Experimental investigation of heat transfer for nanofluid-porous magnetohydrodynamic thermally driven flow in a novel I-shaped enclosure

The present work examines experimentally the natural convection heat transfer within a three-dimensional novel I-shaped enclosure with wavy-walled and inner circular pipe. The left layer is filled by Al2O3-water nanofluid while the right layer is filled with nanofluid/porous medium. The nanofluid thermophysical properties had been measured experimentally. The thermal conductivity had been measured utilizing hot-wire approach, viscometer is used to measure the nanofluid viscosity, and densitometer is used to measure the nanofluid density. It noted that there is a good agreement between the measured nanofluid thermophysical properties and the calculated properties based upon the theoretical models within nanofluid concentrations [0-0.06]. K-type thermocouples had been installed on the left and right walls as well as along the center of the midsection in order to measure the temperature experimentally. Two cores of magnetic field had been installed with magnetic intensity of 20 mT. It had been proved that there is a slight increase in the temperature with the existence of the magnetic field. For example, at 20 mT, the temperature increases into 29.1 degrees C while the temperature equals to 28.8 degrees C at the absence of the magnetic field. Additionally, it had been illustrated that increasing the hot side wavy-walled temperature leads to an increase in the temperature difference which increases the temperature level in the nanofluid-porous region and the nanofluid region.

Automated summary

This study experimentally investigates the natural convection heat transfer in a three-dimensional I-shaped enclosure with wavy-walled and inner circular pipe. One layer is filled with Al2O3-water nanofluid while the other layer is filled with nanofluid/porous medium. The thermophysical properties of the nanofluid are measured, including thermal conductivity, viscosity, and density. The experimental results show good agreement with the calculated properties based on theoretical models within the studied nanofluid concentrations. Thermocouples are installed to measure the temperature, and magnetic fields are applied to observe the slight increase in temperature. It is also found that increasing the hot side wavy-walled temperature leads to an increase in the temperature difference in the nanofluid-porous region and the nanofluid region.