Effect of gas sparging on the rate of mass transfer at a single sphere

Radial mass-transfer enhancement in bubble-train flow

“…For example, Zarraa et al [47] studied mass transfer to a single sphere under gas sparging and Patil and Sharma [46] examined mass transfer in bubble columns with the aid of copper dissolution. In the absence of a reliable theoretical frame of reference, no deviation from theory could be detected and it thus remains unclear, whether mixed convection influenced their results or not.…”

“…In the four decades since the original publication, considerable experience in using the system has been documented in the literature and the key-parameters of the system, such as the diffusion coefficient of the dichromate ion appeared well established [38,46,47,48]. By contrast, the latter method still suffers from uncertainties in this respect, as Poulson and Robinson report themselves.…”

Mass Transfer Characteristics during the Removal of Dissolved Heavy Metals from Waste Solutions in Gas Sparged Fluidized Beds of Ion Exchange Resins

“…It is notable that the dependence of the mass transfer coefficient on particle diameter to the power of ±0.62 is fair agreement with value (±0.5) predicted from the hydrodynamic boundary layer theory in the case of single-phase flow [30]. An overall correlation was envisaged using the dimensionless groups J, Fr and Re, usually used in correlating heat and mass transfer in gas-sparged systems [18,19,31,32].A dimensionless correlation in the form: J = a(Fr Re) b which is usually used in correlating heat and mass transfer in bubble columns was found insufficient for the present data; two extra dimensionless groups were found necessary, namely d …”

Effect of Gas Sparging on the Rate of Mass Transfer at Horizontal Cylinders

“…(10)(11)(12) show the effect of the cylinder diameter on the mass transfer coefficient, the data fit the equations: An overall mass transfer correlation of the data was envisaged using the method of dimensional analysis. For single gas sparged horizontal cylinder, the mass transfer coefficient can be related to other variables by the following functional equation:…”

“…Since then, gas sparging has been used to enhance the rate of liquid-solid mass transfer at vertical cylinder electrodes [4], fixed bed electrode [5], vertical bubble column [6], horizontal and vertical screens [7][8][9]. Zarraa et al [10,11] studied the effect of N 2 sparging on the rate of mass transfer at a single sphere and a fixed bed of spheres using the diffusion controlled dissolution of copper in acidified K 2 Cr 2 O 7 . Noseir et al [12] studied the effect of nitrogen sparging on the rate of mass transfer at a fixed bed of Raschig rings under different conditions of bed height, physical properties of the solution, ring diameter.…”