Thermal analysis of micropolar nanofluid in partially heated rectangular enclosure rooted with wavy heated rods

Abstract

Thermal flow fields subject to finite spaces bounded by heated walls claim numerous applications like electronic cooling systems, cooling towers, furnaces, and thermal individualities in buildings and rooms to mention just a few. The factor in this regard is internal convection also termed natural convection. Owing to such importance of the thermal flow field in the enclosure we examine the internal convection aspects in a rectangular enclosure having wavy heated rods filled with nano micropolar fluid. The thermal flow field is mathematically modelled. Koo and Kleinstreuerli models for the thermophysical characteristics of nanofluids are taken into account. The numerical technique is used to account for solutions. The flow intensity, temperature distribution, and Nusselt number are offered by means of graphs. The results are shared for a micropolar parameters (0≤R≤5), nanoparticles volume fraction (0.1≤φ≤0.3) and Rayleigh numbers (104≤Ra≤106). The results demonstrate that for higher values of Ra, φ and R, the thermal flow field improved. The influence of the nanoparticles volume fraction is favorable for minimizing the costs of heat transfers. For both upper and lower heated lengths, the Nusselt number increases as the Rayleigh number increases. For the micropolar fluid parameter, the Nusselt number has an increasing effect at the lower heated length, while at the upper heated length the Nusselt number shows a declining nature.

Keywords

• Micropolar fluid
• Natural convection
• Rectangular enclosure
• Nano fluid
• Sinusoidal heated rods