scholarly journals Direct numerical simulation of mass transfer in bidisperse arrays of spheres

AIChE Journal ◽  
2019 ◽  
Vol 66 (1) ◽  
Author(s):  
Jiangtao Lu ◽  
Elias A.J.F. Peters ◽  
Johannes A.M. Kuipers
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Direct Numerical Simulation ◽  
Arrays Of Spheres

Direct Numerical Simulation of Mass Transfer from Spherical Bubbles: the Effect of Interface Contamination at Low Reynolds Numbers

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Adil Dani ◽  
Arnaud Cockx ◽  
Pascal Guiraud
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Direct Numerical Simulation ◽  
Reynolds Numbers ◽  
Solid Sphere ◽  
Creeping Flow ◽  
Spherical Bubbles ◽  
Cap Model ◽  
Liquid Mass Transfer ◽  
Low Reynolds

The gas-liquid mass transfer from bubbles is estimated by Direct Numerical Simulation for fully contaminated bubbles behaving as solid spheres, partially contaminated spherical bubbles and clean spherical bubbles. Partial contamination of bubble interface is accounted by the Stagnant Cap Model to show the effect of the surfactant on hydrodynamic and mass transfer at low Reynolds number. Hydrodynamics results are validated by comparison with other works of the literature. The numerical mass transfer is then analysed in term of local and averaged Sherwood numbers. The comparison of DNS results with classical relations gives the good scaling of Sherwood with Pe1/3 and Pe1/2 respectively for solid sphere and clean bubble in creeping flow. For partially contaminated bubble and after validation of simulated drag coefficient, the effect of the contamination on mass transfer is shown for several Peclet numbers. A correlation for Sherwood number in function of contamination angle is then proposed in creeping flow.

Direct Numerical Simulation of Turbulent Mass Transfer Around a Rotating Stepped Cylinder

2007 ◽  
Author(s):  
Dong-Hyeog Yoon ◽  
Kyung-Soo Yang ◽  
Klaus Bremhorst
Keyword(s):  
Numerical Simulation ◽  
Mass Transfer ◽  
Direct Numerical Simulation ◽  
Low Cost ◽  
Mass Transfer Rate ◽  
Concentration Field ◽  
Immersed Boundary ◽  
Cylinder Surface ◽  
Cylindrical Grid ◽  
Original Motivation

Direct Numerical Simulation was carried out to predict mass transfer in turbulent flow around a rotating stepped cylinder. An immersed boundary method was employed for efficient implementation of the irregular cylinder surface on the cylindrical grid system. This investigation is a follow-up study of Nesic et al. [Corrosion, Vol. 56, No. 10, pp. 1005 – 1014] The original motivation of this work stemmed from the efforts to design a simple device which can generate flows of high turbulence intensity at low cost for corrosion researchers. Two cases were considered; Sc = 1 and 10 both at Re = 335. Here, Sc and Re stand for Schmidt number and Reynolds number, respectively, based on the step height and the surface speed of the cylinder upstream of the step. Characteristics of the averaged concentration field are presented and analyzed. Correlation between the wall-shear stress and the mass-transfer rate is also discussed. The numerical results are qualitatively compared with those of experiments conducted with a similar flow configuration.

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