Abstract
In an investigation which has been reported elsewhere it has been shown that a marked depression below the pressure drop of water was attained as a result of addition of model nylon fibres to the flowing system. The magnitude of this depression increased with solids concentration at high fibre aspect ratios ( L/ D's). For low L/ D values the depression was almost negligible. To explain these phenomena the turbulence characteristics of the system were measured by means of a turbulent diffusional technique based on the injection of hot water from a point source and the sensing of the downstream temperature profiles by means of a thermistor probe. These determinations were made in a vertical 2-in. lucite tube, the fibre suspensions flowing at a mean velocity of 5·6 ft./sec. Fibre diameters ranged from 20·2 to 51·6 μ and length from 0·52 to 1·21 mm. The concentration used ranged from 0·5 to 4·0% by weight. Data indicated an increase in eddy diffusivity, radial turbulence intensity and Lagrangian length scale with fibre L/ D and concentration. An explanation is advanced for the depression in pressure drop based on alterations in the turbulence characteristics in the presence of the fibres.
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