JOURNAL ARTICLE

Quad-cascade picture of electrokinetic turbulence.

  • Published In: Physics of Fluids, 2025, v. 37, n. 2. P. 1 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Shi, Yanxia; Pang, Jin'an; Zhu, Yueqiang; Zeng, Ming; Nan, Keyi; Chen, Yu; Zhang, Chen; Zhao, Tianyun; Zhang, Ce; Jing, Guangyin; Wang, Kaige; Bai, Jintao; Zhao, Wei 3 of 3

Abstract

This article focuses on the development and experimental validation of a unified quad-cascade model of turbulence that couples the fluxes of kinetic energy and scalar variance, addressing limitations of classical turbulence theories in flows driven by external volume forces. Using electrokinetic (EK) turbulence in a microfluidic device as a case study, the authors demonstrate the existence of four distinct turbulent subranges characterized by different scaling laws, including inertial, constant-kinetic-energy-flux, constant-scalar-variance-flux, and variable-flux subranges. Experimental measurements of electric conductivity and velocity fluctuations via laser-induced fluorescence techniques confirm the predicted spectral behaviors and reveal localized coexistence of these subranges. The quad-cascade framework offers a comprehensive theoretical basis applicable to various turbulence phenomena such as buoyancy-driven and magnetohydrodynamic turbulence, with implications for advancing turbulence modeling and microfluidic mixing technologies.

Additional Information

  • Source:Physics of Fluids. 2025/02, Vol. 37, Issue 2, p1
  • Document Type:Article
  • Subject Area:Science
  • Publication Date:2025
  • ISSN:1070-6631
  • DOI:10.1063/5.0250162
  • Accession Number:183417296
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