Electrokinetic energy conversion of electro-magneto-hydro-dynamic nanofluids through a microannulus under the time-periodic excitation  

作　　者：Guangpu ZHAO Jiali ZHANG Zhiqiang WANG Yongjun JIAN 

机构地区：[1]College of Sciences,Inner Mongolia University of Technology,Hohhot 010051,China [2]Transportation Institute,Inner Mongolia University,Hohhot 010021,China [3]School of Mathematical Science,Inner Mongolia University,Hohhot 010021,China

出　　处：《Applied Mathematics and Mechanics(English Edition)》2021年第7期1029-1046,共18页应用数学和力学（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.11772162,11802147);the Natural Science Foundation of Inner Mongolia(No.2018LH01015);the Foundation of Inner Mongolia Autonomous Region University Scientific Research Project(No.NJZY18093);the Foundation of Inner Mongolia University of Technology(No.ZD201714)。

摘　　要：In this work,the effects of externally applied axial pressure gradients and transverse magnetic fields on the electrokinetic energy conversion(EKEC)efficiency and the streaming potential of nanofluids through a microannulus are studied.The analytical solution for electro-magneto-hydro-dynamic(EMHD)flow is obtained under the condition of the Debye-Huuckel linearization.Especially,Green’s function method is used to obtain the analytical solutions of the velocity field.The result shows that the velocity distribution is characterized by the dimensionless frequency?,the Hartmann number Ha,the volume fraction of the nanoparticlesφ,the geometric radius ratio a,and the wallζpotential ratio b.Moreover,the effects of three kinds of periodic excitations are compared and discussed.The results also show that the periodic excitation of the square waveform is more effective in increasing the streaming potential and the EKEC efficiency.It is worth noting that adjusting the wallζpotential ratio and the geometric radius ratio can affect the streaming potential and the EKEC efficiency.

关 键 词：electrokinetic energy conversion(EKEC)efficiency NANOFLUID streaming potential magnetic field time-periodic excitation 

分 类 号：O357.1[理学—流体力学]