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Chirality. 2017 Feb;29(2):97-102. doi: 10.1002/chir.22675. Epub 2016 Dec 26.

Chirality-specific lift forces of helix under shear flows: Helix perpendicular to shear plane.

Author information

1
Department of Mathematics and Physics, Chongqing University of Science and Technology, Chongqing, People's Republic of China.

Abstract

Chiral objects in shear flow experience a chirality-specific lift force. Shear flows past helices in a low Reynolds number regime were studied using slender-body theory. The chirality-specific lift forces in the vorticity direction experienced by helices are dominated by a set of helix geometry parameters: helix radius, pitch length, number of turns, and helix phase angle. Its analytical formula is given. The chirality-specific forces are the physical reasons for the chiral separation of helices in shear flow. Our results are well supported by the latest experimental observations.

KEYWORDS:

chiral objects; chiral separation; screw; slender-body theory; vorticity direction

PMID:
28019677
DOI:
10.1002/chir.22675

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