Computational Analysis of Shear Banding in Simple Shear Flow of Viscoelastic Fluid-Based Nanofluids Subject to Exothermic Reactions

We investigated the shear banding phenomena in non-isothermal simple-shear flow of a viscoelastic-fluid-based nanofluid (VFBN) subject to exothermic reactions. The polymeric (viscoelastic) behavior VFBN was modeled via Giesekus constitutive equation, with appropriate adjustments incorporate both and nanoparticle effects. Nahme-type laws were employed describe temperature dependence viscosities relaxation times. Arrhenius theory used for modeling incorporation as single-phase homogeneous-mixture and, hence, effects nanoparticles based on volume fraction parameter. Efficient numerical schemes semi-implicit finite-difference-methods MATLAB computational solution governing systems partial differential equations. fundamental fluid-dynamical thermodynamical phenomena, such banding, thermal runaway, heat transfer rate (HTR) enhancement, explored under relevant conditions. Important novel results industrial significance observed demonstrated. Firstly, conditions Giesekus-type model, we remarkable HTR Therm-C enhancement compared to, say, NFBN. Specifically, demonstrate that are less susceptible runaway than Additionally, illustrate reduced susceptibility is further enhanced conditions, particular when becomes increasingly polymeric. Increased polymer viscosity most direct proxy measuring increase nature fluid.