Effect of shear rate on aggregate size and structure in the process of aggregation and at steady state

Kód výsledku v IS VaVaI

RIV/67985874:_____/13:00384987 - isvavai.cz

Výsledek na webu

https://www.sciencedirect.com/science/article/pii/S0032591012007632?via%3Dihub

DOI - Digital Object Identifier

10.1016/j.powtec.2012.11.014

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of shear rate on aggregate size and structure in the process of aggregation and at steady state

Popis výsledku v původním jazyce

The paper deals with the dependence of aggregate properties on the shear rate (G) in the aggregation process and at steady state. Natural raw water and ferric sulphate were aggregated in a Taylor–Couette reactor. The methods of image and fractal analysis were used to determine the aggregate size and structure. It was observed that at the early phase of aggregation, the aggregate growth rate is higher for lower shear rates. At G≤150 s−1, the time aggregation curve contains the local maximum before reaching the steady state. Moreover, the different extent of break-up and restructuring was proved for different values of shear rate. At G≥200 s−1, the aggregation curve misses the local extreme completely. Itwas found thatwith increasing shear rate (G=21.2–347.9 s−1), the aggregates are smaller (d=1504–56 μm),more compact (D2=1.54–1.91) and more regular (Dpf=1.37–1.10). A relationship for the description of dependence of fractal dimension on the shear rate was also suggested.

Název v anglickém jazyce

Effect of shear rate on aggregate size and structure in the process of aggregation and at steady state

Popis výsledku anglicky

The paper deals with the dependence of aggregate properties on the shear rate (G) in the aggregation process and at steady state. Natural raw water and ferric sulphate were aggregated in a Taylor–Couette reactor. The methods of image and fractal analysis were used to determine the aggregate size and structure. It was observed that at the early phase of aggregation, the aggregate growth rate is higher for lower shear rates. At G≤150 s−1, the time aggregation curve contains the local maximum before reaching the steady state. Moreover, the different extent of break-up and restructuring was proved for different values of shear rate. At G≥200 s−1, the aggregation curve misses the local extreme completely. Itwas found thatwith increasing shear rate (G=21.2–347.9 s−1), the aggregates are smaller (d=1504–56 μm),more compact (D2=1.54–1.91) and more regular (Dpf=1.37–1.10). A relationship for the description of dependence of fractal dimension on the shear rate was also suggested.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

GAP105/11/0247: Charakterizace organických látek produkovaných sinicemi a řasami a jejich vliv na koagulaci a flokulaci

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Powder Technology

ISSN

0032-5910

e-ISSN

—

Svazek periodika

235

Číslo periodika v rámci svazku

February

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

10

Strana od-do

540-549

Kód UT WoS článku

000316039400068

EID výsledku v databázi Scopus

2-s2.0-84871505445