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1. Milivojević Milan. Liquid velocity in a three and two phase external loop airlift reactors.

Degree: PhD, Technology and Metallurgy, 2011, University of Belgrade

In this paper, the influence of the geometry and the presence of the solid phase on the hydrodynamics of three-phase pneumatic reactor with external recirculation were theoretically and experimentally examined. Tests were experimentally performed on nine geometrically different rectors and theoretically on four more reactors for which data were available in the literature. Influences of following hydrodynamic parameters on liquid velocity were examined: the area ratio of riser and downcomer section Ar /Ad; diameter and height of the riser section; geometry (length) of the gas separating section; fluid level in gas separating section; portion, size and density of particles; overall reactor geometry. Besides, the effect of the presence and quantity of particles to changes in flow regime were examined, as well as the minimum speed required for recirculation of particles. Detailed theoretical analysis of the impact of total resistance to flow on the liquid velocity was also performed. Maximum liquid velocities were in the reactors with larger heights and larger diameters and with shorter side parts. Also, the liquid velocity is higher in the reactors with equal diameters of riser and downcomer while smallest velocities were in the reactors with Ar/Ad greater than one. Tests have shown that the height of the rector directly affects the liquid velocity through the factor k and reactor diameter affects it not directly but only by changing the total resistance. This effect is more pronounced at low gas velocities and for the two-phase systems. It was found, by the analysis of the total resistance, that from the standpoint of reducing overall resistance it is better to increase the scale of the reactor (total volume) by increasing the diameter of the reactor rather than by increasing the height. Liquid velocity in the reactors is directly proportional to the values of the geometric parameter k so that the velocity increases with decreasing values of this parameter. It was determined that a change in flow regime is also determined by the value of this parameter. This shows that modeling of ALR is impossible without including the influence of reactor geometry through this parameter. Effect of the particles in the system as well as their density and diameter was also examined. The effect of reactor geometry on the slip speed was also examined. A detailed analysis of the slip rate in the different reactors has given phenomenologically a whole new equation for prediction of the slip velocity in homogeneous and heterogeneous regime. The proposed model is among the most accurate and the only one that include an impact of reactor geometry on the slip velocity. Detailed analysis of the conditions under which ALR achieved so-called recirculation mode showed that the rate of gas needed for this mode is linearly proportional to the percentage of the particles and also depends on the reactor geometry. It is shown that the geometry and the liquid level in the gas separator have a very strong impact on the liquid velocity. Liquid velocity…

Subjects/Keywords: airlift reactor; external circulation; tree-phase systems; liquid welocity; reactor geometry; slip velocity; alginate beads; pneumatski reaktor; spoljašnja recirkulacije; trofazni sistemi; geometrija reaktora; brzina tečnosti; slip brzina; alginatne čestice

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APA (6th Edition):

Milan, M. (2011). Liquid velocity in a three and two phase external loop airlift reactors. (Doctoral Dissertation). University of Belgrade. Retrieved from http://dx.doi.org/10.2298/BG20110318MILIVOJEVIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=914 ; https://fedorabg.bg.ac.rs/fedora/get/o:7437/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=40683791

Chicago Manual of Style (16th Edition):

Milan, Milivojević. “Liquid velocity in a three and two phase external loop airlift reactors.” 2011. Doctoral Dissertation, University of Belgrade. Accessed October 21, 2019. http://dx.doi.org/10.2298/BG20110318MILIVOJEVIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=914 ; https://fedorabg.bg.ac.rs/fedora/get/o:7437/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=40683791.

MLA Handbook (7th Edition):

Milan, Milivojević. “Liquid velocity in a three and two phase external loop airlift reactors.” 2011. Web. 21 Oct 2019.

Vancouver:

Milan M. Liquid velocity in a three and two phase external loop airlift reactors. [Internet] [Doctoral dissertation]. University of Belgrade; 2011. [cited 2019 Oct 21]. Available from: http://dx.doi.org/10.2298/BG20110318MILIVOJEVIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=914 ; https://fedorabg.bg.ac.rs/fedora/get/o:7437/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=40683791.

Council of Science Editors:

Milan M. Liquid velocity in a three and two phase external loop airlift reactors. [Doctoral Dissertation]. University of Belgrade; 2011. Available from: http://dx.doi.org/10.2298/BG20110318MILIVOJEVIC ; http://eteze.bg.ac.rs/application/showtheses?thesesId=914 ; https://fedorabg.bg.ac.rs/fedora/get/o:7437/bdef:Content/get ; http://vbs.rs/scripts/cobiss?command=SEARCH&base=99999&select=ID=40683791

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