Slip length and rapid fluid flow in hybrid nanochannels

Recent advances in nanofabrication have highlighted the need for advanced theoretical models to accurately estimate fluid flow enhancement and slip length (δ) in hybrid nanochannels, where one wall consists of graphene and the other is composed of a different material. In this study, we extend the formalism of the enhancement factor for rapid fluid flow in nanochannels by incorporating two key elements: the Taylor–Aris dispersion (TD) effect and the slip characteristics of hybrid nanochannels. Our method based on the TD framework is proposed to precisely determine the unknown slip length in hybrid nanochannels. Additionally, we introduce a generalized enhancement factor for fluid flow through hybrid nanochannels with height H. This expression incorporates the Peclet number (Pe) and wall slip lengths, given by ε=g+β(1+ksPe2), and reduces to the traditional form ε=1+6δ/H for nonhybrid channels. The proposed framework not only bridges the gap between classical dispersion theory and modern nanofluidic systems but also offers quantitative insights into the interplay between slip length, channel dimensions, and flow enhancement. Furthermore, this work provides a robust theoretical foundation with practical implications for applications such as microfluidics, water filtration, and advanced material design.