caa a22 4500 60546670X CHVBK 20210128100308.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00397-015-0841-3 doi (NATIONALLICENCE)springer-10.1007/s00397-015-0841-3 Bifurcation phenomenon of inertial viscoelastic flow through gradual expansions [Elektronische Daten] [Mahmood Norouzi, Mohammad Shahmardan, Amin Shahbani Zahiri] In this paper, viscoelastic fluid flows in planar gradual expansions are studied numerically for the first time. Expansion ratio is considered to be 1:3, and exponential Phan Thien-Tanner (EPTT) model is used as the constitutive equation. The investigation is carried out based on a numerical approach using finite volume method (FVM) and Pressure Implicit with Splitting of Operator (PISO) algorithm. Three angles of 30, 45, and 60° are selected to clarify the effects of gradual expansion angles. Combined effects of dynamics and rheological parameters on bifurcation phenomenon are investigated in detail. An analysis is conducted to elucidate the influences of Reynolds and Weissenberg numbers on the dynamics, shapes, length, and intensity of vortices in stable and unstable situations. The results proved that an increment in expansion angles destabilizes the flow regime. Springer-Verlag Berlin Heidelberg, 2015 Gradual expansion nationallicence Expansion angle nationallicence Asymmetric flow nationallicence Coanda effect nationallicence Polymeric fluid nationallicence EPTT model nationallicence Norouzi Mahmood Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran aut Shahmardan Mohammad Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran aut Shahbani Zahiri Amin Department of Mechanical Engineering, University of Birjand, Birjand, Iran aut Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 423-435 0035-4511 54:5<423 2015 54 397 https://doi.org/10.1007/s00397-015-0841-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00397-015-0841-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Norouzi Mahmood Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran aut NATIONALLICENCE 700 1- Shahmardan Mohammad Department of Mechanical Engineering, Shahrood University of Technology, Shahrood, Iran aut NATIONALLICENCE 700 1- Shahbani Zahiri Amin Department of Mechanical Engineering, University of Birjand, Birjand, Iran aut NATIONALLICENCE 773 0- Rheologica Acta Springer Berlin Heidelberg 54/5(2015-05-01), 423-435 0035-4511 54:5<423 2015 54 397