scholarly journals EXPERIMENTAL RESEARCHES AND COMPARISON ON AERODYNAMIC PARAMETERS AND CLEANING EFFICIENCY OF MULTI-LEVEL MULTI-CHANNEL CYCLONE / DAUGIALYGIŲ DAUGIAKANALIŲ CIKLONŲ AERODINAMINIŲ PARAMETRŲ IR VALYMO EFEKTYVUMO EKSPERIMENTINIAI TYRIMAI IR PALYGINIMAS

2015 ◽  
Vol 7 (4) ◽  
pp. 372-379 ◽  
Author(s):  
Aleksandras Chlebnikovas ◽  
Pranas Baltrėnas
Keyword(s):  
Air Flow ◽  
Level Structure ◽  
Aerodynamic Resistance ◽  
Installation Space ◽  
Channel Cross Section ◽  
Cleaning Efficiency ◽  
Flow Parameters ◽  
Cleaning Device ◽  
Process Operation ◽  
Multi Level

Multi-level multi-channel cyclone – the lately designed air cleaning device that can remove ultra-fine 20 μm particulatematter (PM) from dusted air and reach over 95% of the overall cleaning efficiency. Multi-channel cyclone technology is based on centrifugal forces and has the resulting additional filtering process operation. Multi-level structure of cyclone allows to achieve higher air flow cleaning capacity at the same dimensions of the device, thus saving installation space required for the job, production and operating costs. Studies have examined the air flow parameters change in one–, two– and three–levels multichannel cyclone. These constructions differ according to the productivity of cleaned air under the constant peripheral and transitional (50/50 case) air flow relations. Accordance with the results of air flow dynamics – velocity distribution of multi-channel cyclone, aerodynamic resistance and efficiency can be judged on the flow turbulence, the flow channel cross-section and select the most appropriate application. Cleaning efficiency studies were carried out using fine granite and wood ashes PM. The maximum cleaning efficiency was 93.3%, at an average of 4.5 g/m3, the aerodynamic resistance was equal to 1525 Pa. Nagrinėjami daugialygiai daugiakanaliai ciklonai – naujos kartos oro valymo įrenginiai, galintys pašalinti iš užterštų oro srautų ypač smulkias kietąsias daleles nuo 2 mikronų dydžio bei pasiekti virš 95 % bendrą valymo efektyvumą. Daugiakanalių ciklonų darbas pagrįstas išcentrinių jėgų bei papildomai atsirandančio filtracijos proceso veikimu. Daugialygio ciklono konstrukcija leidžia pasiekti didesnio valomo oro srauto debitą, esant tiems patiems įrenginio matmenims, taip sutaupant įrenginio darbui reikalingą plotą, gamybos bei eksploatacines išlaidas. Atliktuose tyrimuose nagrinėjamas oro srauto parametrų kitimas vieno, dviejų ir trijų lygių daugiakanaliame ciklone, kintant valomo oro debitui, esant tolygiam 50/50 periferinio/tranzitinio oro srauto santykiui. Pagal gautą oro srauto dinamiką, greičių pasiskirstymą daugiakanalio ciklono kanaluose, nustatytą pasipriešinimą bei valymo efektyvumą galima spręsti apie srauto turbulentiškumą, srautų judėjimą kanalų skerspjūviuose ir parinkti tinkamiausią pritaikymą. Valymo efektyvumo tyrimai atlikti panaudojant granito bei medienos pelenų ypač smulkias kietąsias daleles. Didžiausias valymo efektyvumas siekė 93,3 %, esant vidutinei kietųjų dalelių 4,5 g/m3 koncentracijai, kai aerodinaminis pasipriešinimas buvo lygus 1525 Pa.

scholarly journals ANALYSIS OF EXPERIMENTAL RESEARCH ON CYCLONES WITH CYLINDRICAL AND SPIRAL SHELLS / CIKLONŲ SU CILINDRINIU IR SPIRALINIU KORPUSAIS EKSPERIMENTINIŲ TYRIMŲ ANALIZĖ

2012 ◽  
Vol 5 (4) ◽  
pp. 479-486 ◽  
Author(s):  
Aleksandras Chlebnikovas ◽  
Pranas Baltrėnas
Keyword(s):  
Experimental Research ◽  
Dynamic Pressure ◽  
Air Flow ◽  
Solid Particles ◽  
Maximum Efficiency ◽  
Particulate Matters ◽  
Cleaning Efficiency ◽  
Initial Concentration ◽  
Air Cleaning ◽  
Flow Parameters

The conducted investigation is aimed at providing information on air flow parameters in the cylindrical and spiral shell (devices are designed for separating solid particles from air flow having tangent flow inlet). Experimental research has employed multi-cyclones created by the Department of Environmental Protection at Vilnius Gediminas Technical University. The study is focused on investigating and comparing the distribution of the dynamic pressure of the airflow in six-channel cyclones inside the structures of devices. The paper establishes and estimates the efficiency of air cleaning changing air phase parameters using different particulate matters. The efficiency of the cyclone has been defined applying the weighted method based on LAND 28-98/M-08 methodology. The article presents the results of experimental research on the air cleaning efficiency of cylindrical and spiral shells using 20 µm glass and clay particulate matter under the initial concentration that may vary from 500 mg/m3 to 15 g/m3 using semi-rings with windows at different positions. The obtained results has shown that the maximum efficiency of the cylindrical shell increases up to 87,3 % while the initial concentration of glass makes 15 g/m3. Santrauka Nagrinėjami ir tarpusavyje lyginami oro srauto parametrai, jų kitimas ir valymo efektyvumas cilindriniame ir spiraliniame ciklone (įrenginiai skirti kietųjų dalelių iš oro srauto su tangentinio srauto įtekėjimu atskyrimui). Eksperimentinių tyrimų metu naudojami daugiakanaliai ciklonai, sukurti Vilniaus Gedimino technikos universiteto Aplinkos apsaugos katedroje. Tyrimais buvo siekiama išanalizuoti ir palyginti kanalinių ciklonų oro srauto dinaminių slėgių pasiskirstymą įrenginių konstrukcijos viduje, nustatyti ir palyginti oro valymo efektyvumą, kintant oro fazės parametrams, panaudojant skirtingas kietąsias daleles. Ciklonų efektyvumai nustatyti svoriniu metodu, remiantis LAND 28-98/M-08 metodika. Pateikiami cilindrinio ir spiralinio korpusų ciklonų stiklo ir molio 20 µm kietųjų dalelių atskyrimo tyrimų rezultatai, esant įleidžiamai užteršto oro koncentracijai 500 mg/m3 – 15 g/m3, keičiant skirtingos geometrijos kreivalinijinius pusžiedžius. Nustatyta, kad efektyviausiai atskiriamos yra kietosios stiklo dalelės, esant 15 g/m3 pradinei koncentracijai, maksimalus efektyvumas nustatytas cilindriniame ciklone, jis siekia 87,3 %.

HIGHER ORDER CELLULAR AUTOMATA

2005 ◽  
Vol 08 (02n03) ◽  
pp. 169-192 ◽  
Author(s):  
NILS A. BAAS ◽  
TORBJØRN HELVIK
Keyword(s):  
Dynamical Systems ◽  
Cellular Automata ◽  
Level Structure ◽  
Higher Order ◽  
New Concepts ◽  
Multi Level

We introduce a class of dynamical systems called Higher Order Cellular Automata (HOCA). These are based on ordinary CA, but have a hierarchical, or multi-level, structure and/or dynamics. We present a detailed formalism for HOCA and illustrate the concepts through four examples. Throughout the article we emphasize the principles and ideas behind the construction of HOCA, such that these easily can be applied to other types of dynamical systems. The article also presents new concepts and ideas for describing and studying hierarchial dynamics in general.

1, 1'-Ferrocenedicarboxylic acid/tetrahydrofuran induced precipitation of calcium carbonate with multi-level structure in water

CrystEngComm ◽  
2021 ◽  
Author(s):  
Lihong Zhou ◽  
Guanghui Wang ◽  
Jie Du ◽  
Qinjiang Zhao ◽  
Xiang Pei
Keyword(s):  
Organic Chemistry ◽  
Calcium Carbonate ◽  
Organic Solvent ◽  
Metal Ions ◽  
Level Structure ◽  
Multi Level

The system of organic solvent and ligand had been successfully applied to regulate the coordination of metal ions in organic chemistry. Inspired by previous works, we had conducted the study...

scholarly journals Experimental Research of Gaseous Emissions Impact on the Performance of New-Design Cylindrical Multi-Channel Cyclone with Adjustable Half-Rings

2022 ◽  
Vol 14 (2) ◽  
pp. 902
Author(s):  
Aleksandras Chlebnikovas ◽  
Dainius Paliulis ◽  
Kristina Kilikevičienė ◽  
Artūras Kilikevičius
Keyword(s):  
Experimental Research ◽  
Gas Flow ◽  
Collection Efficiency ◽  
Fine Particulate Matter ◽  
Air Flow ◽  
Gaseous Emissions ◽  
Channel System ◽  
Flow Parameters ◽  
The Impact ◽  
Channel Type

Cyclones are widely used for separating particles from gas in energy production objects. The efficiency of conventional centrifugal air cleaning devices ranges from 85 to 90%, but the weakness of many cyclones is the low collection efficiency of particles less than 10 μm in diameter. The novelty of this work is the research of the channel-type treatment device, with few levels adapted for precipitation of fine particulate matter, acting by a centrifugal and filtration principle. Many factors have an impact on cyclone efficiency—humidity, temperature, gas (air) composition, airflow velocity and etc. Many scientists evaluated only the effect of origin and size of PM on cyclone efficiency. The effect of gas (air) composition and temperature, and humidity on the multi-channel cyclone-separator efficiency still demands contributions. Complex theoretical and experimental research on air flow parameters and the efficiency of a cylindrical eight-channel system with adjustable half-rings for removing fine-dispersive particles (<20 μm) was carried out. The impact of air humidity and temperature on air flow, and gaseous smoke components on the removal of wood ashes was analyzed. The dusty gas flow was regulated. During the experiment, the average velocity of the cyclone was 16 m/s, and the temperature was 20–50 °C. The current paper presents experimental research results of wood ash removal in an eight-channel cyclone and theoretical methodology for the calculation of airflow parameters and cyclone effectiveness.

Air Flow Straighteners’ Application to Reduce the Power Consumption of Exhaust Ventilation Schemes

2018 ◽  
Vol 875 ◽  
pp. 137-140 ◽  
Author(s):  
Valery N. Azarov ◽  
Natalia M. Sergina ◽  
I.V. Stefanenko
Keyword(s):  
Power Consumption ◽  
Air Flow ◽  
Ventilation System ◽  
Aerodynamic Resistance ◽  
Experimental Studies ◽  
Swirling Flows ◽  
Dust Collector ◽  
Exhaust Ventilation ◽  
Outlet Pipe ◽  
Ventilation Systems

It was proposed to use air flow screw straightened units in outlet pipe of the dust collectors to reduce the aerodynamic resistance of exhaust ventilation systems. It is allowed to decrease power consumption for their maintenance operation consequently. The article describes the results of experimental studies to evaluate its effectiveness by applying the tangential screw straightened unit within ventilation system. The obtained results showed that the use of this device allows reducing the aerodynamic resistance of the cyclone by 14.6%, and for counter-swirling flows’ dust collector (CSFC) by 17.2-23.6%. It was found that meanings of the aerodynamic resistance depend on value the share proportion of the flow entering into lower CSFC apparatus’ input.

Development And Testing Of Combined germicidal Recirculator

2021 ◽  
pp. 43-49
Author(s):  
Igor M. Dovlatov ◽  
Leonid Yu. Yuferev ◽  
Svetlana A. Mikaeva ◽  
Angela S. Mikaeva ◽  
Olga E. Zheleznikova
Keyword(s):  
Exposure Time ◽  
Flow Direction ◽  
Air Flow ◽  
Live Weight ◽  
Experimental Comparison ◽  
Disinfection Methods ◽  
Flow Parameters ◽  
Poultry Facilities ◽  
Air Disinfection

The important problem of the poultry farming is the prevention of infectious diseases causing poultry deaths and unplanned financial losses. The article authors represent an overview of the air disinfection methods and the selection criteria for the disinfection methods being the most effective among other methods applicable for poultry facilities. There were determined the main factors influencing the germicidal efficiency of the ultraviolet (UV) irradiance sources. Studies were considered, where influence on the germicidal efficiency was discussed in terms of the UV irradiation exposure time in poultry facilities with floor conditions. The theoretical parameters substantiation is given for the device combining the two main disinfection components; it is done by development of both the mathematical model for the average irradiance rate calculation and the calculation method of the highspeed air flow parameters. Also, the method has been developed for determination of the needed number of the combined germicidal aerosol units in poultry keeping premises. The authors present the results of the experiments conducted for determination of the germicidal efficiency of the disinfection fulfilled against such microorganisms as Coli bacteria, Kochii bacilli, etc. with use of the developed combined recirculator. The experimental comparison with a prototype was carried out for the decontamination efficiency achieved with aid of the newly developed combined germicidal aerosol recirculator used in the following mode: the exposure time made 1 hour of work, then 2 hours of break on condition of the process cycling throughout the entire daylight hours. Here presented is the recommended layout of a number of the combined germicidal aerosol units in box-type rooms with poultry keeping on floor in a case of the ideal air flow direction. The increase by 20 % was found in the disinfection efficiency as well as the growth by 7 % in the additional live weight gain of the poultry.

Effects of variable valve timing on the air flow parameters in an electromechanical valve mechanism – A cfd study

Fuel ◽  
2022 ◽  
Vol 308 ◽  
pp. 121956
Author(s):  
Usame Demir ◽  
Gokhan Coskun ◽  
Hakan S. Soyhan ◽  
Ali Turkcan ◽  
Ertan Alptekin ◽  
...  
Keyword(s):  
Air Flow ◽  
Variable Valve Timing ◽  
Valve Timing ◽  
Valve Mechanism ◽  
Flow Parameters ◽  
Variable Valve

Effect of Sieve Unit Inclination Angle in a Rotary Cleaning Device for Barley Grain

2020 ◽  
Vol 63 (3) ◽  
pp. 609-618
Author(s):  
Zbigniew Krzysiak ◽  
Waldemar Samociuk ◽  
Janusz Zarajczyk ◽  
Karolina Beer-Lech ◽  
Grzegorz Bartnik ◽  
...  
Keyword(s):  
Inclination Angle ◽  
Barley Grain ◽  
Separation Coefficient ◽  
List Type ◽  
Technological Parameters ◽  
Cleaning Efficiency ◽  
Multi Stage ◽  
Cereal Grain ◽  
Cleaning Device

Highlights Cleaning cereal grain after harvest is very important for the quality of the product. Technological progress enables the design of new equipment for cleaning cereal grain. Grain segregation allows selecting the best grain to increase yields. The quality of segregation depends on the technological parameters of the device. Abstract. This article presents the results of laboratory tests of a new rotary cleaning device used for the separation and cleaning of barley grain. This device has the characteristics of a multi-stage screen assisted by an air stream (i.e., pneumo-separation). The prototype was constructed at the University of Life Sciences in Lublin, Poland. The tests were conducted on a test stand, which allowed changes in the operating parameters of the cleaning device and their measurement. The tests included determining the influence of the sieve drum inclination angle (a) on the effectiveness and efficiency of barley grain cleaning. The tests were carried out using two drum rotational speeds: 5 rpm and 75 rpm. The quality of the separation and cleaning of barley grain was evaluated using six cleaning process parameters: plump grain separation coefficient (Spg), fine grain separation coefficient (Sfg), fine impurities separation coefficient (Sfi), chaff separation coefficient (Sch), total coefficient of cleaning effectiveness (E), and plump grain cleaning efficiency (qpg). The results showed significant effects of the sieve drum inclination angle on the efficiency and effectiveness of barley grain cleaning. Keywords: Barley grain, Conical sieve, Grain separation, Rotary cleaning device.

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