scholarly journals Plane vortex flow in a cylindrical layer

2021 ◽  
Vol 14 (2) ◽  
pp. 159-170
Author(s):  
V.N. Kolodezhnov
Keyword(s):  
Vortex Flow ◽  
Cylindrical Layer

ANALISIS VARIASI JUMLAH SUDU TURBIN BERPENAMPANG PELAT DATAR PADA TURBIN AIR ALIRAN VORTEX DENGAN TIPE SALURAN MASUK INVOLUTE

2020 ◽  
Vol 7 (2) ◽  
pp. 72-78
Author(s):  
Adnan Al Farisi ◽  
Yopi Handoyo ◽  
Taufiqur Rokhman
Keyword(s):  
Power Plant ◽  
Alternative Energy ◽  
Vortex Flow ◽  
Experimental Methods ◽  
Turbine Efficiency ◽  
A Value ◽  
Current Voltage ◽  
Materials Research ◽  
The One ◽  
Flow Vortex

The One of alternative energy that is environmentally friendly is by untilize water energy and turn it into a Microhydro power plant. Microhydro power plant usually made from utilize the waterfall with the head fell. While utilization for streams with a head small drop is not optimal yet. This is a reference to doing research on harnessing the flow of a river that has a value of head low between 0.7 m – 1.4 m with turning it into a Vortex flow (vortex). The purpose of this research is to know  the effect variation number of blade on power and efficiency in the vortex turbine. This research uses experimental methods to find current, voltage, torque and rpm using a reading instrument. The materials research vortex turbine used 6 blade, 8 blade and 10 blade with flat plate. The result showed the highest efficiency is 29,93 % with produce turbine power is 19,58 W, generated on turbine with variation 10 blade with load 3,315 kg and the capacity of water 10,14 l/s. Followed with an efficiency 24,17% and produce turbine power is 15,81 W, generated on turbine with the variation 8 blade with load 3,315 kg and the capacity of water is 10,14 l/s. The the lowest turbine efficiency 22,32% with produce tuebine power 14,60 W, generated on turbine with the variation 6 blade with load 3,315 kg, the capacity of water is 10,14 l/s.

Simple explicit model of liquid mean flow in region above axial impeller

1985 ◽  
Vol 50 (11) ◽  
pp. 2396-2410
Author(s):  
Miloslav Hošťálek ◽  
Ivan Fořt
Keyword(s):  
Vortex Flow ◽  
Flow Model ◽  
Quantitative Agreement ◽  
Mean Flow ◽  
Flat Bottom ◽  
Proposed Model ◽  
Minimum Number ◽  
The Mean ◽  
Model Equations ◽  
Radial Circulation

The study describes a method of modelling axial-radial circulation in a tank with an axial impeller and radial baffles. The proposed model is based on the analytical solution of the equation for vortex transport in the mean flow of turbulent liquid. The obtained vortex flow model is tested by the results of experiments carried out in a tank of diameter 1 m and with the bottom in the shape of truncated cone as well as by the data published for the vessel of diameter 0.29 m with flat bottom. Though the model equations are expressed in a simple form, good qualitative and even quantitative agreement of the model with reality is stated. Apart from its simplicity, the model has other advantages: minimum number of experimental data necessary for the completion of boundary conditions and integral nature of these data.

Cocrystallization of Caffeine–Maleic Acid in a Batchelor Vortex Flow

2020 ◽  
Vol 20 (3) ◽  
pp. 1618-1627
Author(s):  
Zun-Hua Li ◽  
Taekyung Yu ◽  
Tu Lee ◽  
Woo-Sik Kim
Keyword(s):  
Maleic Acid ◽  
Vortex Flow

scholarly journals Platelet aggregation in patients with chronic heart failure in a "vortex" flow

2021 ◽  
Vol 28 (Supplement_1) ◽  
Author(s):  
OKSANA Trubacheva ◽  
IRINA Kologrivova ◽  
TATYAN Suslova
Keyword(s):  
Heart Failure ◽  
Platelet Aggregation ◽  
Chronic Heart Failure ◽  
Vortex Flow ◽  
Platelet Rich Plasma ◽  
Aggregate Size ◽  
Standard Methods ◽  
Aggregation Activity ◽  
Platelet Hyperaggregation ◽  
Epinephrine Concentration

Abstract Funding Acknowledgements Type of funding sources: Public Institution(s). Main funding source(s): Исследование выполнено в рамках фундаментальной темы НИИ кардиологии АААА-А15-115123110026-3. Platelet aggregation mechanisms are studied using standard methods without taking turbulence into account. However, in cardiovascular diseases, the blood rheology changes, and the parameters of the turbulent flow acquire strong prothrombotic effects. The adhesion of several platelets creates a "snowball" effect with platelet hyperaggregation, leading to rapid vessel occlusion. Thus, the study of platelet aggregation in patients with cardiovascular diseases in conditions of creating a "vortex" flow in platelet-rich plasma is very relevant. Objective to study the effect of "vortex" flow in platelet-rich plasma on spontaneous and epinephrine-induced platelet aggregation in patients with CHF. Material and method. We studied 15 patients (75% of them men) with CHD, having CHF I-III FC. Platelet aggregation activity was studied using a turbidimetric method using a laser analyzer (220 LA "NPF Biola", Russia). Platelet aggregation activity in platelet-rich plasma (BTP) was estimated by light transmission curves in % and average aggregate size in relative units (Rel. units), with the inducer epinephrine in concentrations of 2 and 10 mg/ml, with constant stirring at 800 rpm. The same parameters were evaluated byour ownproposed approach with a creation ofa "vortex" plasma flow, which were achieved by changing the mixing rate of BTP from 0 to 800 rpm. Aggregation data is presented as a median with an interquartile range (Me (Q1; Q3)). Statistical data processing was performed using SPSS packages (version 19). The differences were considered significant at a significance level of p < 0.05. Results. In patients with CHF, the indicators of spontaneous aggregation measured by the standard method were 3.1 (1.5; 4.0) % and 1.7 (1.1; 2.0) Rel. units. Under the conditions of a"vortex" flow, the aggregate size increased to 5.4 (3.2; 6.1) Rel. units(p = 0.04). The indicators of standard epinephrine-induced aggregation at a concentration of 2 mg/ml were 46.7 (35.8; 66.2) % and 15.0(11.4; 18.9) Rel. units, and when the mixing speed was changed from 0 to 800 rpm, the indicators increased to 52.7 (41.3; 76.5) % (p = 0.003) and 19.4 (17.3; 20.6) Rel. units(p = 0.04). In conditions of increased epinephrine concentration of 10 mg/ml, the indicators were 52.5 (41.9; 74.5) % (p = 0.03) and 15.8 (12.2; 18.4) Rel. units. Under the conditions of"vortex" flow, aggregation indicators were 75.4 (62.0; 80.5)% (p = 0.04), and the size of aggregates increased to 356.0 (230.5; 462.5) Rel. units. Conclusion. Standard methods for studying of platelet aggregation are not always sufficient to detect an increased pro-aggregative potential of platelets. The proposed method for creationof "vortex" flow conditions showed an increase in the size of platelet aggregates and the degree of aggregation against the background of increased epinephrine concentration in patients with chronic heart failure, which proves its effectiveness in detecting platelet hyperaggregation.

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