Air lift pump
2019 – 2020
Supervised by:
أ.د. صادق كساب
By:
محمود أحمد محمد عبد الرحمن سرور
Abstract
Air-lift pumps are finding increasing use where pump reliability and low maintenance are required, where corrosive, abrasive, or radioactive fluids in nuclear applications must be handled and when a compressed air is readily available as a source of a renewable energy for water pumping applications. The objective of the present study is to evaluate the performance of a pump under predetermined operating conditions and to optimize the related parameters. For this purpose, an air-lift pump was designed and tested. Experiments were performed for nine submergence ratios, and three risers of different lengths with different air injection pressures. Moreover, the pump was tested under different two-phase flow patterns. A theoretical model is proposed in this study taking into account the flow patterns at the best efficiency range where the pump is operated. The present results showed that the pump capacity and efficiency are functions of the air mass flow rate, submergence ratio, and riser pipe length. The best efficiency range of the air-lift pumps operation was found to be in the slug and slug-churn flow regimes. The proposed model has been compared with experimental data and the most cited models available. The proposed model is in good agreement with experimental results and found to predict the liquid volumetric flux for different flow patterns including bubbly, slug and churn flow patterns. Air lift pump performance is investigated experimentally using different air lift riser arrangements and injection device with different size. An air lift pump is designed and tested for this purpose. The air lift pump is operating in air-water two phase flows. Four different riser arrangements designs were used with the same air injection method under different air pressures. These riser arrangements are: 1/4 of the riser length of 50.8mm diameter with the rest of the riser length of 25.4mm diameter, on the same concept 2/4 of the riser,3/4 and 4/4 model.
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