Calculation of Conditions at Which Dryout Occurs in the Serpentine Channels of Fired Reboilers

Chong, L.Y.; Azzopardi, B.J.; Bate, D.

doi:10.1205/cherd.03323

Cited by 11 publications

(3 citation statements)

References 19 publications

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“…On the other 4 hand, Hoang and Davis (1984) reported experimental results of void fraction in froth flow in a 2 inch diameter U-bend using needle probes. Chong et al (2005) calculated the liquid film in 150 mm internal diameter (i.d.) of U-bend and inverted U-bend which was used to join vertical straight pipes to form a serpentine pipeline.…”

Section: Introductionmentioning

confidence: 99%

Gas/liquid flow behaviours in a downward section of large diameter vertical serpentine pipes

Almabrok

Aliyu

Lao

et al. 2016

International Journal of Multiphase Flow

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An experimental study on air/water flow behaviours in a 101.6 mm i.d. vertical pipe with a serpentine configuration is presented. The experiments are conducted for superficial gas and liquid velocities ranging from 0.15 to 30 m/s and 0.07 to 1.5 m/s, respectively. The bend effects on the flow behaviours are significantly reduced when the flow reaches an axial distance of 30 pipe diameters or more from the upstream bend. The mean film thickness data from this study has been used to compare with the predicted data using several falling film correlations and theoretical models. It was observed that the large pipe data exhibits different tendencies and this manifests in the difference in slope when the dimensionless film thickness is plotted as a power law function of the liquid film Reynolds number.

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Section: Introductionmentioning

confidence: 99%

Gas/liquid flow behaviours in a downward section of large diameter vertical serpentine pipes

Almabrok

Aliyu

Lao

et al. 2016

International Journal of Multiphase Flow

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“…Hoang and Davis [9] studied void fraction in froth flow in a 50-mm U-bend by utilising conductance needle probes. James et al [10] investigated droplet behaviour in a 90° horizontal elbow with 67.4 mm diameter while Chong et al [11] derived a model for vertical tubes connected by 180º bends. This was an extension of the phenomenological model for annular flow in a single vertical channel proposed by…”

Section: Introductionmentioning

confidence: 99%

Void fraction development in gas-liquid flow after a U-bend in a vertically upwards serpentine-configuration large-diameter pipe

et al. 2017

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We investigate the effect of a return U-bend on flow behaviour in the vertical upward section of a largediameter pipe. A wire mesh sensor was employed to study the void fraction distributions at axial distances of 5, 28 and 47 pipe diameters after the upstream bottom bend. It was found that, the bottom bend has considerable impacts on up-flow behaviours. In all conditions, contour plots of the crosssectional phase distribution measurement using the wire mesh sensor (WMS) show that centrifugal effect of the U-bend causes appreciable misdistribution in the adjacent straight section. However, flow asymmetry significantly reduces at an axial distance of 47D from the U-bend. Flow regime maps generated from three axial locations showed that, in addition to bubbly, intermittent and annular flows, oscillatory flow occurred particularly when gas and liquid flow rates were relatively low. At this position, the mean void fractions were in agreement with those from other large-pipe studies.Comparisons were made with existing void fraction correlations. Among the correlations surveyed, drift flux-type correlations were found to give the best predictive results.

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“…Indeed, the bend and part of the pipe upstream are sometimes lagged to prevent coking. Chong et al (2005) modelled the mainly annular flow which occurs in these systems. They allowed for evaporation of the film, its depletion by entrainment into drops and its augmentation by drop deposition.…”

Section: Introductionmentioning

confidence: 99%

Liquid film thickness behaviour within a large diameter vertical 180° return bend

Abdulkadir

Aberqi

Zhao

et al. 2014

Chemical Engineering Science

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Calculation of Conditions at Which Dryout Occurs in the Serpentine Channels of Fired Reboilers

Cited by 11 publications

References 19 publications

Gas/liquid flow behaviours in a downward section of large diameter vertical serpentine pipes

Gas/liquid flow behaviours in a downward section of large diameter vertical serpentine pipes

Void fraction development in gas-liquid flow after a U-bend in a vertically upwards serpentine-configuration large-diameter pipe

Liquid film thickness behaviour within a large diameter vertical 180° return bend

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