous instabilities in nematic liquid crystals
The effect of a magnetic field on the instability threshold in shear flow and plane Poiseuille flow of nematics has been worked out for the case of unperturbed director orientation normal to the plane of shear. The critical shear rate for the onset of instability has been studied as a function of destabilising field. The dependence of the time constant
Volume 14 Issue 6 June 1980 pp 463-475 Liquids
Steady low shear rate cholesteric flow normal to the helical axis
Steady cholesteric flow at low shear rate normal to the helical axis is studied analytically for shear flow and plane Poiseuille flow on the basis of Leslie’s continuum theory. For general asymmetric solutions the angle made by the director at the sample centre with the primary flow is found to profoundly affect the oscillations of the apparent viscosity with pitch for pitches of the order of the sample thickness. The velocity and orientation profiles are also found to change drastically. These considerations may be important in flow experiments on long pitch cholesterics.
Volume 15 Issue 3 September 1980 pp 231-244 Liquid Crystals
Effect of destabilizing fields on hydrodynamic instabilities in nematics
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 (
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