DURGUN POROZ ORTAMDAN LİNEER VE LİNEER OLMAYAN VİSKOELASTİK AKIŞKANLARIN AKIŞI VE ISI TRANSFERİ İÇİN MATEMATİKSEL MODEL DENKLEMLERİ

Yıl 2007, Sayı: 014, 97 - 106, 17.12.2007

Bayram Alakuş Ramazan Köse

Öz

Geçirgen heterojen ortamdaki akışkanın matematiksel modellemesi, Resin Transfer Molding, Injection Molding,

vs. gibi birçok imalat proseslerinde önemli bir yer tutar. Bu araştırmada, Local Volume Averaging Technique

metodu ile elde edilen 3 boyutlu, zamana bağlı izotermal olmayan genel bir matematiksel model elde edildi. Model,

ortalama hız, basınç, polimerik gerilmeleri ve sıcaklık değerlerini kütle, momentum ve enerji korunum kanunlar ile

polimerik gerilme modellerini kullanarak elde etmektedir. Polimerik akışkan gerilmeleri için lineer (UCM ve

Oldroyd-B modelleri) ve lineer olmayan (Giesekus ve PTT modelleri) modeller kullanılarak polimerik akışkanın

viskoelastik karakteristikleri ortaya konulabilir.

Anahtar Kelimeler

Mathematical modeling, porous media, non-isothrmal viscoelastic fluid flows

GOVERNING EQUATIONS FOR QUASI-LINEAR AND NONLINEAR VISCOELASTIC FLUID FLOWS AND HEAT TRANSFER THROUGH STATIONARY POROUS MEDIA

Öz

Mathematical modeling involving porous heterogeneous media is important in a number of composite

manufacturing processes, such as resin transfer molding (RTM), injection molding and the like. In this research, a

mathematical model by utilizing the local volume averaging technique to establish 3-D, time dependent and nonisothermal

governing equations is presented. The developments should be able to predict the averaged velocity,

pressure, polymeric stress and temperature fields by modeling the conservation laws (e.g. mass, momentum and

energy) of the flow field coupled with constitutive equations for polymeric stress field. The governing equations

of the flow are averaged for the fluid phase. Furthermore, the model target a variety of viscoelastic models (e.g.

Newtonian model, Upper-Convected-Maxwell Model, Oldroyd-B model, Giesekus model and PTT modl) to

provide a fundamental understanding of the elastic effects on the flow field. The present research is focused on

non-isothermal considerations and a variety of constitutive models accounting for the viscoelastic flow behaviors

Anahtar Kelimeler

Mathematical modeling, porous media, non-isothrmal viscoelastic fluid flows

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