Effects of Heat Transfer in Flow of Nanofluids Over a Permeable Stretching Wall in a Porous Medium

This investigation is concerned with the boundary layer flow of viscous nanofluid over a permeable stretching wall. The fluid saturates the porous medium. Four different types of nanoparticles such as Copper (Cu), Silver (Ag), Alumina (Al2O3) and Titanium Oxide (TiO2) with water as its base fluid are considered. Resulting nonlinear system is computed for the series and numerical solutions. Comparison between series and numerical solutions showed an excellent agreement. The influence of pertinent parameters such as solid volume fraction of nanoparticles, the type of nanofluids on the flow, heat transfer, entropy generation, skin friction coefficient, Nusselt number and Bejan number are discussed. The results indicate that an increase in the nanoparticle volume fraction decreases the momentum boundary layer thickness and entropy generation rate whereas the thermal boundary layer thickness increases. It is observed that such effects are found more noticeable in the Ag-water solution than in the other solutions.

Nanofluid, Entropy Generation, Wall Suction/Injection, Stretching Surface, Porous Media.