000001695 001__ 1695
000001695 005__ 20141118153458.0
000001695 04107 $$acze
000001695 046__ $$k2007-05-14
000001695 100__ $$aPivokonský, M.
000001695 24500 $$aTHE INFLUENCE OF THE VELOCITY GRADIENT ON MORFOLOGICAL PROPERTIES OF AGGREGATES

000001695 24630 $$n13$$pEngineering Mechanics 2007
000001695 260__ $$bInstitute of Thermomechanics AS CR, v.v.i., Prague
000001695 506__ $$arestricted
000001695 520__ $$2eng$$aThis paper summarises the preliminary results concerning an influence of the agitation conditions on the aggregation processes. The properties of formed aggregates affecting the efficiency of separation processes are studied as well. The results show that the applied velocity gradient G, the period of its action T and the distribution of velocity field in an agitated volume of water significantly influence the number of aggregates, their size and shape. Smaller and denser aggregates of a homogeneous size and more resistant to breakage are formed under a higher velocity gradient. Introduction The process of aggregation of destabilised particles resulting in formation of separable aggregates belongs to the basic technological processes of water treatment. Conditions of aggregation and magnitude of adhesive and tangential forces interacting between aggregating particles in contact affect resulting characteristics of formed aggregates, their shape, size and internal structure. In complex, they determine physical characteristics of aggregates, substantially affecting the efficiency of the separation processes commonly used in water treatment technology. In the past, a great number of studies were dedicated to investigate the influence of the physical factors on the kinetics of the aggregation process and a number of relationships were derived to describe it. With the practical application aimed at controlling the performance of the works and its design, these relationships are applicable in a very limited extent only. Very few studies enabling the determination of conditions of agitation and its influence on the properties of aggregates, which influence the efficiency of the separation processes and the properties of produced sludge, were published (Hudson, 1965

000001695 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000001695 653__ $$a

000001695 7112_ $$aEngineering Mechanics 2007$$cSvratka (CZ)$$d2007-05-14 / 2007-05-17$$gEM2007
000001695 720__ $$aPivokonský, M.$$iChára, Z.$$iKysela, B.
000001695 8560_ $$ffischerc@itam.cas.cz
000001695 8564_ $$s382934$$uhttps://invenio.itam.cas.cz/record/1695/files/110-Pivokonskym-PT.pdf$$y
             Original version of the author's contribution as presented on CD, .
            
000001695 962__ $$r1585
000001695 980__ $$aPAPER