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Pumps and Turbines
Published in Henry Liu, Pipeline Engineering, 2017
An airlift pump consists of a long vertical pipe to convey or lift a liquid (such as water from a well) and a separate vertical pipe to carry compressed air to the bottom of the liquid pipe. By injecting air from the air pipe into the bottom of the liquid pipe, air rises in the liquid pipe and causes the liquid to rise as well. Figure 9.13 shows a typical airlift pump. The main mechanism involved in an airlift pump is the lighter density of the liquid-air mixture in the pipe as compared to the liquid outside the pipe in the reservoir or well.
The hydrodynamic characterization of an oval airlift open pond (AOP) in the air–water system
Published in Chemical Engineering Communications, 2023
Salar Helchi, Farshid Pajoum Shariati, Mir Mehrshad Emamshoushtari, Elnaz Sohani, Mehdi Moayed Mohseni, Babak Bonakdarpour
Then before analyzing the biomass cultivation capacity of the proposed AOP system, the hydrodynamic characterization of the system must be known. This research investigates the cold model hydrodynamic characteristics that are performed in the air–water system of an oval AOP, in which the injected air into the airlift pump provides the driving force for liquid circulation instead of conventional paddlewheels. This feature can also simultaneously provide the O2 or CO2 needed if biomass growth is an option. Moreover, numerous empirical or semi-empirical correlations have been developed to predict gas holdup as a function of designed operating conditions in airlift systems, yet no such correlations have been suggested about AOP therefore, it became the purpose of this study to present gas holdup correlations and determine the effect of superficial gas velocity and ht/hb on gas holdup which ht is the baffle clearance from the top, and hb is the baffle clearance from the bottom along with riser liquid velocity in the proposed AOP system.