Effect of cavity aspect ratio on mixed convective heat transfer phenomenon inside a lid-driven cavity due to elastic turbulence

This study performs extensive numerical simulations to investigate how the aspect ratio ( AR) of a lid-driven cavity influences onset elastic instability and turbulence subsequent mixed convective heat transfer rate inside it. To this end, we utilize finite volume method based open source code OpenFOAM along with Rheotool solve mass, momentum, energy, viscoelastic constitutive equations. We find that dependency AR on is highly complicated depending upon values Richardson Ri) Prandtl numbers Pr). At low Ri, continuously decreases irrespective value number fluid type, i.e., Newtonian or viscoelastic. The same trend also observed at high Ri Pr. these combinations Pr, always higher in fluids than due presence former fluids. However, different both combination increases fluids, whereas it Therefore, AR, despite latter contrast assumption phenomenon transport processes. A possible explanation for behavior provided study. Along aspects, provide detailed discussion corresponding flow dynamics cavity. In particular, (and turbulence) delayed Weissenberg as increases. line prior experimental studies reported literature.