Estimation of axial dispersion in pulsed-plate extraction columns

Tang, Xiaojin; Chen, Fei; Luo, Guangsheng; Wang, Jiading

doi:10.1016/j.cherd.2009.04.001

Cited by 11 publications

(6 citation statements)

References 10 publications

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“…The mass transfer rate in gas–liquid systems is further enhanced by several techniques such as application of oscillatory motion by either oscillating a stack of plates as in pulsating plate column (Tang et al, 2009) or oscillating the liquid phase as in liquid‐pulsating column (Palma and Giudici, 2003). Although both oscillatory techniques achieve the same objective of creating an oscillatory velocity vector between the plates and the phases, the latter involves accelerating and decelerating the entire liquid mass, which could result in larger pressure fluctuations and energy demand (Gomaa et al, 1991; Gomaa and Al Taweel, 2005).…”

Section: Introductionmentioning

confidence: 99%

Improved gas holdup in novel bubble column

Dhanasekaran

Karunanithi

2011

Can J Chem Eng

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This investigation reports the experimental and theoretical results carried out to evaluate the gas holdup for air-water system in a novel hybrid rotating and reciprocating perforated plate bubble column under countercurrent condition. The response of this hybrid column is found to be similar to that of reciprocating plate column (RPC) showing mixer-settler, transition, and emulsion regions. The effect of agitation level, superficial gas velocity, superficial liquid velocity, perforation diameter, and plate spacing on gas holdup is studied and found to be significant. The gas holdup is found to be least in the range of agitation level of 1.3-1.5 cm/s. For all the superficial gas and liquid velocities considered in this present investigation, the critical agitation level at minimum gas holdup remains nearly same. The gas holdup in this hybrid column is 1.2-1.7 times higher in mixer-settler region and 2.1-2.7 times higher in emulsion region than that of RPC. Correlations have been developed and found to concur with the experimental values. It can be used with 95% accuracy.

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Section: Introductionmentioning

confidence: 99%

Improved gas holdup in novel bubble column

Dhanasekaran

Karunanithi

2011

Can J Chem Eng

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“…U ovom radu [33] su razvijene i korelacije koje se zasnivaju na dimenzionoj analizi i na fizičkom modelu. U radu [34] korišćen je fizički model koji je uzeo u obzir kvantitativne vrednosti koeficijenta aksijalne disperzije u pulzacionoj ekstrakcionoj koloni, vodeći računa o radnim uslovima, geometrijskim parametrima, kao fizičkim karakteristikama eksperimentalnog sistema tečno-tečno. Računski dobijeni rezultati za Ec su se vrlo dobro slagali sa eksperimentalim podacima u devet različitih geometrija ekstrakcionoih kolona.…”

Section: Koeficijent Aksijalne Disperzijeunclassified

“…Računski dobijeni rezultati za Ec su se vrlo dobro slagali sa eksperimentalim podacima u devet različitih geometrija ekstrakcionoih kolona. Model razvijen u ovom radu [34] se pokazao kao vrlo značajan pri projektovanju PEPP kolona. Na bazi poznavanja 992 podataka za 28 sistema tečno-tečno iz 13 različitih izvora, razvijena je korelacija za koeficijent aksijalne disperzije u pulzacionom ekstrakcionim kolonama sa perforiranim podovima [35].…”

Section: Koeficijent Aksijalne Disperzijeunclassified

Hydrodynamics of pulsed sieve-plate extraction columns

Sovilj

Spasojević

2020

Hem Ind

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Izvod U ovom radu se prikazuje pregled istraživanja vezanih za hidrodinamiku pulzacionih ekstrakcionih kolona sa perforiranim podovima (PEPP kolone). Analizirane su eksperimentalne vrednosti nekih hidrodinamičkih parametara, preuzete iz literature, kao što su srednji prečnik kapi, brzina plavljenja, sadržaj dispergovane faze, relativna brzina, kao i koeficijent aksijalne disperzije u sistemima tečno-tečno u ovim ekstrakcionim kolonama. Ovi parametri su značajni pri određivanju hidrodinamike i prenosa mase u ekstrakcionim kolonama , koji su važni u postupku razvoja i poboljšanja strategija u projektovanju pulzacionih ekstrakcionh kolona sa perforiranim podovima kada se pri ekstrakciji uvode novi sistemi tečno-tečno. Poznavanje raspodele i veličine prečnika kapi dispergovane faze su neophodni parametri pri određivanju koeficijenta prenosa mase u ekstrakcionoj koloni, kao i pri merenju efikasnosti same kolone. U ovom radu dat je i pregled istraživanja koja se odnose na uticaj geometrijskih i operativnih parametara kolonskog ekstraktora na osnovne hidrodinamičke karakteristike ekstrakcione kolone. U eksperimentalnim merenjima u literaturi su uočena tri radna režima u pulzacionim ekstrakcionim kolonama, definisana kao: režim mešača-odvajača, disperzioni režim i emulzioni režim.. U radu je analizirana i primena nekih od najznačajnih empirijskih korelacija za određivanje hidrodinamičkih parametara PEPP kolona. Ključne reči: srednji prečnik kapi, brzina plavljenja, sadržaj dispergovane i kontinualne faze, koeficijent aksijalne disperzije, relativna brzina.

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“…23 Apart from a sieve plate, a coalescence dispersion plate has also been used as a column internal. 24 The coalescence dispersion plate is another form of a perforated plate with half-punched surfaces. Xiaojin et al 24 reported a two-phase experimental and numerical study in a coalescence dispersion pulsed sieve plate extraction column.…”

Section: Introductionmentioning

confidence: 99%

Single-Phase Flow Studies Using Radioactive Particle Tracking in an Air-Pulsed Column Having a Novel Plate Internal

Pillajetti,

Gupta,

Goswami

et al. 2023

Ind. Eng. Chem. Res.

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The transport processes in liquid−liquid extraction pulsed columns are significantly influenced by the localized flow field in the column. The localized flow field refers to the local timeaveraged velocity and fluctuations present within the pulsed column. To investigate the microscale flow field in the pulsed column, the radioactive particle tracking technique is employed. The flow characteristics for a single-phase flow are investigated in a pulsed column with a diameter of 75 mm. In this research, a novel slotted plate is employed as an internal component under pulsatile flow conditions. The study focuses on analyzing the single-phase hydrodynamics within the column for a range of pulsation velocities and water flow rates. Various flow parameters are computed for all of the experimental conditions to assess the effectiveness of the slotted plate within the pulsed column. The findings indicate that the pulsing action generates significant fluctuations in velocity, even at low mean flow velocities. Despite the predominance of axial flow velocity in the column, radial motion also plays an important role. The occurrence of overall downward flow reduces axial fluctuations, leading to the decreased axial root-mean-square velocity (RMS) and turbulent kinetic energy compared with those of no net flow. As the water flow increases, both axial and radial RMS velocities become of the same order, resulting in uniform and homogeneous mixing. Consequently, the slotted plate can be an advantageous baffle type for systems with high liquid throughput. The results from this study offer valuable insight into dispersion in both the radial and axial directions in pulsed columns employing slotted plates.

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Estimation of axial dispersion in pulsed-plate extraction columns

Cited by 11 publications

References 10 publications

Improved gas holdup in novel bubble column

Improved gas holdup in novel bubble column

Hydrodynamics of pulsed sieve-plate extraction columns

Single-Phase Flow Studies Using Radioactive Particle Tracking in an Air-Pulsed Column Having a Novel Plate Internal

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