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<p>This study examines the influence of activation energy and dissipation on convective heat transfer in nanofluid flow within a vertical channel, incorporating Brownian motion and thermophoresis under the effect of irregular heat sources. The nonlinear governing equations are solved using the Runge-Kutta shooting technique, providing insights into velocity, temperature, and nanoparticle concentration variations under different parametric variables. The present study examines the key parameters, including the dissipation Ec, activation energy E<sub>1</sub>, Brownian motion parameter Nb, thermophoresis parameter Nt, thermal radiation Rd and variable viscosity δ, non-linear heat source A<sub>1</sub>, B<sub>1</sub> on the behaviour of the flow system. Results indicate that the temperature and nanoparticle concentration grow, and velocity is augmented with increased activation energy (E<sub>1</sub>) thermal diffusivity/temperature excess ratio (δ)). An increase in thermal diffusivity/temperature excess ratio (δ) enhances velocity and temperature but diminishes nanoparticle concentration.</p>

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Effect of Activation energy on heat and mass transfer of nanofluid flow with Brownian motion and irregular heat sources

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • G. Sreedevi,
  • K. Sree Ranga Vani

摘要

This study examines the influence of activation energy and dissipation on convective heat transfer in nanofluid flow within a vertical channel, incorporating Brownian motion and thermophoresis under the effect of irregular heat sources. The nonlinear governing equations are solved using the Runge-Kutta shooting technique, providing insights into velocity, temperature, and nanoparticle concentration variations under different parametric variables. The present study examines the key parameters, including the dissipation Ec, activation energy E1, Brownian motion parameter Nb, thermophoresis parameter Nt, thermal radiation Rd and variable viscosity δ, non-linear heat source A1, B1 on the behaviour of the flow system. Results indicate that the temperature and nanoparticle concentration grow, and velocity is augmented with increased activation energy (E1) thermal diffusivity/temperature excess ratio (δ)). An increase in thermal diffusivity/temperature excess ratio (δ) enhances velocity and temperature but diminishes nanoparticle concentration.