NDLI: Annular Extrudate Swell of Newtonian Fluids: Effects of Compressibility and Slip at the Wall

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mitsoulis, Evan
Copyright Year	2007
Abstract	Numerical simulations have been undertaken for the benchmark problem of annular extrudate swell present in pipe extrusion and parison formation in blow molding. The effects of weak compressibility and slip at the wall are studied through simple linear laws. The finite element method is used to provide numerical results for different inner/outer diameter ratios κ under steady-state conditions for Newtonian fluids. The present results provide the shape of the extrudate, and, in particular, the thickness and diameter swells, as a function of the dimensionless compressibility and slip coefficients, B and Bsl, respectively. The pressures from the simulations have been used to compute the excess pressure losses in the flow field (exit correction). Weak compressibility slightly affects the thickness swell (about 1% in the range of simulations 0⩽B⩽0.02) mainly by a swell reduction, while slip drastically reduces the swelling to 1–2% for obvious slip (Bsl≈1) and to 0 for perfect slip (Bsl>10). The exit correction increases with increasing compressibility levels and is highest for the tube (κ=0) and lowest for the slit (κ=1). It decreases monotonically to 0 as the dimensionless slip coefficient reaches its asymptotic limit of perfect slip. All results are ordered with the diameter ratio κ, between the limits of tube (κ=0) and slit (κ=1).
Starting Page	1384
Ending Page	1393
Page Count	10
File Format	PDF
ISSN	00982202
e-ISSN	1528901X
Journal	Journal of Fluids Engineering
Volume Number	129
Issue Number	11
DOI	10.1115/1.2786491
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	2007-06-05
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Compressibility Flow (Dynamics) Fluids
Content Type	Text
Resource Type	Article
Subject	Mechanical Engineering

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