flow resistance

flow resistance

[′flō ri‚zis·təns]
(fluid mechanics)
Any factor within a conduit or channel that impedes the flow of fluid, such as surface roughness or sudden bends, contractions, or expansions.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Despite the differences in methodology and MERV ratings of filters it seems like there is a fair consensus that energy changes are not large on average, and depend very much on individual system characteristics such as duct leakage, starting system air flow resistance, etc.
A 305 mm (6 in.) long outlet section prevented additional flow resistance from a sudden expansion out of the tube.
But when profile wall thickness varies, flow balancing is much more difficult because the relationship between channel width and flow resistance isn't linear.
The company's filtration media offer high dust loading capacity, low air flow resistance and high efficiency against sub micron particles, down to 0.05 microns.
They found, however, that the flow resistance decreased in the grooved dies compared to the smooth dies.
They are manufactured to meet required physical dimensions, filtration capture rates, flow resistance, and other performance requirements.
The database contains flow resistance data for pipes, fittings, valves, and orifices.
The left-hand section of the curve is characterized by viscous flow because flow resistance in the mold becomes less as the temperature increases.
The following article, Part 1, discusses the creation and utilization of a model that can predict initial flow resistance in a pleated filter with a depth of 89 mm (3.5 in.) or less.
The basic property measured by the melt flow test is the melt viscosity or flow resistance of the polymer at a particular shear stress (related to the applied load) and temperature.
According to Minnesota Rubber/QMR Plastics, a new, double rotary valve incorporates bypass and service position rotors to provide more efficient water flow and lower flow resistance. Minnesota Rubber/QMR Plastics said it ensured that the rubber and plastic materials of the valve complemented one another, and struck a careful balance between the torque value and the sealing contact to prevent leaking.
Combined with coarse fibers, Technostat has a high dust loading and low air flow resistance. Delpore is available in various basis weights, polymers, air permiabilities and fiber diameters and can be electrostatically charged.