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Steric Effects on Electroosmotic Nano-Thrusters under High Zeta Potentials

Author

Listed:
  • Jiaxuan Zheng

    (School of Mathematical Science, Inner Mongolia University, Hohhot 010021, China)

  • Siyi An

    (School of Mathematical Science, Inner Mongolia University, Hohhot 010021, China)

  • Yongjun Jian

    (School of Mathematical Science, Inner Mongolia University, Hohhot 010021, China)

Abstract

Here, space electroosmotic thrusters in a rigid nanochannel with high wall zeta potentials are investigated numerically, for the first time, considering the effect of finite size of the ionic species. The effect, which is called a steric effect, is often neglected in research about micro/nano thrusters. However, it has vital influences on the electric potential and flow velocity in electric double layers, so that the thruster performances generated by the fluid motion are further affected. These performances, including thrust, specific impulse, thruster efficiency, and the thrust-to-power ratio, are described by using numerical algorithms, after obtaining the electric potential and velocity distributions under high wall zeta potentials ranging from −25.7 mV to −128.5 mV. As expected, the zeta potential can promote the development of thruster performances so as to satisfy the requirement of space missions. Moreover, for real situation with consideration of the steric effect, the thruster thrust and efficiency significantly decrease to 5–30 micro Newtons and 80–90%, respectively, but the thrust-to-power ratio is opposite, and expends a short specific impulse of about 50–110 s.

Suggested Citation

  • Jiaxuan Zheng & Siyi An & Yongjun Jian, 2021. "Steric Effects on Electroosmotic Nano-Thrusters under High Zeta Potentials," Mathematics, MDPI, vol. 9(24), pages 1-16, December.
    • Handle: RePEc:gam:jmathe:v:9:y:2021:i:24:p:3222-:d:701337
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    References listed on IDEAS

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    1. Abdulhameed, M. & Muhammad, M.M. & Gital, A.Y. & Yakubu, D.G. & Khan, I., 2019. "Effect of fractional derivatives on transient MHD flow and radiative heat transfer in a micro-parallel channel at high zeta potentials," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 519(C), pages 42-71.
    2. I. Levchenko & S. Xu & G. Teel & D. Mariotti & M. L. R. Walker & M. Keidar, 2018. "Recent progress and perspectives of space electric propulsion systems based on smart nanomaterials," Nature Communications, Nature, vol. 9(1), pages 1-19, December.
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