Steric Effects on Space Electroosmotic Thrusters in Soft Nanochannels
Steric Effects on Space Electroosmotic Thrusters in Soft Nanochannels
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DOI：
10.3390/math9161916
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发表时间：
2021-08
期刊：
影响因子：
2.4
通讯作者：
Jiaxuan Zheng;Beinan Jia;Yongjun Jian
中科院分区：
文献类型：
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作者：
Jiaxuan Zheng;Beinan Jia;Yongjun Jian
采用数值模拟的方法研究了空间电渗推力器（EOTs）中空间位阻效应对其性能的影响。离子种类的尺寸效应，即空间位阻效应，在许多以前的研究中被忽略，但它对静电势和电渗速度有重要的影响，这是进一步引入到本研究中，以了解和改进的探索具有软通道的纳米电渗推进器。基于有限差分法计算了推力器的推力、比冲、总输入功率、效率和推重比。结果表明，推力器的推力和比冲随位阻参数的增大而增大，而效率和推力功率比则随位阻参数的增大而减小，这是由于焦耳热耗散的增加。在真实的情况下，考虑离子尺寸的影响，虽然可以提高推力，但效率只有30- 70%，推力功率比的峰值逐渐消失。
The influence of steric effects on the performances of space electroosmotic thrusters (EOTs) was numerically delineated in soft nanochannels for which its walls are covered with polyelectrolyte materials. The size effect of the ionic species, namely the steric effect, is neglected in many previous research studies, but it has vital influences on electrostatic potential and electroosmotic velocity, which is further introduced into the present study in order to understand and improve the exploration of nano electroosmotic thrusters with soft channels. The thruster’s thrust, specific impulse, total input power, thruster efficiency and thrust-to-power ratio are computed based on finite difference methods. It is found that the thruster’s thrust and specific impulse increase with the steric parameter while the efficiency and thrust-to-power ratio possess opposite trends due to the enhancement of Joule heating dissipation. For real situations with the consideration of ion size, although the thruster’s thrust could be promoted, the efficiency is only 30–70%, and the peak values of thrust-to-power ratio fade away.