Mass Transfer in a Rotating Packed Bed with Viscous Newtonian and Non-Newtonian Fluids

Abstract

A theoretical analysis was developed to predict the apparent viscosity of a non-Newtonian fluid in a rotating packed bed. It is based on laminar liquid film flow on a rotating disk with the assumption of the randomly inclined surfaces in the rotating packed bed. In addition, experiments of deoxygenation were performed in glycerol solutions and CMC solutions, which are Newtonian and shear-thinning fluids, respectively. It is shown that mass transfer coefficients decreased with increasing viscosity, while the centrifugal force still revealed effective in enhancing mass transfer in viscous media. A correlation for mass transfer coefficient was proposed and valid for both the Newtonian and non-Newtonian fluids. Compared with a packed column, the influence of mass transfer coefficients by liquid viscosity was less in a rotating packed bed.

A new diffusion for laminar boundary layer flow of power law fluids past a flat surface with magnetic effect and suction or injection

“…Eldabe et al [10] studied the thermal-diffusion and diffusion-thermo effects on mixed free-forced convection and mass transfer boundary layer flow for non-Newtonian fluid with temperature dependent viscosity by the aid of Chebyshev finite difference method. Later, Chen et al [11] developed a theoretical analysis to predict the apparent viscosity of laminar non-Newtonian liquid film in a rotating packed bed. It was shown that mass transfer coefficients decreased with increasing viscosity, while the centrifugal force still revealed effective in enhancing mass transfer in viscous media.…”

Evaluation of alkanolamine solutions for carbon dioxide removal in cross-flow rotating packed beds

“…Therefore, the gas-liquid mass transfer would frequently be enhanced by a factor of 10-100 and the dramatic reduction in the equipment volume would be achieved, thereby reducing the capital and operating costs [5]. A variety of studies have appeared in which the attention was focused on the applications of the countercurrent-flow RPB in diverse processes such as distillation [6][7][8][9][10][11], absorption [12][13][14][15][16][17][18][19][20][21][22][23][24][25], stripping [26][27][28][29][30], deaeration [31][32][33][34][35], reactive precipitation [36][37][38][39][40][41][42][43][44][45][46][47], and ozone oxidation [48][49][50][51]…”

Feasibility of ozone absorption by H2O2 solution in rotating packed beds

“…Therefore, the size of the RPB would be dramatically reduced and, thus, the capital and operating costs would be reduced simultaneously [5]. The RPB can be used to enhance the O 3 transfer from gas phase to liquid phase based on the studies, which presented that the RPB has a wide applicability in a variety of gas-liquid contacting processes such as distillation [6,7], absorption [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], stripping [24][25][26][27], deaeration [28][29][30][31][32], reactive precipitation [33], and ozone oxidation [34][35][36][37].…”