Inertial resistance factor

Inertial resistance factors characterizing the porous media... 

At high flow velocities, the inertial resistance factor, 2, can be viewed as a loss per unit length along the flow direction, thereby allowing the pressure drop to be specified as a function of dynamic head. 

Wang et al, (2010a) calibrated the inertial resistance factor, C2/, used in the porous media model in a bench scale set-up using membrane bundles with the same packing density as the Siemens Memcor Memjet BIOR HF membranes that are used in the full-scale plant being modelled. The pressure drops across the membrane bundle for flow directions perpendicular and parallel to the membrane bundle and at different fluid viscosities were measured for various liquid velocities. The empirical correlations used for modelling the pressure drop caused by tube banks were found to underestimate the pressure drop caused by the HF bundles (Fig. 15.10). 

With good diy scrubbing sorbents, the controlling resistance for gas cleaning is external turbulent diffusion, which also depends on energy dissipated by viscous and by inertial mechanisms. It turns out to Be possible to correlate mass-transfer rate as a fimctiou of the fric tiou Factor. 

Permeability. Permeability is the hydraulic conductance of a medium defined with direct reference to Darcy s law. In a somewhat more general sense, the shear factor is the hydraulic resistivity of the medium. When the term permeability is used, one normally refers to linear flow systems (no inertial effects). 

Owing to that the offered device has low factor of hydraulic resistance, there is an opportunity to raise increase speed of a gas stream that provides more intensive display centrifugal—inertial forces and raises increases efficiency of process of tap removal of firm particles on walls of the cylindrical chamber. The firm particles which have been not caught by a drop liquid under action of centrifugal forces, also change a direction of the movement and direct to an internal surface of the chamber covered by a film of a liquid, and are grasped by her it. ... 

Inertial loading All the instrumented impact tests, except for the split Hop-kinson pressure bar, result in high specimen accelerations that manifest as inertial forces in the system. These must somehow be accounted for to derive any meaningful information, as they may account for a considerable portion of the recorded load. In the initial period of the impact event, a beam or a plate specimen is accelerated, and the inertial force induced in addition to the force required to bend the specimen. As a result during this time period, the recorded load is considerably greater than that resisted by the beam. This shows up as an oscillation in the total load vs. time curve. The duration of this inertial effect is short, and it was recommended by Server [56] that for reliable impact measurements the time to fracture should exceed the time of inertial oscillation by a factor of 3. Beyond that time, the measured load is equal to the bending load in the sped men. Unfortunately, concrete is too brittle for this condition to be met, since the time to fracture is too short. 

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