NUMERICAL STUDY OF EFFECTS OF PULSATILE AMPLITUDE ON UNSTEADY LAMINAR FLOWS IN RIGID PIPE WITH RING-TYPE CONSTRICTIONS

✍ Scribed by T. S. Lee; T. W. Ng; Z. D. Shi

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 345 KB
• Volume: 24
• Category: Article
• ISSN: 0271-2091
• DOI: 10.1002/(sici)1097-0363(19970215)24:3<275::aid-fld491>3.0.co;2-1

✦ Synopsis

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 010-3198; Womersley number (Nw) in the range 010-5010. The pulsatile amplitude (A) varies in the range 010-210. 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 (dp=dz) 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.