scholarly journals Modification of Planetary Mixer with Strainer Arrangement

2021 ◽  
Author(s):  
Mahesh Chavan ◽  
Dnyaneshwar Kapase ◽  
Manish Parachande ◽  
Shambhu Hingmire ◽  
Mahesh Gund ◽  
...  
Keyword(s):  
Flow Pattern ◽  
Vortex Formation ◽  
Poor Quality ◽  
Main Flow ◽  
Specific Flow ◽  
Spiral Path ◽  
Equivalent Time ◽  
Conventional Machine ◽  
Fixed Axis ◽  
Metal Oxide Powder

The stirrer of conventional machine rotates in one direction only which creates a specific flow pattern within the fluids hence the particles tend to stay to the walls of container owing to the force instead of mixing thoroughly in mixture of paint, ultimately results into poor quality mixture of paints there by poor quality output of paint . In order to possess a through mixing of metal oxide powder it might be appropriate to possess a stirrer that rotates such rotates about own axis also revolves about another fixed axis which helps it reach all parts of the container. This ensures that turbulence required for thorough mixing is provided all over the container. It would be advantageous to vary pattern of flow, which avoids vortex formation, i.e. motion of particles in a spiral path. Also if a wiper is added that brings the particles adhering to walls of container back to main flow or mixing area, good quality mixture are going to be ensured. The planetary mixer with strainer may be a perfect solution that has all the above mentioned features. This machine involves a rotating stirrer that revolves about the fixed container axis also as incorporates an strainer that changes the flow pattern and also acts as a wiper. Machine has variable mixing speed feature at an equivalent time delivers heavy torque to the stirrer for proper mixing.

scholarly journals Double Helical Spiral Mixer

2021 ◽  
Vol 9 (VII) ◽  
pp. 2784-2786
Author(s):  
Mr. Shaikh Mosin. K
Keyword(s):  
Metal Oxide ◽  
Flow Pattern ◽  
Centrifugal Force ◽  
Conventional Method ◽  
New Products ◽  
Poor Quality ◽  
Oxide Powder ◽  
Production Costs ◽  
Conventional Machine ◽  
Metal Oxide Powder

Recently in advance mixer and blender designs have contributed to the growing success of food companies, meeting their requirement for consistency and developing new products, with lowering production costs. This paper discusses both traditional and new specialty mixing technologies available to food manufacturers today. Phases and viscosity are used to classify different mixing categories. Sample applications are presented as well to illustrate certain processing challenges and the mixing technologies used to resolve them. In conventional method of mixing the metal oxide powder and vehicle mixing is perform on ‘Unidirectional Stirring Machine’. The stirrer of conventional machine rotates in only one direction which creates a particular flow pattern in the fluids. Hence the particles tend to stick to the walls of container owing to the centrifugal force rather than mixing thoroughly in mixture of paint, ultimately results into poor quality mixture of paints there by poor quality output of paint.

Numerical analysis of the groove effect on the tip leakage vortex cavitating flow

2019 ◽  
Vol 234 (6) ◽  
pp. 836-847
Author(s):  
Zhaodan Fei ◽  
Rui Zhang ◽  
Hui Xu ◽  
Tong Mu
Keyword(s):  
Flow Pattern ◽  
Flow Characteristics ◽  
Cavitating Flow ◽  
Main Flow ◽  
Leakage Flow ◽  
Tip Leakage Flow ◽  
Tip Leakage Vortex ◽  
Tip Leakage ◽  
Curvature Effects ◽  
The Mean

In this paper, the groove effect on the tip leakage vortex cavitating flow characteristics of a simplified NACA0009 hydrofoil with tip gap is studied. Considering local rotation characteristics and curvature effects of the tip leakage vortex flow, the rotation-curvature corrected shear-stress-transport turbulence model is applied to simulate the time-averaged turbulent flow. The Zwart–Gerber–Belamri cavitation model is used to simulate the cavitating flow. The results show that the groove could affect the tip leakage vortex cavitating flow. The groove enhances the interaction between the tip leakage flow and main flow, and then it affects the cavitation of the tip leakage vortex. Compared with the non-groove case, for groove cases of αgre ≤75°, the tip leakage vortex cavitating flow is suppressed, the flow pattern in the gap is improved, and the mean leakage velocity Vlk < 0.8. The region of high leakage velocity is eliminated and the distribution of the pressure is more uniform. The tip leakage vortex cavitation area is reduced, and the maximum decrease is 72.90%. While for groove cases of αgre≥90°, neither the tip leakage vortex cavitating flow nor flow pattern in the tip gap is ameliorated, the mean leakage velocity Vlk lies the range from 0.90 to 0.96. The region of high leakage velocity still exists and even the tip leakage vortex cavitation area is increased. Based on three-dimensional streamlines and vorticity transport equation, the interaction between the tip leakage flow and main flow leads to the variation of the tip leakage vortex cavitating flow. This paper aims for a useful reference to mitigate the tip leakage vortex cavitation and control the influence of the tip leakage vortex cavitating flow for the hydraulic machinery.

scholarly journals STUDY AND ANALYSIS OF SILTATION AT NAHRE GHASR FISHERY PORT

2017 ◽  
pp. 36
Author(s):  
Mehrdad Orooghi Amidi ◽  
Mohsen Soltanpour ◽  
Zahra Ranji
Keyword(s):  
Flow Pattern ◽  
Suspended Sediment ◽  
Persian Gulf ◽  
Water Surface ◽  
Numerical Models ◽  
Dominant Role ◽  
Measured Data ◽  
Main Flow ◽  
Flow Mechanisms ◽  
The Persian Gulf

The discharge of Arvand River and tidal currents affect the large siltation at Nahre Ghasr Fishery Port, located at the Nahre Ghasr channel, the Persian Gulf. Using 2DH and 3D numerical models, the flow pattern at the channel was investigated to study the details of siltation problem. The local model was calibrated by the measured data of water surface and suspended sediment rate. The main flow mechanisms that can affect the rate of siltation including the horizontal exchange, the vertical exchange and tidal filling, were analyzed. The study showed that tidal filling plays the dominant role on the sedimentation at Nahre Ghasr channel. Different scenarios were also examined for reducing the siltation rate at the port.

scholarly journals Die invloed van nate op die loop van die Oranjerivier in die omgewing van die Augrabieswaterval Nasionale Park

Koedoe ◽  
1983 ◽  
Vol 26 (1) ◽  
Author(s):  
M. J Slabbert ◽  
S. J Malherbe
Keyword(s):  
Flow Pattern ◽  
National Park ◽  
Main Flow ◽  
Lattice Type ◽  
Type Flow ◽  
Flow Directions ◽  
Geomorphological Features

wee duidelike, bykans vertikale noord- en ooswaarts- neigende naatstelsels is goed ontwikkel dwarsdeur die Augrabieswaterval Nasionale Park. Die twee hoofvloeirigtings van die rivier stem ooreen met die orientasie van die naatstelsels. Die tralievormige vioeipatroon van die rivier kan hiervolgens verklaar word. Hierdie nate tesame met ondergeskikte nate en verskuiwings kan ook sekere geomorfologiese verskynsels in die park verklaar. Two distinct, near-vertical, north- and east-trending joint sets are well developed throughout the Augrabies Falls National Park. The two main flow directions of the river are in accordance to the orientation of these joints. The lattice-type flow pattern of the river can therefore be explained by their influence. These joints together with subordinate joints and faults could explain some of the geomorphological features within the park.

scholarly journals Effect of the Flow Rate on Plant Growth and Flow Visualization of Nutrient Solution in Hydroponics

Horticulturae ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 225
Author(s):  
Bateer Baiyin ◽  
Kotaro Tagawa ◽  
Mina Yamada ◽  
Xinyan Wang ◽  
Satoshi Yamada ◽  
...  
Keyword(s):  
Plant Growth ◽  
Flow Pattern ◽  
Nutrient Solution ◽  
Flow Rate ◽  
Crop Production ◽  
Solution Flow ◽  
Specific Flow ◽  
Image Velocimetry ◽  
Swiss Chard ◽  
The Ideal

In hydroponics, the flow pattern of nutrient solution in a cultivation container affects the growth of plants. Even if the flow rate of nutrient solution is the same between containers, the flow pattern may differ based on the size and shape of the containers. Therefore, the flow pattern cannot be comprehensively described by flow rate alone. In order to identify the relationship between plant growth, root morphology, nutrient uptake, and flow pattern, a hydroponic cultivation of Swiss chard was carried out. In addition, in order to describe the flow pattern in a specific cultivation container, hydroponic flow patterns were observed via flow field visualization using particle image velocimetry. As a result, with the increase in flow rate, it was found that a specific flow rate can form an ideal flow pattern for plant growth. Under this flow pattern, nutrient absorption is promoted and roots are elongated, thereby absorbing more nutrients and further promoting plant growth. However, when the flow rate exceeds the ideal value, plant growth is hindered. In summary, identifying the ideal nutrient solution flow pattern in hydroponics can facilitate better crop production.

scholarly journals Numerical Investigation of Flow Characteristics of Molten Steel in the Tundish with Channel Induction Heating

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1937
Author(s):  
Bin Yang ◽  
Hong Lei ◽  
Yingshi Xu ◽  
Kun Liu ◽  
Peng Han
Keyword(s):  
Fluid Flow ◽  
Flow Pattern ◽  
Numerical Investigation ◽  
Induction Heating ◽  
Molten Steel ◽  
Flow Behavior ◽  
Plug Flow ◽  
Flow Characteristics ◽  
Main Flow ◽  
Mixed Flow

In the continuous process, fluid flow is an important physical phenomena in the tundish, as it affects the process of heat transfer, bubble motion and inclusion collision-coalescence and grow up. This paper undertakes a detailed numerical investigation of fluid flow characteristics in the tundish with and without induction heating. The individual unit method and the volume subtraction model are applied to analyze the flow characteristics. A quantitative evaluation method of flow characteristics is proposed to investigate the flow characteristics. In the tundish with and without induction heating, firstly, the main flow behavior of molten steel is mixed flow in the receiving chamber; secondly, the main flow behavior of molten steel is plug flow in the channel; lastly, the main flow pattern is mixed flow, and the minor flow pattern is plug flow in the discharging chamber. The method of the volume subtraction model is an effective way to analyze the flow characteristics in the tundish with channel induction heating.

scholarly journals PAROKSIZMALNA NOČNA HEMOGLOBINURIJA - PRIPOROČILA ZA ODKRIVANJE BOLEZNI TER PREGLED POPULACIJE BOLNIKOV V SLOVENIJI

2016 ◽  
Vol 85 (7-8) ◽  
Author(s):  
Jasmina Hauptman ◽  
Darja Žontar ◽  
Irena Preložnik Zupan
Keyword(s):  
Bone Marrow ◽  
Myelodysplastic Syndrome ◽  
Aplastic Anemia ◽  
Hemolytic Anemia ◽  
Bone Marrow Failure ◽  
Poor Quality ◽  
Medical Centre ◽  
Specific Flow ◽  
Dark Urine ◽  
Pnh Clone

Background: Paroxysmal nocturnal hemoglobinuria (PNH) is a rare, acquired disease associated with hemolytic anemia, bone marrow failure, thrombosis, and, frequently, poor quality of life. It is caused by defects in the membrane of blood cells, where there is a lack of protein on the cell surface, which inhibits complement activation. We wanted to know the recognition of the disease in Slovenia and the incidence. We prepared the recommendations for discovering of the disease. Patients and methods: We collected data of 68 patients with prospective analysis of one – year period from 1.10.2013 to 30.9.2014 whose blood was sent to the laboratory of immunology and cytology because of suspected presence of PNH clone. The analysis of peripheral blood was performed with multiparametric high specific flow cytometry in a specialized laboratory KO of Haematology University Medical Centre in Ljubljana. Results: PNH clone was positive in 13/68 (19%) patients, 55/68 (81%) patients had a negative PNH clone, most positive samples were sent from the University Medical Centre Ljubljana (7/13). 4/13 positive patients were newly discovered. In average the incidence through 10-years was 1,3 / 1,000,000 population/year. The most common cause of PNH patient referral to a specialist hematologist was unexplained cytopenia - 12/13 (92.3%), the most common symptoms were fatigue and dyspnea (100%), in 2/13 patients was present dark urine with hemoglobinuria, 2/13 patients had transient renal insufficiency. 11/13 patients with positive PNH clone had associated a bone marrow failure (aplastic anemia or myelodysplastic syndrome).  The size of PNH clone varied from patient to patient. Conclusions: Early identification of PNH is a key to effective treatment and survival of patients. We recommend determining PNH clone at Coombs negative hemolytic anemia, hemoglobinuria, an unexplained cytopenia, aplastic anemia, myelodysplastic syndrome with laboratory evidence of haemolysis and unexplained thrombosis.

Flow separation at the upstream edge of a square-edged broad-crested weir

1972 ◽  
Vol 52 (2) ◽  
pp. 307-320 ◽  
Author(s):  
W. D. Moss
Keyword(s):  
Simple Model ◽  
Flow Pattern ◽  
Turbulent Mixing ◽  
Separation Bubble ◽  
Surface Profile ◽  
Main Flow ◽  
Mixing Zone ◽  
Flow Mechanism ◽  
Complex Character ◽  
Static Head

A simple model is suggested to explain the flow mechanism at the upstream edge of a square-edged broad-crested weir. The separation bubble that may be seen to occur at this point is treated as an area of constant static head, while the main flow outside the bubble is deemed to be irrotational and divided from the bubble by a free streamline. If this model is accepted, the flow pattern will be such that energy requirements will be met along the free surface and the streamline bounding the bubble while, within these boundaries, the Laplace equation will be satisfied at every point. Accordingly, a solution satisfying these conditions is established by the use of a relaxation technique.In practice, it is likely that the cavity flow within the bubble will be bounded not by a single streamline but by a turbulent mixing zone and that there will be some increase in pressure near the point of re-attachment. Nevertheless, the surface profile and flow pattern observed in experiments show fair agreement with those predicted using the simple model. Whilst acknowledging, then, that the bubble and the zone bounding it are in fact of a more complex character, we may say that this simplified treatment affords a sound model of the main flow and so permits a better understanding of the action of the square-edged broad-crested weir.

On the Main Flow Pattern in Hydrocyclones

1993 ◽  
Vol 115 (1) ◽  
pp. 21-25 ◽  
Author(s):  
C. C. Hwang ◽  
H. Q. Shen ◽  
G. Zhu ◽  
M. M. Khonsari
Keyword(s):  
Theoretical Model ◽  
Flow Field ◽  
Closed Form ◽  
Flow Pattern ◽  
Main Flow ◽  
Experimental Measurements ◽  
Main Body ◽  
Governing Equations ◽  
Adequate Representation ◽  
Good Agreement

A theoretical model is developed for the prediction of the main flow pattern in hydrocyclones. The model regards the main body of the cyclone as inviscid and includes provisions for the fluid underflow in cyclones. The governing equations are solved analytically in closed form. To verify the results, a laboratory-scale conically-shaped hydrocyclone was designed, built, and tested. Experimental measurements for axial and tangential velocities are presented with a series of tests solely devoted to the effect of underflow. The theoretical and experimental results are shown to be in good agreement. It is concluded that such an inviscid model gives an adequate representation of the main flow field in a cyclone.

Two-Phase Flow Patterns and Flow-Pattern Maps: Fundamentals and Applications

2008 ◽  
Vol 61 (5) ◽  
Author(s):  
Lixin Cheng ◽  
Gherhardt Ribatski ◽  
John R. Thome
Keyword(s):  
Heat Transfer ◽  
Flow Pattern ◽  
Two Phase Flow ◽  
Flow Patterns ◽  
Newtonian Fluids ◽  
Future Research ◽  
Phase Flow ◽  
Context Modeling ◽  
Two Phase ◽  
Specific Flow

A comprehensive review of the studies of gas-liquid two-phase flow patterns and flow-pattern maps at adiabatic and diabatic conditions is presented in this paper. Especially, besides other situations, this review addresses the studies on microscale channels, which are of great interest in recent years. First, a fundamental knowledge of two-phase flow patterns and their application background is briefly introduced. The features of two-phase flow patterns and flow-pattern maps at adiabatic and diabatic conditions are reviewed, including recent studies for ammonia, new refrigerants, and CO2. Then, fundamental studies of gas-liquid flow patterns and flow-pattern maps are presented. In the experimental context, studies of flow patterns and flow-pattern maps in macro- and microscale channels, across tube bundles, at diabatic and adiabatic conditions, under microgravity and in complex channels are summarized. In addition, studies on highly viscous Newtonian fluids (non-Newtonian fluids are beyond the scope of this review) are also mentioned. In the theoretical context, modeling of flow-regime transitions, specific flow patterns, stability, and interfacial shear is reviewed. Next, flow-pattern-based heat transfer and pressure drop models and heat transfer models for specific flow patterns such as slug flow and annular flow are reviewed. Based on this review, recommendations for future research directions have been given.

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