SPECIAL TOPIC—Non-equilibrium phenomena in soft matters |
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Propulsive matrix of a helical flagellum |
Zhang He-Peng (张何朋)a, Liu Bin (刘斌)b, Bruce Rodenbornc, Harry L. Swinneyc |
a Department of Physics and Astronomy and Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai, China;
b School of Natural Sciences, University of California, Merced, California, USA;
c Department of Physics and Center for Nonlinear Dynamics, University of Texas at Austin, Austin, Texas, USA |
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Abstract We study the propulsion matrix of bacterial flagella numerically using slender body theory and the regularized Stokeslet method in a biologically relevant parameter regime. All three independent elements of the matrix are measured by computing propulsive force and torque generated by a rotating flagellum, and the drag force on a translating flagellum. Numerical results are compared with the predictions of resistive force theory, which is often used to interpret micro-organism propulsion. Neglecting hydrodynamic interactions between different parts of a flagellum in resistive force theory leads to both qualitative and quantitative discrepancies between the theoretical prediction of resistive force theory and the numerical results. We improve the original theory by empirically incorporating the effects of hydrodynamic interactions and propose new expressions for propulsive matrix elements that are accurate over the parameter regime explored.
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Received: 25 July 2014
Revised: 20 October 2014
Accepted manuscript online:
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PACS:
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47.63.-b
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(Biological fluid dynamics)
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47.63.Gd
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(Swimming microorganisms)
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87.17.Jj
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(Cell locomotion, chemotaxis)
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87.16.Qp
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(Pseudopods, lamellipods, cilia, and flagella)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11104179), the Shanghai Pujiang Program, China (Grant No. 12PJ1405400), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, China (Grant No. SHDP201301), and the Innovation Program of Shanghai Municipal Education Commission, China (Grant No. 14ZZ030). |
Corresponding Authors:
Zhang He-Peng
E-mail: hepeng_zhang@sjtu.edu.cn
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Cite this article:
Zhang He-Peng (张何朋), Liu Bin (刘斌), Bruce Rodenborn, Harry L. Swinney Propulsive matrix of a helical flagellum 2014 Chin. Phys. B 23 114703
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