Abstract
The effect of air inlet geometry on flooding during air–water countercurrent flow in a large diameter vertical tube is studied experimentally. Two different air inlet geometries, i.e. a straight tube inlet and a multi-hole inlet were investigated. The results show that for the same air inlet momentum, flooding may not be achieved with the multi-hole inlet whereas it is observed with the straight tube inlet. The magnitude of air flow rate required to achieve flooding with a multi-hole inlet is considerably greater than that required for a single tube inlet for any given water flow rate. The results further show that the axial velocity decays much faster with a multi-hole inlet as compared to the single tube inlet and thus requires a greater air flow rate to induce flooding.
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