The Oldroyd-B fluid has become the starting point for almost all complex flow calculations and analysis involving behavior of dilute polymer solutions. reasons this are clear: based on kinetic theory high molecular weight “phantom” chains near equilibrium, resulting model, in its simplest form, produces a single mode description solution constitutive equation terms symmetric dyad order paramete...

A high molecular polymer solution with viscoelasticity has the effect of reducing frictional drag, which is quite practical for energy saving. Effective simulations viscoelastic flows in a pipeline Reynolds number realized by incorporating constitutive equation into k−ε−v′2¯−f turbulence model. The Finitely Extensive Nonlinear Elastic Peterlin (FENE-P) model employed characterizing viscoelastic...

The theory for the non-isothermal rheology of polymer fluids proposed in Curtiss and Bird (Adv Polym Sci 125:1–101, 1996) used several approximations including so-called linear gradient temperature field Brownian forces. While it had significant advantage dealing with equations, involved may have led to non-physical predictions. This work is a continuation (1996) that obtains corresponding non-...

We consider a dilute suspension of dumbbells joined by finitely extendible nonlinear elastic connector evolving under the classical Warner potential , . The solvent consideration is modelled compressible Navier–Stokes system defined on torus with d = 2, 3 coupled Fokker–Planck equation (Kolmogorov forward equation) for probability density function dumbbell configuration. prove existence unique ...

Bu çal??man?n amac?; fen bilimleri dersinin teknoloji destekli olarak yürütülmesinin ve gerçekle?tirilen Web 2.0 uygulamalar?n?n ortaokul 6. s?n?f ö?rencilerinin fene teknolojiye yönelik tutumlar?na etkisini ortaya koymakt?r. Gerçekle?tirilen çal??mada nicel ara?t?rma yöntemlerinden ön test-son test kontrol gruplu yar? deneysel desen kullan?lm??t?r. Çal??ma grubunu, Kars ilinin Merkez ilçesinde...

Bu araştırmada, ortaokul öğrencilerine uygulanan STEM (Science, Technology, Engineering, Mathematic) etkinliklerinin, öğrencilerin alanına yönelik tutumlarına ve fene motivasyonlarına etkisi incelenmiştir. Araştırma deneme öncesi deneysel desenlerden tek grup ön-son test modelinde yürütülmüş örneklemi Ankara ilindeki bir özel ortaokulda eğitim alan 70 öğrenciden oluşturmaktadır. Öğrencilerden e...