Wyniki wyszukiwania - BazTech

1

Axial thrust in a vessel with unsteady rotating axial impeller

Woziwodzki Szymon

Chemical and Process Engineering : New Frontiers

|

2023

|

Vol. 44, nr 2

art. no. e11

EN

Unsteady motion of the impeller is one of the several methods to improve mixing in unbaffled vessel. It is very important in pharmaceutical industry, crystallization processes or some chemical reaction with catalyst where baffles are not recommended. The literature data shows that unsteady mixing cause generation of axial flow for radial impellers (Rushton turbine). The purpose of this study was to investigate axial force for axial impellers like A315, HE-3 and SC-3. Moreover, the momentum number, flow number and pumping efficiency were analysed. Results shows that axial force for unsteady mixing is higher in comparison to steady-state mixing. Also, the comparison of axial force between impellers shows that blades influence momentum number and flow number. Impellers with larger blade surface generate stronger axial force. The obtained results reveal that unsteady mixing with axial impellers could be apply for solid-liquid mixing as suitable alternative to steady-state mixing.

2

Influence of a volute casing on the flow in chambers behind the front and back shroud in the single-stage centrifugal pump

Najdecki S, Papierski A

Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka

|

2008

|

nr 133

255--262

EN

The results of measurements of the pressure distribution and numerical computations of flows in chambers behind the front and back shroud of the single-stage centrifugal pump with a volute casing are presented. It has been shown how a non-uniform pressure distribution at the impeller exit can influence the flow in chambers behind the front and back shroud. It has been proven that the nature of this flow can influence significantly the magnitude of forces and bending moments on the shaft and the leakage flow through the impeller seal and, consequently, it affects the conditions of an inflow to the impeller.

3

Analiza wpływu nacisku osiowego na zużycie uzbrojenia świdrów gryzowych

Czerniec M., Jaremek P.

Eksploatacja i Niezawodność

|

2004

|

nr 4

73-78

PL

Przedstawiono wyniki badań zużycia uzbrojenia świdra trójgryzowego w oparciu o opracowane modele kinetyki kontaktu tribologicznego z urabianą calizną. Przeprowadzono rozwiązanie numeryczne zagadnienia, gdzie oszacowano zużycie uzbrojenia na poszczególnych wieńcach gryzą w zależności od wielkości nacisku osiowego działającego na przewód wiertniczy. Wyniki rozwiązania przedstawiono na wykresach.

EN

In the article are presented some results of tricone bit equipment wear tests basing oneself on worked out the model of tribological contact of this element with mining undisturbed soil. To confirm the validity of the model the numerical calculation of parameter mentioned above with regard to axial thrust were performed.