Scholarlink

<p>This study investigates the mixed convection flow, heat, and mass transfer characteristics of TiO<sub>2</sub> nanofluids within a vertically stretching cylindrical annulus, a configuration relevant to energy, cooling, and chemical processing systems. The objective is to assess how the choice of base fluid influences nanofluid performance when multiple physical mechanisms act simultaneously. The analysis incorporates the combined effects of variable viscosity and electrical conductivity, Arrhenius activation energy, viscous dissipation, homogeneous chemical reactions, magnetic field forces, and Darcy–Forchheimer porous-medium resistance for three base fluids: ethylene glycol, engine oil, and kerosene. The governing equations are solved numerically using the finite element method. The results reveal that magnetic forces, Forchheimer drag, viscous dissipation, and increased nanoparticle volume fraction suppress axial velocity, whereas buoyancy and permeability enhance it. Enhanced electrical conductivity improves thermal transport, while higher viscosity, Prandtl number, and radiative cooling reduce heat transfer. Among the nanofluids examined, kerosene-TiO<sub>2</sub> exhibits the highest axial transport, engine oil-TiO<sub>2</sub> shows moderate enhancement, and ethylene glycol-TiO<sub>2</sub> provides the most pronounced improvement in heat and mass transfer. These findings highlight the critical role of base fluid selection in optimising nanofluid-based thermal systems, particularly in porous and magnetised environments.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Role of base fluids in heat and mass transport of TiO2 nanofluids under annular mixed convection

  • 期刊论文

  • 发表日期：

    2026年3月9日

查看全文
  • D. Ravinder,
  • T. Kiran Kumar,
  • P. Chandrakala,
  • Amitosh Tiwari

摘要

This study investigates the mixed convection flow, heat, and mass transfer characteristics of TiO2 nanofluids within a vertically stretching cylindrical annulus, a configuration relevant to energy, cooling, and chemical processing systems. The objective is to assess how the choice of base fluid influences nanofluid performance when multiple physical mechanisms act simultaneously. The analysis incorporates the combined effects of variable viscosity and electrical conductivity, Arrhenius activation energy, viscous dissipation, homogeneous chemical reactions, magnetic field forces, and Darcy–Forchheimer porous-medium resistance for three base fluids: ethylene glycol, engine oil, and kerosene. The governing equations are solved numerically using the finite element method. The results reveal that magnetic forces, Forchheimer drag, viscous dissipation, and increased nanoparticle volume fraction suppress axial velocity, whereas buoyancy and permeability enhance it. Enhanced electrical conductivity improves thermal transport, while higher viscosity, Prandtl number, and radiative cooling reduce heat transfer. Among the nanofluids examined, kerosene-TiO2 exhibits the highest axial transport, engine oil-TiO2 shows moderate enhancement, and ethylene glycol-TiO2 provides the most pronounced improvement in heat and mass transfer. These findings highlight the critical role of base fluid selection in optimising nanofluid-based thermal systems, particularly in porous and magnetised environments.