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A Note on the Kinematics of Rigid Molecules in Linear Flow Fields and Kinetic Theory for Biaxial Liquid Crystal Polymers

Qi Wang ,Jun Li ,Sarthok Sircar 2,Qi Wang 2

University of South Carolina and USC NanoCenter
Nankai University
2University of South Carolina

We present a systematic derivation of the extended Jefferys' orbit for rigid ellipsoidal and V-shaped polymer molecules in linear incompressible viscous flows using a Lagrange multiplier's method based on a constraining force argument [5]. It reproduces the well-known Jefferys' orbit for rotating ellipsoids [12]. The method is simple and applicable to any rigid body immersed in a linear flow field so long as a discrete set of representative points on the rigid body can be identified that possess the same rotational degrees of freedom as the rigid body itself. The kinematics of a single V-shaped rigid polymer driven by a linear flow field are discussed, where steady states exist along with time-periodic states in limited varieties. Finally, we show how the kinematics of the rigid V-shaped polymer can be used in the derivation a kinetic theory for the solution of rigid biaxial liquid crystal polymers.

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