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Wall Shear Measurment in Sand-Water Mixture Flows
The wall shear stress was measured in clear-water and sand-water mixture flows with the use of a flush-mounting hot-film shear-sensor. Data were obtained with two shear-sensors and two different sands (d50 = 0.45 mm and d50 = 0.88 mm) with solids concentrations of up to Cmax = 1.6% by volume, and for flow Reynolds numbers of 105 < RD < 6 × 105. The measured sensor wall shear stresses were compared with the true wall shear stresses obtained with the energy head loss measurements conducted in a pipeline system. The results of the tests in the clear-water flows confirmed the relationship between the sensor power output, PS, and the wall shear stress, τo, given by τol/³ = APS + B, in which A and B are calibration coefficients. The tests with the low-concentration sand-water mixtures in a vertical pipe indicated that for the present range of experiments, sensor power outputs with the mixtures exceeded those for clear-water by an average of 5%. It is shown that the shear-sensors are delicate but accurate instruments that can be used for the measurement of the wall shear stress.
Wall Shear Measurment in Sand-Water Mixture Flows
The wall shear stress was measured in clear-water and sand-water mixture flows with the use of a flush-mounting hot-film shear-sensor. Data were obtained with two shear-sensors and two different sands (d50 = 0.45 mm and d50 = 0.88 mm) with solids concentrations of up to Cmax = 1.6% by volume, and for flow Reynolds numbers of 105 < RD < 6 × 105. The measured sensor wall shear stresses were compared with the true wall shear stresses obtained with the energy head loss measurements conducted in a pipeline system. The results of the tests in the clear-water flows confirmed the relationship between the sensor power output, PS, and the wall shear stress, τo, given by τol/³ = APS + B, in which A and B are calibration coefficients. The tests with the low-concentration sand-water mixtures in a vertical pipe indicated that for the present range of experiments, sensor power outputs with the mixtures exceeded those for clear-water by an average of 5%. It is shown that the shear-sensors are delicate but accurate instruments that can be used for the measurement of the wall shear stress.
Wall Shear Measurment in Sand-Water Mixture Flows
Yücel, Öner (Autor:in) / Graf, Walter H. (Autor:in)
Journal of the Hydraulics Division ; 101 ; 947-963
01.01.2021
171975-01-01 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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