NDLI: Simulations to Determine Laminar Loss Coefficients in Arbitrary Planar Dividing Flow Geometries

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Evan, C. Lemley Dimitrios, V. Papavassiliou Henry, J. Neeman
Copyright Year	2007
Abstract	The goal of this study is to determine laminar stagnation pressure loss coefficients for planar dividing flow. These losses are of clear interest in understanding flow in microfluidic devices, in porous media, or other complicated laminar pore networks. There is no published set of pressure loss coefficients for arbitrary bifurcation geometries that occur in these networks. Additionally, the small number of bifurcation geometries that have been studied are for turbulent flow often found in fluid supply and drain systems. The pressure loss coefficients determined in this study allow realistic simulation of existing laminar flow networks or the design of these networks. This study focuses on a single inlet duct with two outlet ducts, which were allowed to vary in diameter, flow fraction, and angle — all relative to the inlet duct. Laminar stagnation pressure loss coefficients have been determined by simulating incompressible flow through 600 different geometries. In all cases, the flow is laminar in the inlet and outlet ducts. Simulations of the dividing flow geometries were done using FLUENT and a custom written computer code, which automates the process of creating flow geometries, of creating FLUENT input files, and of parsing FLUENT output. The outputs, pressure and velocity distributions at the inlet and outlets, have been averaged and then used to calculate pressure loss coefficients for each of the geometries and flow fraction scenarios simulated. The results for loss coefficient for the geometries considered range from 0.15 to 49. The loss coefficient for any geometry increases significantly as the flow fraction increases and as the duct size of an outlet duct relative to the inlet duct decreases. Less significant variation of the loss coefficient has been observed as a function of the angles of the exit ducts.
Sponsorship	Fluids Engineering Division
Starting Page	1323
Ending Page	1330
Page Count	8
File Format	PDF
ISBN	0791842894
DOI	10.1115/FEDSM2007-37268
e-ISBN	0791838056
Volume Number	Volume 2: Fora, Parts A and B
Conference Proceedings	ASME/JSME 2007 5th Joint Fluids Engineering Conference
Language	English
Publisher Date	2007-07-30
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Computers Turbulence Ducts Porous materials Bifurcation Flow (dynamics) Pressure Design Geometry Fluids Simulation Laminar flow Microfluidics
Content Type	Text
Resource Type	Article

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