caa a22 4500 475815084 CHVBK 20180406123807.0 cr unu---uuuuu 170329e20000701xx s 000 0 eng 10.1023/A:1004034807331 doi (NATIONALLICENCE)springer-10.1023/A:1004034807331 An experimental investigation of bubble-induced free convection in a small electrochemical cell [Elektronische Daten] [P. Boissonneau, P. Byrne] The sodium chlorate production process is run in large electrolysers where electrolyte flows between the electrodes due to the natural convection from hydrogen gas evolution. A brief review is given of electrolytic gas generation at electrode surfaces and of previous studies. A small, enclosed rectangular cell was used to electrolyse both a Na2SO4 and a NaCl/NaClO3 solution, in order to produce hydrogen and oxygen bubbles at one or both of the electrodes. The two-phase flow regimes, bubble sizes, gas fraction and fluid velocities between the electrodes were investigated using microscope enhanced visualisation, laser doppler velocimetry and particle image velocimetry. The practicality of each of the measuring methods is analysed and it is concluded that laser doppler velocimetry is the most robust method for measuring such systems. The experimental results are discussed and conclusions are drawn relating gas evolution to the hydrodynamics of electrolyte flowing through a narrow vertical channel. The major conclusions are that fluid flow in systems with bubble evolution can transform from a laminar to a turbulent behaviour, throughout the length of the cell, and that both turbulence and laminar behaviour can exist across the cell channel at the same horizontal plane. Kluwer Academic Publishers, 2000 bubble evolution nationallicence gas evolution nationallicence hydrodynamics nationallicence hydrogen gas nationallicence LDV nationallicence Boissonneau P. Faxén Laboratory, Applied Electrochemistry, Royal Institute of Technology (KTH), Teknikringen 42, SE-100 44, Stockholm, Sweden aut Byrne P. Faxén Laboratory, Applied Electrochemistry, Royal Institute of Technology (KTH), Teknikringen 42, SE-100 44, Stockholm, Sweden aut Journal of Applied Electrochemistry Kluwer Academic Publishers 30/7(2000-07-01), 767-775 0021-891X 30:7<767 2000 30 10800 https://doi.org/10.1023/A:1004034807331 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1004034807331 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Boissonneau P. Faxén Laboratory, Applied Electrochemistry, Royal Institute of Technology (KTH), Teknikringen 42, SE-100 44, Stockholm, Sweden aut NATIONALLICENCE 700 1- Byrne P. Faxén Laboratory, Applied Electrochemistry, Royal Institute of Technology (KTH), Teknikringen 42, SE-100 44, Stockholm, Sweden aut NATIONALLICENCE 773 0- Journal of Applied Electrochemistry Kluwer Academic Publishers 30/7(2000-07-01), 767-775 0021-891X 30:7<767 2000 30 10800 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer