Mass transfer in upwards co-current gas-liquid annular flow

Hydrodynamics and mass transfer characteristics in gas–liquid flow through a rectangular microchannel

“…It is shown that when the microchannel is operated under these flow patterns, k L a value increases significantly with the increasing j L and j G , which is similar to mass transfer behavior generally observed in minichannels with d h 1 mm (Luo and Ghiaasiaan, 1997;Tortopidis and Bontozoglou, 1997;Vandu et al, 2005). It is commonly accepted that liquid side volumetric mass transfer coefficients in large pipes can be well correlated with the energy dissipation parameter ε (Jagota et al, 1973;Jepsen, 1970;Tortopidis and Bontozoglou, 1997), defined as ε = P F L T P (j G + j L ).…”

Hydrodynamics and mass transfer characteristics in gas–liquid flow through a rectangular microchannel

“…It is shown that when the microchannel is operated under these flow patterns, k L a value increases significantly with the increasing j L and j G , which is similar to mass transfer behavior generally observed in minichannels with d h 1 mm (Luo and Ghiaasiaan, 1997;Tortopidis and Bontozoglou, 1997;Vandu et al, 2005). It is commonly accepted that liquid side volumetric mass transfer coefficients in large pipes can be well correlated with the energy dissipation parameter ε (Jagota et al, 1973;Jepsen, 1970;Tortopidis and Bontozoglou, 1997), defined as ε = P F L T P (j G + j L ).…”

Gas to liquid mass transfer in rheologically complex fluids

“…However, the analogy is limited since gravity leads to a non-symmetric flow pattern in horizontal pipes while axisymmetric flow pattern can be considered in vertical systems [34]. Besides, the slugs formed in pseudo-slug flow in horizontal pipes tend to have a temporal nature [36], while slugs observed in this study travelled the majority of the column height without significant disturbances.…”

“…Annular regime has previously been described for vertical tubes [35]. However, the gas phase was previously envisaged as continuous and the liquid as partly dispersed [34]. The new slug-annular flow described in this study is characterised by liquid occupying the entire column but being divided into two separate regions: outer stagnant annulus and liquid contained in the centre of the column, being the latest disturbed only by ascendant slugs of gas (Fig.…”

“…7) were effectively stabilised by the non-mixed fluid in the outer annulus, which appeared to apply a dragging force imitating a wall effect. The slugannular flow found in this study partly resembles the pseudo-slug flow described in horizontal pipes, where a continuous liquid film is formed on the pipe wall and slugs touching the top of the pipe are only formed occasionally, being the gas stream normally confined within the pipe´s core [34,35].…”

Finite element analysis of a bubble absorber

“…Therefore, numerical investigations are essential for a thorough understanding.In the vertical tubular bubble absorber, the weak solution is supplied at the lower end of an array of tubes and the gas which bubbles into the solution is absorbed gradually and the concentrated solution is obtained at the upper end of the tubes. The heat of absorption is removed by circulating coolant.Several investigators (Jagota et al, 1973;Kasturi and Stepanek, 1974; Shilimkan and Stepanek, 1977) have experimentally studied cocurrent mass transfer in horizontal as well as vertical tubes. Kouremenos et al…”

Hydrodynamics and mass transfer characteristics in gas–liquid flow through a rectangular microchannel

“…It is shown that when the microchannel is operated under these flow patterns, k L a value increases significantly with the increasing j L and j G , which is similar to mass transfer behavior generally observed in minichannels with d h 1 mm (Luo and Ghiaasiaan, 1997;Tortopidis and Bontozoglou, 1997;Vandu et al, 2005). It is commonly accepted that liquid side volumetric mass transfer coefficients in large pipes can be well correlated with the energy dissipation parameter ε (Jagota et al, 1973;Jepsen, 1970;Tortopidis and Bontozoglou, 1997), defined as ε = P F L T P (j G + j L ).…”

Gas to liquid mass transfer in rheologically complex fluids

“…However, the analogy is limited since gravity leads to a non-symmetric flow pattern in horizontal pipes while axisymmetric flow pattern can be considered in vertical systems [34]. Besides, the slugs formed in pseudo-slug flow in horizontal pipes tend to have a temporal nature [36], while slugs observed in this study travelled the majority of the column height without significant disturbances.…”

“…Annular regime has previously been described for vertical tubes [35]. However, the gas phase was previously envisaged as continuous and the liquid as partly dispersed [34]. The new slug-annular flow described in this study is characterised by liquid occupying the entire column but being divided into two separate regions: outer stagnant annulus and liquid contained in the centre of the column, being the latest disturbed only by ascendant slugs of gas (Fig.…”

“…7) were effectively stabilised by the non-mixed fluid in the outer annulus, which appeared to apply a dragging force imitating a wall effect. The slugannular flow found in this study partly resembles the pseudo-slug flow described in horizontal pipes, where a continuous liquid film is formed on the pipe wall and slugs touching the top of the pipe are only formed occasionally, being the gas stream normally confined within the pipe´s core [34,35].…”

Finite element analysis of a bubble absorber

“…Therefore, numerical investigations are essential for a thorough understanding.In the vertical tubular bubble absorber, the weak solution is supplied at the lower end of an array of tubes and the gas which bubbles into the solution is absorbed gradually and the concentrated solution is obtained at the upper end of the tubes. The heat of absorption is removed by circulating coolant.Several investigators (Jagota et al, 1973;Kasturi and Stepanek, 1974; Shilimkan and Stepanek, 1977) have experimentally studied cocurrent mass transfer in horizontal as well as vertical tubes. Kouremenos et al…”

Hydrodynamics and mass transfer characteristics in gas–liquid flow through a rectangular microchannel

“…It is shown that when the microchannel is operated under these flow patterns, k L a value increases significantly with the increasing j L and j G , which is similar to mass transfer behavior generally observed in minichannels with d h 1 mm (Luo and Ghiaasiaan, 1997;Tortopidis and Bontozoglou, 1997;Vandu et al, 2005). It is commonly accepted that liquid side volumetric mass transfer coefficients in large pipes can be well correlated with the energy dissipation parameter ε (Jagota et al, 1973;Jepsen, 1970;Tortopidis and Bontozoglou, 1997), defined as ε = P F L T P (j G + j L ).…”

Gas to liquid mass transfer in rheologically complex fluids

“…However, the analogy is limited since gravity leads to a non-symmetric flow pattern in horizontal pipes while axisymmetric flow pattern can be considered in vertical systems [34]. Besides, the slugs formed in pseudo-slug flow in horizontal pipes tend to have a temporal nature [36], while slugs observed in this study travelled the majority of the column height without significant disturbances.…”

“…Annular regime has previously been described for vertical tubes [35]. However, the gas phase was previously envisaged as continuous and the liquid as partly dispersed [34]. The new slug-annular flow described in this study is characterised by liquid occupying the entire column but being divided into two separate regions: outer stagnant annulus and liquid contained in the centre of the column, being the latest disturbed only by ascendant slugs of gas (Fig.…”

“…7) were effectively stabilised by the non-mixed fluid in the outer annulus, which appeared to apply a dragging force imitating a wall effect. The slugannular flow found in this study partly resembles the pseudo-slug flow described in horizontal pipes, where a continuous liquid film is formed on the pipe wall and slugs touching the top of the pipe are only formed occasionally, being the gas stream normally confined within the pipe´s core [34,35].…”

Finite element analysis of a bubble absorber

“…Therefore, numerical investigations are essential for a thorough understanding.In the vertical tubular bubble absorber, the weak solution is supplied at the lower end of an array of tubes and the gas which bubbles into the solution is absorbed gradually and the concentrated solution is obtained at the upper end of the tubes. The heat of absorption is removed by circulating coolant.Several investigators (Jagota et al, 1973;Kasturi and Stepanek, 1974; Shilimkan and Stepanek, 1977) have experimentally studied cocurrent mass transfer in horizontal as well as vertical tubes. Kouremenos et al…”