Abstract
Flow characteristics of conservative two-dimensional dense cloud released instantaneously from water surface into a well-mixed ambient fluid with uniform velocity are investigated experimentally. A series of laboratory experiments is conducted to understand flow mechanism and to obtain flow characteristics of the considering flow. It is found that dense cloud is advected in the horizontal direction at the nearlysame speed as uniform flow velocity and is descent in the vertical direction in a similar manner to that in a quiescent fluid, and that the behaviour of dense cloud in a uniform flow is somewhat different from those in a quiescent fluid because weaker recirculating motion is formed as the existence of uniform flow.
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