Electrochemical measurements of mass transfer in a turbulent pipe flow are presented. In particular the effect of flow obstacles, such as orifices and circumferential slots with varying diameter and axial length, has been studied. The results also include measurements of mass transfer downstream, a sudden expansion or reduction of the tube diameter. The experiments were performed at a Schmidt number of 1460 and Reynolds numbers ranging between
1·104
and
3·105
. The work presented in this paper is a part of a project aiming to study the relation between corrosion and mass transfer at high flow rates with particular emphasis on disturbed turbulent pipe flow.
X‐ray diffraction analyses have been performed on samples of electrolytic copper (min. 99,9% Cu) exposed to humid atmoshperes at SO2‐supplies of 10 and 100μg SO2 per cm2 surface area per hour (10 and 100 ppm SO2. respectively). During the SO2 ‐exposures copper (II) sulphate (CuSO4 · 5 H2O) were the only crystalline phases formed in detectable amounts. Interruption of the SO2‐ supply resulted in the formation of copper (I) oxide and antlerite (CuSO4) · 2Cu (OH)2. During prolonged exposure brochanite (CuSO4 · 3Cu(OH)2) and langite (CuSO4· 3Cu(OH)2) and langite (CuSO4 · Cu(OH)2 · 2H2O) were also formed i. E. the Cu:S ratio of the basic copper sulphates increased with time. The formation of antlerite was preceeded by formation of an unidentified intermediate compound, probably a basic copper sulphate with a Cu:S ratio of less than three, and a simultaneous transformation of the copper (II) sulphate and copper (I, II) sulphite formed during the SO2‐exposure.
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