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在用水泥抹底的活动玻璃水槽中,进行了含盐稀淤泥悬浮液与自来水的对比试验。两种流体系均为充分发展的恒定均匀的光滑紊流。在雷诺数Re为13500至40000范围内,测量了明渠液面坡降,并用旋桨式流速仪测量了紊流核心区的时均流速分布。液面坡降和时均流速分布的测量结果均一致表明,含盐稀淤泥悬浮液在所试验的雷诺数范围内,出现了紊流减阻现象。试验还表明,含盐稀淤泥悬浮液的减阻率,防雷诺数和含盐浓度的增加而加大。然而,含盐稀淤泥悬浮液在本试验条件下,表现为一种低效的减阻流体。
In the activities of cement with the bottom of the glass sink, the salty salt sludge slurry and tap water contrast test. Both flow systems are well-developed, constant, uniform, smooth turbulent flows. In the range of Reynolds number Re of 13,500 to 40,000, the slope of open channel was measured and the mean velocity distribution in the core area of turbulence was measured by propeller velocity meter. The measurement results of the liquid surface gradient and the mean velocity distribution consistently show that turbulent drag reduction appears in the range of Reynolds number of the salt-containing silt suspension. The tests also showed that the drag reduction rate, anti-reynolds number and salt concentration of the salt-containing silt suspension increased. However, salt-containing silt suspensions show an inefficient drag reducing fluid under the conditions of this test.