In this paper the bubble issuing from an orifice at the bottom of the boundary evolution in a finite Non-Newtonian fluid(such as Maxwell fluid,Carreu fluid)is numerically simulated The effects of the rheological behavior,physical parameters and circumstantial conditions are discussed in detail

The dynamical processes of a Newtonian spherical drop rising freely through shear-thinning fluids expressed by the generalized Cross-Carreau (Carreau–Yasuda) model were considered experimentally and computationally. The local effects of shear-thinning on the drop motion, which are hard to evaluate from an experimental approach, are clearly revealed by the numerical results. The relation between the drop motion and the change in viscosity is clearly indicated and considered in detail for the cases in which the non-Newtonian fluids are highly and weakly pseudoplastic. In addition, the modified Reynolds and Morton numbers are discussed in order to describe the drop or bubble free motion in shear-thinning fluids using a more convenient and practical form.

Numerical Simulation of Bubble Evolution in Non-Newtonian Fluid

A numerical study of the motion of a spherical drop rising in shear-thinning fluid systems

The deformation of a Newtonian drop in uniaxial flow of a viscoelastic fluid is studied via numerical computations. The viscoelastic fluid is modeled using the FENE-CR constitutive theory. The computations are performed for two values of the Chilcott–Rallison extensibility parameter L2 = 144 and L2 = 600, for Deborah numbers between 0 and 2, and for several values of the concentration parameter c in the range appropriate for dilute (Boger) solutions. It is found that the deformation is always increased for the viscoelastic fluid compared to the shape in a Newtonian fluid, and that there is a viscoelastic mechanism (an `instability' of shape) that tends to produce a high curvature at the tips of the drop. The magnitude of stress gradients immediately downstream from the tip of the drop are reduced as the viscosity ratio (interior/exterior) is reduced, though the viscoelastic contribution to the drop deformation is actually increased for small viscosity ratios.

Numerical Simulation of Bubble Evolution in Non-Newtonian Fluid

Citations

A numerical study of the motion of a spherical drop rising in shear-thinning fluid systems

The deformation of a Newtonian drop in the uniaxial extensional flow of a viscoelastic liquid

Related Papers (5)

Single bubble rising behaviors in Newtonian and non-Newtonian fluids with validation of empirical correlations: A computational fluid dynamics study

Complex flow around a bubble rising in a non-Newtonian fluid.

Numerical and experimental investigations of an air bubble rising in a Carreau-Yasuda shear-thinning liquid

Transition from laminar to turbulent flow for non-Newtonian fluids

The numerical solution of the steady flow of Newtonian and non-Newtonian fluids through a contraction