Bubble swarm characteristics in bubble columns

Kumar, Akhilesh; Degaleesan, T. E.; Laddha, G. S.; Hoelscher, H. E.

doi:10.1002/cjce.5450540525

Cited by 51 publications

(13 citation statements)

References 15 publications

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“…The bubble size is now about twice the size of the orifice [Wallis ( 1969)l. Kumar et al (1976) and Bhavaragu et al (1978) report correlations containing orifice dimensions for the bubble size. Also Voigt and Schugerl (l979), Kato and Nishiwaki (1972), Zuber and Hench (1962) and Bach and Pilhofer (1978) found an influence of orifice size.…”

Section: Systemmentioning

confidence: 99%

A correlation for gas holdup in turbulent coalescing bubble columns

et al. 1986

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A review of existing literature for the purpose of comparing correlations which allow Lhe explicit predictim @ gas holdup in twoor three-phase bubble columns shows wide disagreement concerning the eTfegt. of various variables. Further, various correlations, apparently of equal validity, show equally wide disagreement in the Fiadicted absolute values of gas holdup among three test systems; water-air, hydrocarbon solvent-air, and trichloroethyrene air. Some possible reasons for these disagreements are discussed.Extensive gas holdup data obtained in a 0.30 m diameter column for the three test systems were correlated statisticany for the transition and the turbulent region. The resulting correlation gives agreement with experiment to within *20%, with most data showing * 10% agreement. The proposed correlation was also tested against thirteen data sets (from eight researchers) which corresponded to its region of validity and gave good agreement. Three additional relevant data sets were not satisfactorily predicted.On a prockdk Ir une ktude bibliographique dans le but de comparer des corrklations permettant de prkdire explicitement la ktention des gaz dans des colonnes a bulles deux ou trois phases et on a montrk que ces codlations ne s'accordent pas sur I'effet des diffkrentes variables. De plus, diverses codlations, apparernment de mkme validitk, montrent kgalement un dksaccord dans les valeurs absolues prkdites pour la ktention des gaz dans le cas de trois systbmes-tests: eau -air, solvant a base d'hydrocarburesair et trichlokthylbneair. On analyse quelques raisons pouvant expliquer I . Air-Water Air-Glycol aq. soh. Air -Methanol 02-Water 2. Air-Alcohols Air-Halogenated Hydrocarbons 3. Air-Water Air-Glycerol, aq. soln. Air-Kerosene 4. (Air, H2, C02, CH4, C3Hw, N2) -Water Air -Organic Liquids Air-Electrolyte soln. U,, m/s 0.003 -0.4 UL, m/s 0 -0.044 D, rn 0.152 -0.6 H , m 1.26 -3.5 Single nozzle sparger d,,, rn 0.005 C = 0.2 for pure liquids and non-electrolyte mixtures Akita and Yoshida (1973) U,. m/s 0 -0.2 D, rn 0.1 H , rn > 1.2 Perforated plate d,,, rn 0.0005, 0.001 U,, rn/s 0.0014 -0.14 D, m 0.05, 0.07, 0.10 Perforated plate d,,, m 0.00087 -0.00309 Bach and Pilhofer (1978) Ex -= 0.115[ I -E, E , = 0.72! U -0.485 U z + 0.0975 U 3 u = U G [ p L / u ( p L -PO)^]''^ Kurnar et al. (1976) M = 21-49 u, pL 0 5 7 8 U,, m/s 0.012 -0.38 D, rn 0.1

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Section: Systemmentioning

confidence: 99%

A correlation for gas holdup in turbulent coalescing bubble columns

et al. 1986

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“…Phase interactions in gas-liquid, gas-solid and gas-liquid-solid systems have been the subject of numerous experimental and theoretical investigations (e.g., Kumar et al, 1976;Kato et al, 1976;Begovich and Watson, 1978;Hikata et al, 1980;Friedel et al, 1980;Kato et al, 1982). Phase interactions arising in gas-liquid-liquid systems, however, have received comparatively little attention, even though such three-phase systems can arise in hydrorefining processes , pyrometallurgical processes such as copper convertors and the head boxes for continuously caste steel, and electro-organic synthesis.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of gas‐agitated liquid‐liquid dispersions

et al. 1990

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Gas-agitated liquid-liquid dispersions arise in applications as diverse as direct hydrogenation processes for bitumen and coal, and the manufacture of iron and steel. The transfer of gas-phase constituents to the dispersed liquid phase and /or elution of dispersed-phase drops have been identified as potential limiting phenomena in these processes. Consequently, mean drop size and drop size distribution are key design variables. In this paper, the impact of gas flux and the physical properties of dispersed-phase constituents on the steadystate size distribution of liquid drops in lean liquid-liquid dispersions is quantified. The physical properties of the dispersed phase are shown to have a significant impact on drop size and drop-size distribution at low gas fluxes. Sauter mean drop size is correlated using theoretical models for drop break-up and coalescence. All results are compared with stirred tank analogues.

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“…The air holdup data for the air-water system taken under comparable operating conditions for the seven-tube bundle have been examined on the basis of correlations due to Reilly et al (1986), Sada et al (1984), Hikita et al (1980), Smith et al (1984, Kumar et al (1976), Grover et al (1986) and Zou et al (1988) by Saxena et al (1990) with limited success only. We will therefore discuss here only a comparatively more successful approach based on Nicklin's (1962) work employing the concept of drift velocity, U, .…”

Section: Discussionmentioning

confidence: 99%

Heat transfer and gas holdup studies in a bubble column: Air‐water‐sand system

1992

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Air-holdup and heat transfer coefficient data are reported for the air-water and air-water-sand system as a function of air velocity in the temperature range 297-343 K as measured in a 0.305 m diameter bubble column operating in semi-batch mode and equipped with either a five-or seven-tube bundle. A 65 p n average size sand powder is used at concentrations of 5 and 10 mass percent in the slurry. Available correlations of gas holdup and heat transfer coefficients are examined on the basis of these data. These are found inappropriate and inadequate for representing these experimental data. Gas holdup data are well represented by an approach based on Nicklin's (1962) work, and heat transfer data are adequately represented by a simple semi-empirical expression. Accurate experimental data on additional systems are needed to develop a reliable heat transfer theory particularly for process representation at temperatures higher than ambient. ~~~~ ~ ..~ ~~On presente des donntes sur la rktention d'air et le coefficient de transfert de chaleur pour les systemes air-eau et air-eau-sable en fonction de la vitesse de I'air B des temperatures comprises entre 297 et 343 K telles qu'elles ont @ t i mesurees dans une colonne de 0,305 m de diambtre fonctionnant en mode semi-discontinu et munie d'un faisceau de cinq ou sept tuyaux. Du sable trbs fin d'un diambtre moyen de 65 gm a CtC utilisC i des concentrations de 5 zt 10 pour cent en masse dans la suspension. Des corrklations existantes sur la rCtention du gaz et le coefficient de transfert de chaleur ont Ctt examintes a partir de ces donntes. On a trouvt qu'elles Ctaient inappropriCes et inadCquates pour reprtsenter les donnCes exPCrimentales. II est possible de bien repisenter les donnCes de rCtention de gaz en utilisant une mCthode s'appuyant sur le travail de Nicklin (1962); les donnees sur le transfert de chaleur sont quant 1 elles bien representees par une expression semi-einpirique simple. Des donnCes experimentales prCcises sur d'autres systems sont nkcessaires pour mettre au point une theorie du transfert de chaleur fiable, en particulier pour la representation des proctdCs i des tempkratures plus ClevCes que la tempCrature ambiante.

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Bubble swarm characteristics in bubble columns

Cited by 51 publications

References 15 publications

A correlation for gas holdup in turbulent coalescing bubble columns

A correlation for gas holdup in turbulent coalescing bubble columns

Hydrodynamics of gas‐agitated liquid‐liquid dispersions

Heat transfer and gas holdup studies in a bubble column: Air‐water‐sand system

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