Abstract
The local rate of mass transfer to a convex cylindrical surface from an unsubmerged impinging jet was obtained by measuring the mass‐transfer limiting current of the reduction of ferricyanide ions on a sectioned electrode. The effects of flow rate, nozzle height, and radius of curvature of the impinged surface were investigated. The wall‐shear stress and liquid‐film thickness were also measured. The results indicate that the influence of nozzle height and surface curvature on the local mass transfer rate were relatively minor. The relationship between the local Sherwood number (Sh) and the nozzle Reynolds number (Re) can be expressed aswhere is the nozzle width, and is the surface distance from the point of impingement. The value of exponent β was found to be equal to 0.6 in the impingement regime for and in the wall jet regime for . When the Reynolds number became greater than 6000, the value of β in the wall jet regime increased to . The function was of a polynomial type exhibiting two maxima and one minimum within the range investigated.
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