Distribution of local mass transfer coefficients over one electrode bombarded by submerged multijets of electrolyte

Local Mass Transfer Coefficients at Walls Impinged by Unsubmerged Multijets Issued from Very Porous Distributors

“…10. In spite of the disagreement between the powers of ~, one sees that correlations [11] and [12] are in satisfactory quantitative agreement with our experimental results, especially if it is remeIhbered that multijets are concerned.…”

“…It has to be noted that the general aspect of the radial distributions of kd is approximately the same for the three distributors; however, distributor M45, which uses nickel foam, generates a distribution more uniform that of the other distributors and also nearly identical along both radii, R1 and Rz. For distributors MC7 and MH7, the deviations between the extrema of k d are small if compared with the deviations ob- served in (12) for values of Af smaller than 4%. Figure 3(b) compares distributions obtained with three distributors for a given injection flow rate and then for different injection Reynolds numbers Reo; as Reo is not a very influent parameter [ Fig.…”

“…The local values of the mass transfer coefficient and of the shear stress on the solid surface receiving the jet were obtained, as in other works (4,12,19), using microelectrodes. Let us recall that this electrochemical technique is based on the insertion in the transfer surface of judiciously distributed microelectrodes isolated from that surface by a thin layer of araldite [see detail of Fig.…”

Overall Mass Transfer Between a Solid Surface and Submerged or Unsubmerged Liquid Multijets

“…1, previously given in Ref. (5), shows such structures. As a result of the interactions between jets, there is a nonuniform spatial distribution of local mass-transfer coefficients (5) contrary to previsions.…”

“…In a previous work mean and local mass-transfer coefficients to circular electrodes impinged by circular multijets of liquid were measured (4,5); the cylindrical holes of the distributors were arranged in a square pattern. The mean mass-transfer coefficients presented high values, but their general correlation was not possible owing to the numerous parameters (jet diameter, distance between jets, exit velocity of the jet, etc.)…”