Mass transfer measurements

Yagi and Wakao (1959) used mass transfer measurement results to estimate the heat transfer coefficient at the tube wall. Material was coated on the inner surface of the packed tubes and the dissolution rate was measured. 

Richard S. H. Mah and Mordechai Shacham, Pipeline Network Design and Synthesis J. Robert Selman and Charles W. Tobias, Mass-Transfer Measurements by the Limiting-Current Technique... 

MASS-TRANSFER MEASUREMENTS BY THE LIMITING-CURRENT TECHNIQUE... 

Full development of electrochemical techniques in mass-transfer measurement had to await a quantitative formulation of the role played by convective diffusion in electrode processes, which was successfully provided in... 

In 1971 Mizushina (M9) reviewed the limiting-current method with particular emphasis upon shear-stress and fluid-velocity measurements. Mass-transfer measurements, that is, limiting-current measurements in the original more restricted sense, are documented fairly extensively. The electrochemical analysis of limiting-current measurements is touched upon, but not elaborated. 

The effectiveness of the limiting-current methods for mass-transfer measurement was demonstrated quite early by Tobias and co-workers (W4, W5)... 

An equally important objective of these turbulent mass-transfer measurements was the establishment of the exact dependence of k on the Reynolds number. The well-known empirical Chilton-Colburn equation for turbulent transfer (C3) predicts that... 

To summarize, a comprehensive understanding of turbulent transport is not yet achieved, and information will be needed from optical as well as from further mass-transfer measurements. The latter will have to be made at high Reynolds numbers (> 50,000 in channel flow) and at very high Schmidt numbers (> 10,000) to yield critical information about the transfer process. 

Rao et al. (R7) first made local mass-transfer measurements, by ring electrodes embedded in the perforated plates between which a packed bed was contained. They measured the local mass-transfer rate at ring electrodes... 

A variety of problems encountered with the measurement of oxygen mass transfer coefficients by using the nonsteady state method are well known and well understood. Libra (1993) gives a comprehensive discussion based on oxygen mass transfer measurements. The most important problems are found in the following table. 

Based on these considerations, it is preferable to perform mass transfer measurements using ozone whenever possible. The measurements should be conducted with the same water or waste water and under the same range of operating parameters in which the oxida-... 

With an axisymmetric electrode (like a disk or ring) only y and/or Fr are involved in the mass balance equation. Hence, according to Eq. (2-4) or (2-11) only the F variations are useful for mass transfer measurements. 

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