scholarly journals Study on the determination of the parameters of the electric purifier

2021 ◽  
Vol 939 (1) ◽  
pp. 012023
Author(s):  
A S Berdyshev ◽  
Z Z Djumabayeva ◽  
A A Abdullaev ◽  
A Mussabekov
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Geometrical Parameters ◽  
Fluid Viscosity ◽  
Filter Performance ◽  
Magnetizing Force ◽  
Gap Height

Abstract The article is devoted to the determination of the parameters on which the filter performance depends on the hydrodynamic, electromagnetic and geometrical parameters of the fluid and pollution. These include fluid viscosity and flow rate, magnetizing force, particle size of contamination, gap height, and the distance between the turns.

scholarly journals Influence of Particle and Grain Size on Sand Filtration: Effect on Head Loss and Turbidity

2020 ◽  
Vol 8 (2) ◽  
pp. 36
Author(s):  
Racha Medjda Bouchenak Khelladi ◽  
Abdelghani Chiboub Fellah ◽  
Maxime Pontié ◽  
Fatima Zohra Guellil
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Granular Media ◽  
Particle Concentration ◽  
Head Loss ◽  
Sand Filtration ◽  
Circular Column ◽  
Filter Performance ◽  
Filter Operation ◽  
Suspended Matters

Sand filtration is an eco-friendly method to treat either drinking water or wastewater ; it requires only natural granular media. It is also easy to use and to maintain ; the only problem they face is clogging that affects filter performance, that can be detected when head loss or turbidity increase. The purpose of this work is to see what are the factors that influence the performance of filter operation, for this, we used a pilot consisting on a circular column filled with sand (from South Algeria), where various parameters were tested; pressure, flow rate, sand granulometry, suspended matters and particle concentration of the water which is filtered. After eighteen weeks of operation, we have found that head loss increases by decreasing granulometry and increasing flow rate, pressure, particle size, and concentration. However, turbidity increases by decreasing particle size and increasing granulometry and particle concentration. Turbidity and head loss have different behaviour towards the same parameter; that is why it is necessary to take them into account in order to find a compromise between acceptable head loss / turbidity for a good functioning of the filter.

Validation of HPTLC and HPLC Methods for the Quantitative Determination of Allyl Disulfide in Some Polyherbal Oils

2012 ◽  
Vol 95 (6) ◽  
pp. 1574-1578
Author(s):  
Nitin Dubey ◽  
Nidhi Dubey ◽  
Rajendra Mehta
Keyword(s):  
Particle Size ◽  
Quantitative Determination ◽  
Silica Gel ◽  
Vegetable Oil ◽  
Flow Rate ◽  
Mobile Phase ◽  
Allium Sativum ◽  
Hplc Separation ◽  
Reliable Marker

Abstract Allium sativum L (garlic) is an essential component of many polyherbal oils used in traditional systems of medicine. Allyl disulfide has been a major component found in vegetable oil macerate of garlic, and can be used as reliable marker for determination of garlic in oil macerates of garlic. The HPLC separation of allyl disulfide was achieved on a Phenomenex Luna C18 (25 cm × 4.6 mm id × 5 μm particle size) column using acetonitrile–water–tetrahydrofuran (70 + 27 + 3, v/v/v) mobile phase at a flow rate of 1.0 mL/min. Quantitation was achieved with UV detection at 298 nm over the concentration range 8–48 μg/mL. HPTLC separation of allyl disulfide was achieved on an aluminum-backed layer of silica gel 60 F254 using n-hexane mobile phase. Quantitation was achieved by densitometric analysis at 298 nm over the 200–1200 ng/band concentration range. The methods were validated according to International Conference on Harmonization guidelines.

An accurate method for determination of the performance characteristics of membrane-type restrictors

2018 ◽  
Vol 233 (5) ◽  
pp. 692-701 ◽  
Author(s):  
Wei Pan ◽  
Yongtao Zhang ◽  
Changhou Lu
Keyword(s):  
Flow Rate ◽  
Accurate Method ◽  
Performance Characteristics ◽  
Coupled Equations ◽  
Modified Method ◽  
Fluid Resistance ◽  
Deformation Equation ◽  
Membrane Type ◽  
Gap Height

The determination of flow rate and fluid resistance for membrane-type restrictors is modified in this paper, and it can be more accurate and confident from the measurements in experiments. Three coupled equations including Reynolds equation, membrane deformation equation of large axisymmetric deflection and flow rate equation have been used to establish the mathematical model of membrane-type restrictor and solved simultaneously. Several cases are simulated by the traditional method and the modified numerical method, and the simulation results are compared with experimental data for flow rates and fluid resistances. It has been found that the determination of the performance characteristics of membrane-type restrictors is significantly affected by the hypotheses of membrane deflection scales, the pressures distribution and the gap height between the sill and membrane. The numerical results of the modified method are much more approximated to the actual flow rate measured in Kang et al.’s work than those of the traditional formula, and the proposed method can increase the determination accuracy of the flow rate and restriction coefficient in the design of membrane-type restrictors distinctly.

scholarly journals Stability indicating HPLC method for the simultaneous determination of dapagliflozin and saxagliptin in bulk and tablet dosage form

2018 ◽  
Vol 31 (1) ◽  
pp. 39-43 ◽  
Author(s):  
Thiyagarajan Deepan ◽  
Magharla Dasaratha Dhanaraju
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Dosage Form ◽  
Correlation Coefficients ◽  
Hplc Method ◽  
Isocratic Elution ◽  
Rp Hplc ◽  
Tablet Dosage ◽  
Detection And Quantification

AbstractA simple, fast, and highly selective RP-HPLC method was developed for the determination of Dapagliflozin (DAP) and Saxagliptin (SAX) in API and tablet dosage form. The separation was done using a Xterra RP18 (4.6×150 mm, 5 μm particle size) column with Acetonitrile: water (60:40). The isocratic elution mode at a flow rate of 1 mL/min, and the analytes were measured at 248 nm. The retention time for DAP and SAX were about 2.091 and 3.249 min, respectively. Calibration curves were found to be linear in the ranges of 100-500 μg/ml for DAP and 50-250 μg/ml for SAX, with correlation coefficients of 0.9998. The detection and quantification values for DAP was 3.0 and 9.98 μg/ml and SAX was 3.02 and 10 μg/ml respectively.

Pyrolysis of brown algae (Bifurcaria Bifurcata) in a stainless steel tubular reactor: From a review to a case study

2018 ◽  
Vol 14 (1) ◽  
pp. 31-60 ◽  
Author(s):  
M. Y. Guida ◽  
F. E. Laghchioua ◽  
A. Hannioui
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Flow Rate ◽  
Brown Algae ◽  
Tubular Reactor ◽  
Nitrogen Flow ◽  
Nitrogen Flow Rate ◽  
Bifurcaria Bifurcata ◽  
Bio Oil

This article deals with fast pyrolysis of brown algae, such as Bifurcaria Bifurcata at the range of temperature 300–800 °C in a stainless steel tubular reactor. After a literature review on algae and its importance in renewable sector, a case study was done on pyrolysis of brown algae especially, Bifurcaria Bifurcata. The aim was to experimentally investigate how the temperature, the particle size, the nitrogen flow rate (N2) and the heating rate affect bio-oil, bio-char and gaseous products. These parameters were varied in the ranges of 5–50 °C/min, below 0.2–1 mm and 20–200 mL. min–1, respectively. The maximum bio-oil yield of 41.3wt% was obtained at a pyrolysis temperature of 600 °C, particle size between 0.2–0.5 mm, nitrogen flow rate (N2) of 100 mL. min–1 and heating rate of 5 °C/min. Liquid product obtained under the most suitable and optimal condition was characterized by elemental analysis, 1H-NMR, FT-IR and GC-MS. The analysis of bio-oil showed that bio-oil from Bifurcaria Bifurcata could be a potential source of renewable fuel production and value added chemicals.

DETERMINATION OF THE LIMITING FLOW RATE IN LIQUID FILMS FOR HEAT TRAHSFER CRISIS CALCULATION

1978 ◽  
Author(s):  
V. M. Borishansky ◽  
A.A. Andreevsky ◽  
Mikhail Ya. Belenkiy ◽  
G.S Bykov ◽  
Mikhail Gotovskii ◽  
...  
Keyword(s):  
Flow Rate ◽  
Liquid Films
Sign in / Sign up

Export Citation Format

Share Document