Mass transfer of CO2 gas pocket in horizontal pipe flow

Author:

Guo Linjiang1,Fang Lei1,Li Pengcheng23,Ma Yiyi1ORCID

Affiliation:

1. a Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China

2. b Department of Civil and Environmental Engineering, University of Alberta, Edmonton T6G 1H9, Canada

3. c Ecofish Research, Vancouver, Canada

Abstract

ABSTRACT The mass transfer from a stagnant CO2 gas pocket to the flowing water in a horizontal pipe was investigated experimentally, considering the application of pH adjustment by injecting gaseous CO2 for raw water in water treatment industries. In the experiments, the variation of the CO2 gas pocket volume and the corresponding pH values of the pipe flow with time under different conditions were recorded. The mass transfer coefficient of the CO2 gas pocket in the pipe flow was then calculated. The results showed that the injection of gaseous CO2 into the pipe flow could effectively adjust the pH. The volume of the CO2 gas pocket decreased exponentially. Different from most studies on bubble mass transfer, it was found that the ambient CO2 concentration could not be neglected in this study due to the large volume of the gas pocket and the restricted space in the pipe. The mass transfer coefficient increased with the increasing ratio of the CO2 injection rate to the water flow rate and exhibited a sharp reduction as the volume of the CO2 gas pocket decreased by about 80%. The outcomes of this paper can contribute to a better understanding of gas bubble mass transfer in pipe flows.

Funder

Natural Science Foundation of Zhejiang Province

National Natural Science Foundation of China

Key Technologies Research and Development Program

Publisher

IWA Publishing

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