Thermally fully developed pipe flows of active liquids

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

Active matter laden active liquids define a unique class of liquids, whose extremely rich dynamics can be captured only by appropriately considering the contribution induced stresses. In this paper, we develop analytical solutions for studying effect background fluid flow in temperature distribution and Nusselt number thermally fully developed pipe with constant surface heat flux. Specifically, consider an liquid consisting particles demonstrating vortex defects: consequently, presence axial gradient activity, there occurs pressure-driven that has profile different from Hagen-Poiseuille non-active flow. We find case is 3.83, which smaller than classical value 4.36 observed (with flux). justify decrease noting where activity (for flows) identical to pressure flows), overall strength flows: such reduced causes convective transfer triggering flows. This also away wall greater mean temperature)

Language: Английский

Nanocapillary Core-Annular Flows of Immiscible Active and Non-Active Liquids Trigger External-Drive-Free Nanofluidic Liquid Transport

Langmuir, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

In this paper, we develop analytical solutions for investigating the nanocapillary core-annular transport of an active liquid and immiscible non-active liquid. The contains particles that show vortex defects, which trigger a circular polarization field, eventually enabling generation induced pressure-driven flow inside fluids in presence axial gradient activity (or concentration particles). Here consider two separate scenarios. For first (second) case, occupies core (annular) region while annular (core) region. Our main finding is both these cases, drives can achieve significant volume rate (of flow) appropriate strength particles); therefore, such nanofluidic driven fluid occurs with no external driving (such as pressure or applied electric field). Also, greater thickness layer increases across entire but causes nonmonotonic variation Furthermore, case where core, larger active:non-active viscosity ratio significantly enhances overall transport; however, other has effect. Finally, provide our results there finite slip at walls. We find depending on scenario (active occupying region), different signs lengths have influences magnitude direction velocity field system

Language: Английский