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NUMERICAL STUDY OF EFFECTS OF PULSATILE AMPLITUDE ON UNSTEADY LAMINAR FLOWS IN RIGID PIPE WITH RING‐TYPE CONSTRICTIONS
Author(s) -
Lee T. S.,
Ng T. W.,
Shi Z. D.
Publication year - 1997
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/(sici)1097-0363(19970215)24:3<275::aid-fld491>3.0.co;2-1
Subject(s) - pulsatile flow , strouhal number , mechanics , laminar flow , vorticity , reynolds number , shear stress , amplitude , physics , adverse pressure gradient , mathematics , classical mechanics , geometry , turbulence , vortex , optics , medicine , cardiology
The effects of pulsatile amplitude on sinusoidal laminar flows through a rigid pipe with sharp‐edged ring‐type constrictions have been studied numerically. The parameters considered are: mean Reynolds number ( Re ) of the order of 100; Strouhal number ( St ) in the range 0·0–3·98; Womersley number ( Nw ) in the range 0·0–50·0. The pulsatile amplitude ( A ) varies in the range 0·0–2·0. The flow characteristics were studied through the pulsatile contours of streamline, vorticity, shear stress and isobars. Within a pulsatile cycle the relations between instantaneous flow rate ( Q ) and instantaneous pressure gradient (d p /d z ) are observed to be elliptic. The relations between instantaneous flow rate ( Q ) and pressure loss ( P loss ) are quadratic. Linear relations exist between instantaneous flow rate ( Q ) and maximum velocity, maximum vorticity and maximum shear stress. © by 1997 John Wiley & Sons, Ltd.