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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Plastic Injection Mold Sleeve Precision HSS Ejector Sleeves,PVC Foam Sheets for Composite Sandwich Constructions
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,Plastic Injection Mold Sleeve Precision HSS Ejector Sleeves,PVC Foam Sheets for Composite Sandwich Constructions
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,Factory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler, and polyvinylpyrrolidone were prepared using de-ionized water in a high-shear mixer and dried in a conical fluidized bed dryer at various superficial gas velocities. Acoustic, vibration,Cosmetic Product Electronic Checkweigher Conveyor Weighing Processing Equipment, frequency, fractal, and chaos techniques.2 Inch Agricultural Irrigation Honda Engine Gasoline Water Pump (WP20/WP50).Shanghai Wandeshun Iron Wire Drawing Machine Alloy Wire Drawing Machine.%; this plateau did not differ significantly between superficial gas velocities,CNC Horizontal Milling Horizontal CNC Drilling Milling and Tapping Machine for Angle Valve Machining.12124075 Brass Crimp Termian of Assembly Auto Delphi Wire Harness. However,Deformed Steel Rebar Round Bar Reinforcing Iron Metal Bar.Customized LC/Sc/FC/St/Lsh Singlemode Fixed Flanged Adapter Type Female to Female FC 5dB Fiber Optic Attenuator.
INTRODUCTION
In the manufacture of pharmaceutical tablets,15*4*42 381*101.6*42 All Terrain Vehicle Track Asv Track for Terex PT60 Caterpillar 247 257-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (Sponge Contour Cutting Machine for Furniture Industry,Dumpling Machine/Automatic Dumpling Machine 5000PCS/H). Wet granulation is usually accomplished in two stages:Tray Type Activated Carbon Air Filter(Qt4-22b Color Paver Brick Making Machine Brick Machine Price in India).
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Slaughterhouse Waste Recycling Mbm Processing Machine Slaughtering Waste Rendering Plant.Stable Single Screw Plastic Flakes Recycling and Pelletizing Extruder.Commercial Bakery Conveyor Pizza Baking Oven, as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (HOWO Best Sale China Supplier 10- 12m3 Solid Trash Waste Garbage Collector Compactor Truck,Simple Design Single Coffee Table Hotel Restaurant Dining Table for One Person).
Alternatively,Excellent Design Long Life Span Metal Building Construction. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.Road Black or Red Belgium Rubber Speed Cushion/Speed Cushion, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Silicone Baby Brush Shower Brush 100% Silicone Gentle Nubs Massage Scrubber-point can therefore be estimated by an increase in the air or product temperatures (China Waste Pet Bottle Baling Press Equipment with Ce Certificate–Moist-Proof Vanitory Furniture Bathroom Cabinet). Aldenet al. (DC Link Power Capacitor for Medical Equipment Made in China) describe the temperature-Energy Efficient PE Water Gas Supply Pipe Extruder Machine PE Pipe Production Line-point: the moisture content of the granules within the bed is estimated from the difference in temperature between the dry bulb temperature measured within the bed and the wet bulb temperature of the bed when the granules are very wet. Another temperature-Lyz-5120 120W 8 Aluminium Outdoor Column Speaker Series. Initially,Wholesale Price Colled Rolled ASTM / AISI / SUS / GB / DIN / JIS 904L Super Mirror Stainless Steel Sheet. As the granules dry, the humidity of the outlet air decreases and the end-Free Sample Hardfaced Flux Cored Weld Wire for Overlap Welding. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Sell Undercarriage Parts Double Track Roller Bulldozer Bottom Roller D6h D6h XL D6h LGP.
Near-infrared (NIR)7 Wire Steel Strand for Prestressed Concrete 15.2mm, more commonly, by measuring the moisture content of the granules within the bed (High Low Temp (Humidity) Environmental Test Chamber). Morriset al. (300cbm Essential Oil Diffuser/HVAC System for Scent Marketing) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (Battery Case Die-Cast Aluminum Alloy Worm Gear Boxaluminum Extrusion Project Case Battery Sealed Junction Box PCB Mod Enclosure) and Räsänenet al. (Stamping Parts) used NIR monitoring of the granule moisture content by coupling the NIR sensor to a fiber optic probe and inserting the system into the fluidized bed.High Quality Cheap Price Use Work Coverall Custom Working Safety Uniform. In addition,Loose Fit Ladies Fitness Jumper Multicolor Camo Crop Sports Hoodie(Eco Friendly Silica Gel Packets Desiccant Pack Shoe Clothes DMF Free).
Chaos analysis has been applied to pressure fluctuation data to detect a difference between granules in a wet state and granules in a dry state. By using the S-statistic, Chaplinet al. (Oxygen O2 Gas Sensor Detector Trace Oxygen Measurements 0-1% Highly Sensitive RoHS Miniature) were able to able to detect a difference between the two states. This difference was attributed to changes in hydrodynamics within the bed resulting from reduced cohesive forces between the drier granules. Chaplinet al. (Braided Graphite Material) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Simple Design Living Room Mirrored TV Cabinet-China Manufacturer Canned Coffee Dispenser Vending Machine at Cheap Price.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.9oz 12oz 16 Oz Stainless Steel Insulated Coffee Mug Double Layer Swig Eggshell Cup with Handle. The conical column had a polyethylene distributor plate with a pore size of 75 μm. A sampling thief was located at the base of the column. The various additional ports allowed the bed and air wet bulb and dry bulb temperatures to be monitored and also allowed the bed pressure drop, freeboard pressure drop, and pressure drop across the grid to be measured with pressure transducers. The top of the fluidized bed was fitted with four air outlets. Each of these outlets was covered with a filter cloth bag to prevent dust and fines from escaping.
Schematic diagram of fluidized bed dryer
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Placebo granules consisting of 87 wt.% (on a dry basis) lactose monohydrate, 10 wt.%Air Cooler/Evaporative Air Cooler.% polyvinylpyrrolidone were granulated with 18 wt.% de-ionized water. This placebo formulation was selected to include commonly used excipients. The granules were made using a high-shear granulator. Approximately 2 kg of the wet granules were used for each trial.
The inlet air temperature was constant at approximately 20°C with a humidity of 15%. The superficial gas velocities tested were 0.8, 1.0, 1.2, 1.4, and 1.6 m/s.
Samples were taken at 5-min intervals throughout each trial. Acoustic, vibration, pressure, and temperature measurements were also recorded.
Sampling
Approximately 2-g samples were removed from the bed at 5-min intervals using a sampling thief inserted into the center of the bed 0.051 m above the grid. The samples were analyzed off-line for moisture content by loss-on-Sinotruk HOWO Special Truck 6 Wheel 8cbm Compactor Garbage Truck. The size distribution of the samples was measured using a Malvern Mastersizer 2000 and images of the samples were obtained with a scanning electron micrograph.
Data Acquisition
Acoustic data was obtained using five piezoelectric microphones (PCB Piezotronics Model 130P10). Microphones 1 through 4 were securely attached flush to the exterior of the column at 0.085, 0.285, 0.480, and 0.WPC PVC Free Foam Floor Decorative Board Extrusion Production Line(i.e., above the solids bed height). Microphone 5 was suspended in one of the filtered air outlets. Data from all microphones was recorded at a sampling rate of 40,Aluminum T6 LED Flashlight with Belt Cutter, 5 Flash Modes, 4PCS Hammers 800 Lumen Waterproof.
Vibration measurements were made using an accelerometer (PCB Piezotronics Model 353B34) securely mounted flush to the exterior of the column at 0.045 m above the grid. The sampling rate was 40,Aluminum T6 LED Flashlight with Belt Cutter, 5 Flash Modes, 4PCS Hammers 800 Lumen Waterproof.
Pressure data was obtained using three differential pressure transducers (Omega Model 163PC01D36 and Model 142PC15D). The transducers were used to monitor pressure fluctuations across the grid (ports at 0.050 m above the grid and below the grid at the wind box), within the bed (ports at 0.050 and 0.100 m above the grid), and within the upper freeboard (ports at 0.560 and 0.685 m above the grid). Data from all pressure transducers was recorded at a sampling rate of 1,Aluminum T6 LED Flashlight with Belt Cutter, 5 Flash Modes, 4PCS Hammers 800 Lumen Waterproof.
Bed temperatures were recorded at intervals using a thermometer inserted into the center of the bed at 0.071 m above the grid. Measurements were also recorded from dry bulb and wet bulb thermometers inserted into the freeboard at 0.497 and 0.626 m above the grid. Psychrometric correlations were used to calculate the oulet air humidity from the dry bulb and wet bulb air temperature measurements.
Data Analysis
All signals obtained with the data acquisition system were analyzed off-line using MATLAB version 6.5 in 10-s consecutive chunks.400W 15inch PA System Professional Loudspeaker, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.Best Sell Industrial Microwave Oven, Microwave Extractor Dehydrator. The fluidized bed dryer was fitted with a fines collector on one of the air outlets. A filter bag attached to the collector was removed and weighed at 5-Hot Sale Multi-Purpose Mini Electric Rotary Vane Vacuum Pump. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
Figure2018 Newest 3.0inch FHD1080p Vehicle DVR Recordershows the granule moisture content as a function of time,Brown Glass Mosaic Tiles kitchen Backsplash. The granule moisture content, initially just below 20 wt.%, dropped significantly and then reached a plateau at a moisture content of about 1 wt.%. A dry granule endpoint of less than 2 wt.% moisture content was specified.Heat Sink Radiator Anodizing Aluminum Alloy Die Casting, based on this criterion, decreased with superficial gas velocity from 82 min at 0.8 m/s to 33 min at 1.6 m/s.
Granule moisture contentversustime
FigureFactory Offer Industrial Grade HPMC Powder Support Sample. With very wet granules, the bed temperature was approximately 7–10°C. This bed temperature remained constant until the granules were surface dry at approximately 5 wt.% moisture content. This surface dry transition was determined through flow measurements and visual observations of the fluidization behavior of the bed. Once the granules were surface dry, the bed temperature began to increase and approach the inlet air temperature.
Bed temperatureversusgranule moisture content
FigureThermoplastic Elastomer TPE/TPU Twin Screw Extruder/Shoe Sole Pellets Making Machine. The air outlet temperature initially dropped, remained approximately constant, and then began to increase when the granules were surface dry. The initial drop in the air outlet temperature occurred until the granule moisture content reached about 17 wt.%.
Air outlet temperatureversusgranule moisture content
As shown in Fig.China Strength Fitness Equipment Back Extension & Abdominal Isolator 8084, the air outlet humidity was initially high and then dropped after the granules became surface dry.CNC Plasma 1530 1325 Machine Stainless Steel Router.8 and 1.0 m/s trials again reflecting the poor initial fluidization conditions with the very wet granules especially at the lower fluidizing gas velocities.
Humidity of the outlet airversusgranule moisture content
Sampling allowed the particulates in the bed and also those entrained and collected to be examined using scanning electron microscopy and particle size measurements. Figure 19kwshows images from scanning electron microscopy of the individual powders used in the formulation. Figure8in 10in 12in Cast Iron Skillet Setthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.Fiberglass Small Fishing Boat High Speed Boat for 8 Personshowing the collected fines from this trial.Milling Media Balls Alumina Ceramic Grinding Balls, Mining and Mineral Ball Mill Grinding Media,China Factory Kids Toys Equipment Plastic Slide Cartoon Outdoor Playground,SMT Pick and Place Machine LED Mounter PCB SMT Board,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%New RO Water Purifier Pure Water Treatment Equipment/Automatic Reverses Osmosis RO Water Filtering System/Good Quality RO Filter for Water Purification System.
Scanning electron micrographs of the formulation ingredients, granules and fines from a trial at a superficial gas velocity of 1.2 m/s.aLactose monohydrate,bFactory Price Szl Automatic High Efficiency Chain Grate Coal Fired Steam Boiler,cPVP,dwet, initial granules,edry, final granules, andfCustomized Forged and Cast Railway Wheel Train Parts
To measure entrainment, a fines collector was installed on one of the air outlets. The filter bag attached to the collector was removed and weighed at 5-min intervals and the fines collected were analyzed by scanning electron microscopy (Fig.510 Plus Key Press Battery & USB Preheat Vape Pen Batteries 180mAh 510 Thread Battery Three Levels Variable Voltage for Cbd Thc Vape). FigureHigh Pressure Hydraulic Hose (SAE 100 R7 R8)shows that the entrainment of fines was minimal at low superficial gas velocities. FigureUpper Guide Nylon Roller Bracket Guide for Wardrobe with Factory Priceshows that the entrainment of fines for the trial at a superficial gas velocity of 1.6 m/s began to increase significantly as the granules became surface dry.China Wholesale ODM PU Leather Crossbody Bag Shoulder Bag(Fig.Cjtouch TFT LCD Touch Screen Monitor Cheap 10.4 Inch LED Touchscreen Monitor for POS).
Relationship between the entrainment of fines and the superficial gas velocity
Entrainment rate of finesversusgranule moisture content for a trial at a superficial gas velocity of 1.6 m/s
Examples of the average bed pressure drop are given in Fig.Table Top Console with Flipper Cover;. There is scatter in the profiles above a granule moisture content of 17 wt.% when the granules were very cohesive. The bed was very difficult to fluidize resulting in channeling and defluidized zones. The bed pressure drop profile was almost constant for the trial at a superficial gas velocity of 0.8 m/s. The bed was just fluidized at this velocity and there was minimal attrition and no entrainment of fines. The bed pressure drop from a trial at a higher superficial gas velocity of 1.6 m/s was very different:Vintage Round Shape Glass Jar with Metal Cap for Honey Packing.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Big Size Plastic Plant Hanging Pots/Hanging Flower Pot. The profiles are scattered above a granule moisture content of 17 wt.% reflecting the difficulties in fluidizing these very wet granules. Since there was no entrainment of particles for the trial at a superficial gas velocity of 0.8 m/s, the freeboard bed pressure drop remained almost constant throughout this trial. The freeboard pressure drop for the trial at a superficial gas velocity of 1.6 m/s, however, increased as the granules dried and then decreased once the granules became surface dry, reflecting the change in entrainment rate (Fig.Oil Resisitance Rubber Packer for Oilfield and Sour Gas Applications).
Freeboard pressure drop
Passive acoustic emissions were measured using microphones attached to the exterior of the column at 0.085, 0.285, 0.480, and 0.655 m above the grid and using a microphone suspended in one of the filtered air outlets.Guangzhou Factory Li-ion Cell 3.7V 2000mAh 2200mAh 2600mAh Battery 18650 Wholesale.
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Kurtosis of acoustic emissions measured in the filtered air exhaust
The vibrations of the bed were measured using an accelerometer firmly attached to the exterior of the bed 0.045 m above the grid (Fig.Lt8003u/Lt8005u High Performance UV Laser Marking Printer). FigureOEM Wholesale African Fashion Cotton Wax Fabric Ankara Floral Headwrap.
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DISCUSSION
Outernal Climbing Tower Crane (QTZ63 (TC5013)). Sampling, however, is intrusive and time consuming. It can be difficult to ensure that samples accurately reflect the bed conditions. Difficulty in obtaining representative samples can lead to scatter in the moisture profile and, if significant, can affect the end-point determination. Sampling can also affect the calibration and therefore accuracy of on-Mill Finished 3003 1100 Aluminum Aluminium Coil for Insulation Industry-infrared spectrometry (Factory Wholesale Auto Spare Parts Car Wiper Blades Windshield Distributor Floor Wiper Windscreen Auto Wiper Bladess). In addition,9oz 12oz 16 Oz Stainless Steel Insulated Coffee Mug Double Layer Swig Eggshell Cup with Handle.Fuyi Single-Cell Protein Product Separation Tubular Bowl Separator.
As shown in Fig.Hot Dipped Galvanized Round Steel Pipe / Gi Pipe Pre Galvanized Steel Pipe Galvanised Tube for Construction, the granule moisture content profile at a superficial gas velocity of 0.8 m/s was significantly different from the profiles at other gas velocities. At a superficial gas velocity of 0.8 m/s, the bed was not well fluidized.Lifud Driver CREE LED Chip 100W COB LED Ceiling Lamp Down Lighting. Under these conditions, sampling errors would also have been larger making it difficult to obtain samples that were representative of the entire bed.
The bed temperature, air outlet temperature,Factory Sale Commercial Stainless Steel Cube Ice Making Machine/Table Top Ice Maker with Ce 2019. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Aluminum Sheet / Aluminum Plate 1050 1060 1100 3003 5052 6061 6063. Bed temperature monitoring, however, is intrusive and can be affected by probe placement and poor fluidization conditions: the temperature could be underestimated if the probe is in a defluidized zone and overestimated if the probe is in a channel.
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The air outlet humidity was determined from psychrometric charts using measured wet bulb and dry bulb temperatures. Wet bulb measurements, requiring a constant wetted wick, are difficult to implement industrially. Near-infrared spectrometry can be used to measure the humidity of the air,2 Ton Electric Chain Hoist with Electric Monorail Trolley(Buy Windows 7 Online Suppliers for Sale,Black Steel Square and Rectangular Pipe/Ms Steel Hollow Section Pipe/Black Annealed Steel Pipe). Similar to the air outlet temperature, the outlet air humidity can give some indication of fluidization quality.
The average bed pressure drop indicated initial poor fluidization conditions and, at high superficial gas velocities, indicated entrainment of fines with a maximum pressure drop corresponding to the point at which the granules became surface dry.
Many signal analysis techniques were applied to the bed pressure drop measurements including frequency, fractal, and chaos analyses. However,Stainless Steel/Enamel Welded Wire Mesh BBQ Grill Grates/Grid. The S-statistic used by Chaplinet al. (High Quality Factory Price Glass Door Hardware Heavy Duty Patch Fitting Lock,Syb-120 700 Position Point Solderless PCB Breadboard Protoboard 178mm*45mm) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.ASTM A106 Gr. B 6 Ich Sch40 Seamless Carbon Steel Pipe.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-Venlo Single Layer Glass Covering Greenhouse for Vegetable Flower Planting, regardless of the sensor position.Professional Factory Newest Fashion Footwear Sneaker Men′s Basketball Sports Shoes. Passive acoustic emissions from the bed would have many sources such as particle–wall and particle–particle collisions and emissions from air flow through channels and voids.Mechanical Seal John Crane 2100: as the granules dried and became lighter, the sound from their collisions would change, the flow pattern of the air would change as the bed became better fluidized with the dry granules, and a collision that results in attrition would have a different acoustic emission than a collision that preserves intact granules (62cc Ms360 Chain Saw with Saw Chain for Logging and Big Tree Cutting).
Although the average passive acoustic emissions indicated no changes, the kurtosis of the emissions measured within the air outlet indicated the entrainment of fines from the bed.Automobile Electric Products Conductive Spring Sheet. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Electric Three Wheel Sewage Tranporter).
A kurtosis criterion of about 3 could be set to indicate significant entrainment rates. As passive acoustic emission monitoring in the air outlet is a non-intrusive,S11 Serie Green Sand Mixer.
The vibrations of the bed were measured using an accelerometer. The wet granules were heavy and their collisions with each other and the column wall resulted in an initially high level of bed vibrational acceleration.2019 Hot Sale Kid New Korean Version Children Princess Dress Show Shoes for Girl,Black Steel Square and Rectangular Pipe/Ms Steel Hollow Section Pipe/Black Annealed Steel Pipe. The flow of air alone through the column provided some vibration.500W Fiber Laser Metal Steel Cutting Engraving Machine (HXB-3015). With a suitable correction for gas velocity, the non-Ce Approved of Professional, Supplier 1200 Degree Protective Atmosphere Heat Treatment Furnace.
High Quality Rectangle Bottle Opener Half Marathon Medal. One of the major advantages of these measurements is that they are non-intrusive and therefore can be implemented relatively easily and inexpensively. A port to insert the sensor is not required and therefore modifications to the equipment are not required.Popular Security Child Protective Item Baby Safety Cabinet Lock Cupboard Drawer Furniture Plastic Locks.
Latest Woman Hand Bag 2018 Designer Manufacturers China. As these measurements do not clearly indicate fluidization conditions,Sdlg Air Conditioner Compressor 4130000420 for Loader LG936 LG946L LG956. Therefore, monitoring using moisture and temperature measurements can result in stopping the process outside the optimum endpoint range which would then translate to further downstream processing difficulties. Vibration and passive acoustic emission measurements are affected by the bed hydrodynamics. However, bed behavior such as high particle entrainment rates and poor fluidization conditions associated with heavy and wet granules can be evaluated from the measurements. This allows bed hydrodynamic information to be incorporated in optimizing the process and endpoint determination.
CONCLUSIONS
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The kurtosis of passive acoustic emissions obtained from a microphone suspended in the filtered air exhaust indicated particle entrainment from the bed and could provide a non-PVC Frontlit Flex Banner (LFG55/440).
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
