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Thursday, July 9, 2020 | History

2 edition of Drop breakage and mass transfer phenomena in a rotating disc contactor found in the catalog.

Drop breakage and mass transfer phenomena in a rotating disc contactor

Hossein Bahmanyar

Drop breakage and mass transfer phenomena in a rotating disc contactor

a study of breaking phenomena and resulting size distributions for single drops in a rotating disc contactor used for liquid-liquid extraction....

by Hossein Bahmanyar

  • 6 Want to read
  • 15 Currently reading

Published in Bradford .
Written in English


Edition Notes

Ph.D. thesis. Typescript.

SeriesTheses
ID Numbers
Open LibraryOL13861990M

  Previously, several mathematical models have been proposed for liquid–liquid extraction processes involving a rotating-disk-contactor (RDC) column. Most of these models reveal that hydrodynamic and mass-transfer phenomena are important for predicting the performance of the column. In this paper, a mathematical model, using a new scheme, was . A correlation has been proposed for mean drop diameter in a Rotating Sieved Disc Contactor (RSDC) considering drops break up, as well as drops coalescence with static holdup in the case of no mass.

Abstract. Breakage of single drops of solvent in water is examined in a mm diameter RDC. Correlations for drop size distribution and scale up effects obtained from breakage without mass transfer are used to find apparent interfacial tensions for breakage with mass transfer occurring. The rotating disc contactor • The QVF rotary-agitated cell extractor toring of operating phenomena such as drop size, drop breakage etc. The understanding of these drop velocities, drop breakage and mass transfer coefficients which together allow estimation of.

In these contactors new drops are generated from breakage of bigger drops or coalescence of smaller drops The purpose of present work was to investigate the feasibility of the rotating disc contactor for copper extraction from aqueous sulfate solution with hydroxime extractant Cupromex and to obtain information on drop size and hold-up. Experimental investigations carried out in a rotating disc contactor have shown that mean drop sizes are strongly influenced by rotor speed, column height and dispersed phase flow rate when Re R > 10, (Yamaguchi et al., ; Moreira et al., ).


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Drop breakage and mass transfer phenomena in a rotating disc contactor by Hossein Bahmanyar Download PDF EPUB FB2

Drop breakage and mass transfer phenomena in a rotating disc contactor. Author: Bahmanyar, Hossein. ISNI: Awarding Body: University of Bradford Current Institution: University of Bradford Date of Award: Availability of Full Text.

INTRODUCTION A knowledge of drop size distributions work. in liquid-liquid extraction columns is required for proper interpretation of behaviour and for design Drop breakage and coalescence phenomena have to be studied, and the of the mass transfer process established. Drop population influence available.

contactor balances can be written when breakage and coalescence rate functions are This note concerns breakage rates only in a rotating disc Cited by: 1.

A correlation has been proposed for mean drop diameter in a Rotating Sieved Disc Contactor (RSDC) considering drops break up, as well as drops coalescence with static holdup in the case of no mass transfer.

The proposed correlation is a function of a. J.S Ghalehchian, M.J Slater, A possible approach to improving rotating disc contactor design accounting for drop breakage and mass transfer with contamination, Chemical Engineering Journal, /S(99), 75, 2, (), ().Cited by: A comparison between the mass transfer behaviour of a rotating screen disc and a rotating solid disc contactor (RDC) revealed that for a given set of conditions the rate of mass transfer at the rotating screen contactor is higher than that of the rotating disc contactor by a factor of – depending on the operating conditions.

Values of these coefficients were generated from solute concentration profile measurements in a rotary disc contactor (RDC).

The use of the Handlos–Baron drop mass transfer model was justified. The resulting continuous phase transfer coefficients were found to be dependent largely on disc speed. The characterisation of bovine serum albumin (BSA) mass transfer mechanisms in a perforated rotating disc contactor (PRDC) using an aqueous two-phase system (ATPS.

A study of the hydrodynamics and mass transfer characteristics of a liquid-liquid extraction process in a mm diameter, m high Rotating Disc Contactor (R.D.C.) has been undertaken. The literature relating to this type of extractor and the relevant phenomena, such as droplet break-up and coalescence, drop mass transfer and axial mixing has been revjewed.

Rotating Disc Contactor Column 10 Hydrodynamic 12 Terminal Velocity 12 Slip and Characteristic Velocity 13 Drop Breakage Phenomena 14 Drop Size 15 Maximum Drop Size 15 Drop Breakage 16 Critical Drop Size and Critical Rotor Speed 16 Initial Number of Drops 17 Probability of Breakage   High flux mass transfer measurements have been made in a rotating disc contactor and the results compared with model predicted results.

Extraction column and drop model equations for single solute transfer were modified to include the influence of the interphase convective, or drift, flux, previously neglected.

the column geometry, mass transfer direction, temperature and physical properties. For a rotating disc contactor, similar values for C 1 have been found by Chang-Kakoti et al. () and Moreira et al. () for drops of n-butyl alcohol (C 1 = ) and n-heptane (C 1 = ± ) in water, respectively.

More turbulent conditions (Re R >. Observations on the break‐up of single drops in a rotating disc contactor show that there is a critical rotor speed below which drops of a given size do not break.

Weber and Reynolds numbers are required to correlate the data and not simply a Weber number as for turbine agitated systems. Jihong Tong and Shintaro Furusaki, Mean Drop Size and Size Distribution in Rotating Disc Contactor Used for Reversed Micellar Extraetion of Proteins., JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, /jcej, 28, 5, (), ().

Abstract A correlation has been proposed for mean drop diameter in a Rotating Sieved Disc Contactor (RSDC) considering drops break up, as well as drops coalescence with static holdup in the case of. The Interaction of Solute Transfer, Contaminants and Drop Break-up in Rotating Disc Contactors: Part II the Coupling of the Mass Transfer and Breakage Processes via Interfacial Tension.

Can. Chem. Eng.75(6), –[Web of Science ®]. The volumetric overall mass transfer coefficients have been measured in a pilot scale asymmetric rotating disc contactor of mm diameter for the toluene-water-acetone system.

Asymmetric rotating disc contactor (ARDC) offers potential advantages in having comparable mass transfer coefficient (k C a _) and lower back mixing over the conventional rotating disc contactor (RDC).

In the present work, measurements of dispersed phase hold-up (∈ D), effective interfacial area (a _), continuous phase mass transfer. Hossein Bahmanyar and Michael J. Slater, Studies of drop break‐up in liquid‐liquid systems in a rotating disc contactor.

Part I: Conditions of no mass transfer, Chemical Engineering & Technology, 14, 2, (), (). One apparatus liquid–liquid extraction can be carried out in is a counter-current extraction column.

The rotating disc contactor (RDC) is one type of extraction column in which the necessary interface for mass transfer is achieved with rotors placed one.

In this study, the development of an improved forward and inverse models for the mass transfer process in the Rotating Disc Contactor (RDC) column were carried out. The existing mass transfer model with constant boundary condition does not accurately. Oscillations break up internal circulation streamlines and a type of turbulent internal mixing is achieved.

Citing Literature. The application of drop size distribution and discrete drop mass transfer models to assess the performance of a rotating disc contactor, AIChE Journal, /aic, 31, 9.Study of mean diameter and drop size distribution of emulsion drops in a modified rotating disc contactor for an emulsion liquid membrane system.

Lelin Zeng a, Yi Zhang a, Caroline Bukirwa ab, Wensong Li a and Yunquan Yang * a a School of Chemical Engineering, Xiangtan University, Xiangtan City, HunanPR China.Hang Chen, Ze Sun, Xingfu Song, Jianguo Yu, Key Parameter Prediction and Validation for a Pilot-Scale Rotating-Disk Contactor by CFD–PBM Simulation, Industrial & Engineering Chemistry Research, /iew, 53, 51, (), ().