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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Water engineering : Flow inside a tall plunging dropshaft
Flow inside a tall plunging dropshaft
Author : YIYI MA(1),(2), DAVID Z. ZHU(1),(2), N. RAJARATNAM(2)
ABSTRACT
Dropshafts are widely used in urban drainage systems to transfer stormwater or wastewater from a high elevation to a low
one. The present paper studies the flow inside a physical model of a tall plunging dropshaft. Visual observations of the
flow inside the dropshaft at several flow rates were obtained using a high-speed camera. The size distributions and
velocities of water drops were measured. Besides, the air pressure variations along the dropshaft were measured. The
water flow inside the dropshaft was found to disintegrate with the majority of the water breaking up into drops of about 2
mm. The drop velocities were also found similar in all tests at a velocity between 4-10 m/s. The air pressure was found to
be negative at the top of the dropshaft and increase towards the bottom of the dropshaft. The results of this study will aid
in the future design of large dropshafts.
File Size : 870,250 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Water engineering
Date Published : 26/08/2015
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