Journal of Non-Newtonian Fluid Mechanics· 2026Q1
Lubricant viscosity effects on flow regimes of viscoplastic fluids over patterned surfaces
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- Q1SCImago
- 2026year
Short summary
Lubricant viscosity ratio (μr) critically determines flow regimes of viscoplastic fluids over patterned surfaces, with low μr promoting plug breakage and high μr preserving plug integrity.
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Key points
- Lubricant viscosity ratio (μr) is the primary factor controlling the deformation and breakage of the unyielded plug in viscoplastic fluids.
- Low μr lubricants facilitate plug deformation and breakage by allowing wall-induced perturbations to transmit.
- High μr lubricants suppress perturbation transmission, preserving a stable, intact unyielded plug.
- Four distinct flow regimes are identified based on plug breakage and interfacial yielding, influenced by μr and groove geometry.
AI-generated from the title and abstract; the full text is not read.
Abstract
We study plane Poiseuille flow of a viscoplastic Bingham fluid over a lubricant-infused patterned wall using fully coupled two-phase numerical simulations, with viscoplasticity modeled via the Papanastasiou regularization. The effects of groove geometry (aspect ratio 𝑑 and periodicity ℓ ), flow parameters (Reynolds and Bingham numbers), and lubricant viscosity (viscosity ratio 𝜇 𝑟 ) are systematically examined. The morphology of the central unyielded plug depends strongly on 𝜇 𝑟 : low-viscosity lubricants promote penetration of wall-induced perturbations, leading to plug deformation and breakage, whereas high-viscosity lubricants suppress perturbation transmission and preserve an intact plug. The coupled influence of 𝜇 𝑟 and groove geometry also governs the formation of an unyielded region above the liquid/lubricant interface, yielding four distinct flow regimes distinguished by central plug breakage and interfacial yielding. Interface pinning and depinning are further controlled by groove geometry, flow inertia, and lubricant viscosity, with low-viscosity lubricants inducing earlier depinning and high-viscosity lubricants maintaining a pinned interface over a wider range of flow conditions.
The authors' abstract, as published at the source. Journal of Non-Newtonian Fluid Mechanics, 2026 · DOI ↗
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Fluid Flow and Transfer ProcessesChemical Engineering