PIV Measurement for Rayleigh Convection and Its Effect on Mass Transfer

Modeling with statistical hydrodynamic quantities of mass transfer across gas–liquid interface with Rayleigh convection

“…In contrast to penetration theory, an obvious increase in the mass transfer coefficient is found to denote the transformation of the mass transfer method from pure molecular diffusion to a combination of diffusion and convection. This finding coincides with the results of previous experiments [5,9,17,18,22,54] that showed that the formation of convection beneath the interface is accompanied by an abrupt increment in the absorption rate. Here, the onset time of…”

“…10~11 and 13~14 in [18]), it can be determined that the mass transfer enhancement factor, i.e., the ratio of the real mass transfer coefficient to that predicted by penetration theory, can be raised up to 5-to 8-fold. Moreover, several scholars [19][20][21][22] conducted separate investigations focusing on mass transfer with natural convection and obtained empirical correlations for the mass transfer coefficient. In these correlations, the dimensionless Sh number is typically assumed to be correlated with the Ra number.…”

“…Fortunately, progress is being made with the recent development of nonintrusive measurement techniques and powerful numerical simulation schemes. Chen et al [22] performed the particle image velocimetry (PIV) measurement for the velocity field in Rayleigh convection. Fu et al [24] employed a two-equation LBM in the computational solution of velocity and concentration fields of Rayleigh convection, and an experimental measurement of the velocity field was conducted via PIV.…”

Pore-scale study based on lattice Boltzmann method of density driven natural convection during CO2 injection project

“…The spectral method has been used to generate permeability heterogeneity fields. Chen et al investigated experimentally the velocity distribution in Rayleigh convection in the gas-liquid mass transfer of acetone volatilization in acetone-ethyl acetate binary system via particle image velocimetry (PIV) [12].…”

“…The density difference, which was assumed to vary linearly with the concentration difference caused by the mass transfer, is the only source [18]. In this problem, the exerted body force can be written as 00 C      g g g (12) where  is the saline aquifer density, 0  is the density of pure water, and  is the expansion coefficient, which is defined as…”