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Article

Drainage of a Water Tank with Pipe Outlet Loaded by a Passive Rotor

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Imam Mohammad Ibn Saud Islamic University, IMSIU, Riyadh 13318, Saudi Arabia
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Irrigation and Hydraulics Department, Faculty of Engineering, Cairo University, Cairo 12613, Egypt
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Department of Chemical Engineering, National School of Engineers of Gabes, University of Gabes, Gabes 6029, Tunisia
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Irrigation and Hydraulics Department, Faculty of Engineering, Ain Shams University, Cairo 11517, Egypt
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Author to whom correspondence should be addressed.
Academic Editor: Diego Vicinanza
Water 2021, 13(13), 1872; https://doi.org/10.3390/w13131872
Received: 15 May 2021 / Revised: 1 July 2021 / Accepted: 1 July 2021 / Published: 5 July 2021
(This article belongs to the Section Oceans and Coastal Zones)
The optimal design of pipe outlets is an essential objective for many engineering projects. For the first time, this paper reports the results of a laboratory investigation on the effect of using a passive rotor (added at the pipe outlet) on the outlet performance. Different sizes and numbers of blades of rotors were considered. Through the Tracker software package, video and image processing techniques were applied to capture the temporal variations of the tank water depth and the passive rotor’s angular speed. In addition, a normalized average drainage rate (NADR) parameter is defined to quantify the changes in the tank drainage rate as a result of passive rotor utilization. It is noted that adding a 4-bladed symmetric passive rotor will increase NADR by up to 9.0%. The study also shows that the highest increase in NADR is attained when the rotor diameter size is approximately 1.73 times the pipe outlet’s diameter for the case of symmetric 4-blade rotors, and the corresponding average tip rotor speed ratio is 1.65. It is also found that using an asymmetric 3-blade rotor has a negative impact on the NADR due to the significant perturbation produced by the rotor asymmetry. View Full-Text
Keywords: pipe outlet; passive rotor; time of emptying a tank; video tracking in hydraulics; Tracker; mixing; propeller; submerged outfall pipe outlet; passive rotor; time of emptying a tank; video tracking in hydraulics; Tracker; mixing; propeller; submerged outfall
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MDPI and ACS Style

Elgamal, M.; Kriaa, K.; Farouk, M. Drainage of a Water Tank with Pipe Outlet Loaded by a Passive Rotor. Water 2021, 13, 1872. https://doi.org/10.3390/w13131872

AMA Style

Elgamal M, Kriaa K, Farouk M. Drainage of a Water Tank with Pipe Outlet Loaded by a Passive Rotor. Water. 2021; 13(13):1872. https://doi.org/10.3390/w13131872

Chicago/Turabian Style

Elgamal, Mohamed, Karim Kriaa, and Mohamed Farouk. 2021. "Drainage of a Water Tank with Pipe Outlet Loaded by a Passive Rotor" Water 13, no. 13: 1872. https://doi.org/10.3390/w13131872

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