Araştırmanın genel amacı; ilköğretim 4. ve 5. sınıf Fen Bilimleri dersinde araştırmaya dayalı öğrenme yaklaşımı modellerinden rehberli keşfetme modeli ile geleneksel öğretim yaklaşımına göre işlenen dersin, görme yetersizliği olan öğrencilerin fen dersine ilişkin tutumları arasında anlamlı bir farklılık olup olmadığının belirlenmesidir. Araştırmada deneysel araştırma desenlerinden çok denekli d...

Polymer additives are commonly utilized to manipulate bubbly flows in various applications. Here, we investigate the effects of clean and contaminated bubbles driven upwards (upflow) Newtonian viscoelastic turbulent channel flows. Interface-resolved direct numerical simulations performed examine sole combined soluble surfactant viscoelasticity using an efficient 3D finite-difference/front-track...

We prove the existence of large-data global-in-time weak solutions to a general class coupled bead-spring chain models with finitely extensible nonlinear elastic (FENE) type spring potentials for nonhomogeneous incompressible dilute polymeric fluids in bounded domain $ \mathbb{R}^d $, d = 2 or 3 $. The under consideration involves Navier–Stokes system variable density, where viscosity coefficie...

Abstract A Taylor–Galerkin finite element time marching scheme is derived to numerically simulate the flow of a compressible and nonisothermal viscoelastic liquid between eccentrically rotating cylinders. Numerical approximations governing constitutive equations are computed over custom refined unstructured grid piecewise linear Galerkin elements. An original extension DEVSS formulation for flu...

We consider the finite element approximation of the Oldroyd-B system of equations, which models a dilute polymeric fluid, in a bounded domain D ⊂ R, d = 2 or 3, subject to no flow boundary conditions. Our schemes are based on approximating the velocity field with continuous piecewise quadratics and either (a) piecewise constants or (b) continuous piecewise linears for the pressure and the symme...