Liquid mixing on bubble-cap and sieve plates

Gilbert, Timothy

doi:10.1016/0009-2509(59)80059-2

Cited by 24 publications

(5 citation statements)

References 19 publications

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“…However, predictions from the De correlation derived by Barker and Self from their static tray were compared to the experimental results. Gilbert (1959) obtained Pe data for both bubble cap and sieve trays. Only his sieve tray results are considered here.…”

Section: April 1991mentioning

confidence: 99%

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Eddy diffusivity for distillation sieve trays

Bennett

Grimm

1991

AIChE Journal

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Section: April 1991mentioning

confidence: 99%

“…These works include Barker and Self (1962), Gilbert (1959), Foss (1957), Shore and Haselden (1969), Porter et al (1977), and Raper et al (1984). In these experiments, dye or salt tracers were introduced close to the inlet or outlet weir, and the upstream (or downstream) tracer concentration profile was measured.…”

Section: Introductionmentioning

confidence: 97%

Eddy diffusivity for distillation sieve trays

Bennett

Grimm

1991

AIChE Journal

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“…His equation, which was based on energy analyses by Azbel (1963) and Kim (1966), is Using Eqs. 5a and 5b, Colwell derived an equation for C1 based on calculations from air/water data of Foss and Gerster (1956), Brambilla et al (1969) and Gilbert (1959 Colwell used Eqs. 5a, 5b and 5c to predict hL and compared these predictions with experimental hL values for a number of data bases.…”

Section: Review Of Other Correlationsmentioning

confidence: 99%

New pressure drop correlation for sieve tray distillation columns

1983

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Pressure drop data for distillation sieve trays have been obtained with experimental trays with small outlet weir heights, including zero, and for trays with small perforations which exhibit large pressure drops due to surface tension. These data have been added to literature data to form a large composite data base with extensive variations in fluid and gas properties, flow rates, and tray designs.A new pressure drop correlation has been developed which retains the use of the dry tray pressure drop, but provides new procedures for estimating liquid inventory and the resistance to vapor flow due to surface tension forces. This correlation gives a mean absolute error of 6.0% and an average error of -0.6%. These errors are significantly less than the errors between measurements and preldictions from two other correlations using the same composite data base. D. L. BENNETT SCOPEPressure drops across distillation column sieve trays should be estimated accurately as part of column designs to determine downcomer backup, column pressure drop, and tray efficiency. These pressure drop calculations become more important in designs for nonfouling service, where small tray spacings are used and flooding limits tray capacity.The objectives of this paper are: a. To determine whether the liquid inventory on a sieve tray can be measured by a tray-mounted manometer, or whether the inventory should be estimated from the total measured pressure drop by subtracting the other pressure drop components.b. To report sieve tray pressure drop data from trays with low outlet weir heights, including zero, and for trays with small perforations which exhibit large surface tension pressure drops.c. To develop a composite data base, consisting of the above data and literature data, which has large variations in fluid and gas properties, flow rates and tray designs.d. To develop a simple pressure drop correlation for sieve trays based on this composite data base, and to compare the accuracy of this correlation with that of several other correlations, using the same data base. CONCLUSIONS AND SIGNIFICANCETray-mounted manometers had been suggested as possible tools for direct measurement of clear liquid head on aerated sieve trays. Time-average measurements made on special trays with fixed liquid inventories showed large discrepancies with known average liquid heads, dependent upon vapor flow rates and clear liquid heads. Therefore, clear liquid heads were determined from total pressure drop measurements from an independent evaluation of surface tension resistance and conventional dry hole pressure drops.Pressure drop data are reported in Table 1 for trays with small weir heights and small perforation sizes. These data were added to literature data to develop a large composite data base with the extensive range of fluid and gas properties, flow rates, and tray designs summarized in Table 2. A pressure drop correlation has been developed using this composite data base. The total pressure drop is assumed to consist of the dry tray component, the liq...

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“…Robinson measured mixing with a salt tracer at fairly low liquid flow rates on a sieve tray and a bubble-cap tray. Gilbert measured mixing with a sieve tray and a bubble-cap tray. This was done by injecting a sodium thiosulfate tracer in a sine wave of different frequencies and measuring the attenuation of the sine wave at the outlet weir with conductivity cells.…”

Section: Introductionmentioning

confidence: 99%

Liquid Back-Mixing on Distillation Trays

Cai

Chen

2004

Ind. Eng. Chem. Res.

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Experimental results are presented on the liquid back-mixing of distillation trays. The tests were conducted in the 1.22 m diameter column of the FRI distillation unit using different systems at various pressures. Both bubble-cap and sieve trays with different designs were tested. For each test, a pulse of nonvolatile dye was injected into the reflux stream and the liquid on several trays was continuously monitored to determine the effects of the trays on this pulse. The degree of liquid back-mixing on the tray was then deduced as a function of the change in the shape of the pulse. The results show that liquid back-mixing is strongly dependent on tray designs and system properties. Certain trays and systems had a high degree of plug flow; others were highly mixed. The test results indicate that the liquid back-mixing occurring in the tray deck is much larger than that in the downcomer. Mixing pool numbers and eddy diffusivity were computed from the experimental data. The results are compared to predictions from several literature models. The predictions from the Bennett et al. and Zuiderweg correlations agree reasonably well with the experimental results.

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Liquid mixing on bubble-cap and sieve plates

Cited by 24 publications

References 19 publications

Eddy diffusivity for distillation sieve trays

Eddy diffusivity for distillation sieve trays

New pressure drop correlation for sieve tray distillation columns

Liquid Back-Mixing on Distillation Trays

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