Numerical and empirical approach to study the influence of high-frequency oscillating magnetic field and nanoparticle aggregation on rough revolving disk in a porous medium

Abstract

The combined influence of disk flow and nanoparticle aggregation is significant in many industrial and thermal management applications, because aggregation alters the thermal conductivity and flow characteristics of nanofluids, while surface roughness affects boundary layer development and frictional forces. These effects are crucial for enhancing the efficiency of cooling and thermal management devices as well as precisely forecasting nanofluid behaviour in revolving systems. Inspired by these considerations, the current work investigates how nanofluid flow across a rough revolving disk in a porous medium is affected by nanoparticle aggregation and a high-frequency oscillating magnetic field. Additionally, a comparison of aggregation and non-aggregation scenarios is provided. The governing nonlinear equations are transformed into dimensionless form and solved numerically using the Runge-Kutta-Fehlberg fourth-fifth order. The impact of different parameters on velocity and temperature profiles is examined, and the heat transfer behaviour is discussed. It’s found that the temperature distribution increases with higher heat source/sink and radiation parameters, while the velocity distribution decreases with higher permeability. The effect of nanoparticle aggregation enhances the heat transfer characteristics, compared to the non-aggregation case. Statistical optimization using response surface methodology shows strong agreement between predicted and computed results, with high accuracy indicated by R² (99.24 %), adjusted R² (98.55 %), and predicted R² (91.10 %). The current work addresses the simultaneous effects of nanoparticle aggregation, surface roughness, porous medium, and oscillating magnetic field, which have not been investigated in previous works.

Topics & Concepts