الفهرس 
Chapter 1 : IntroductionOnly 14 pages are availabe for public view
 |  | from | 253 |  |  |
| | | from | 253 | | |
Abstract
1- Owing to the superiority of the RDCs both in structure and experimental method, development of research in this field is very attractive. The RDCs can be used to
agreerrent with the existence of a plateau region for Vk at low agitation
4- Th~ characteristic velocity can be related to DROP size, rotor speed, geometry,
7- There are many correlations for predicting the terminal velocity but the correlation of Grace (15178) seems suitable for correlating present experimental results.
7.2 Mass transfcx c.onclusions
1- The first conclusion with respect to mass transfer characteristics of the Kuhni columns is that the amount of research done is not enough to attempt a reliable design without a previous investigation of the problems at a pilot plant scale.
2- The model developed in the previous work at University of Bradford (Slater 1995) was tested and found to work well to correlate the continuous phase mass transfer coefficients of single DROPs. A small but significant enhancement of the continuous phase film mass transfer coefficient for single DROPs is achieved due to agitation.
3- Equations are proposed for describing liquid and DROP side mass transfer coefficients for vertically moving DROPs subject to contamination (equations 6.2, 6.3 and 6.4). These are used to find an enhancement factor due to agitation and down flow of the continuous phase for Roes.
4- Single DROP experimental evidence shows that the contamination factor obtained with the combined film mass transfer model varies with time and DROP size.
5- Increasing the rotor speed produces more agitation therefore giving higher DROP residence times and larger overall mass transfer coefficient.
6- The overall enhancement of mass transfer due to agitation and down flow of the continuous phase is significant (for both Kod and kc ) and has to be accounted for in design calculations.
7- The experiments have been carried out under conditions that the DROP does not break and at low Reynolds value compared to industrial operations, therefore the results must be treated with understanding since many DROPs are broken in the columns.
8- Previous work on the DROP side mass transfer coefficient can now be used with present results and incorporated into a model for the effect of rotor speed on the overall mass transfer coefficients.