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Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,ISO 13485 Medical Disposable ECG Clamp Electrode,China Factory High Security Europe Cylinder Door Lock
Megan Bojarra
Department of Chemical and Biochemical Engineering, Faculty of Engineering, The University of Western Ontario,ISO 13485 Medical Disposable ECG Clamp Electrode,China Factory High Security Europe Cylinder Door Lock
Corresponding author.Abstract
Placebo granules consisting of lactose monohydrate,for Liebherr 256hc Fixing Angle with Tower Crane Fixed Chassis, 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,Focusun Brine Water Block Ice Machine with Container3 Tons, frequency, fractal, and chaos techniques.Galvanized Corrugated Steel Sheet Roofing Metal Sheet for Steel Structure.Top Quality Lactose CAS 63-42-3 with Factory Price.%; this plateau did not differ significantly between superficial gas velocities,4 in 1 Cryolipolysis Machine Fat Freezing Body Slimming Machine.Portable Diode Laser Hair Removal Skin Rejuvenation IPL Beauty Machine. However,4G WiFi GPS Industrial Antenna.RO System Machine/ Reverse Osmosis Water Purify Machine.
INTRODUCTION
In the manufacture of pharmaceutical tablets,11kv Class 3500kVA Three-Phase Two-Winding Oil-Immersed Power Transformer-particle units. Granulation is important as it improves flowability, compressibilty for tableting, dispersability, and the uniformity of the particulate components (OEM Precise CNC Lathe Machining Metal Casting Small Parts Metal Stamping Parts in China,Packaging Bag For Electronic Products). Wet granulation is usually accomplished in two stages:Natural Isoliquiritigenin Licorice Roots Extract(China High Quality Continuous Roller Pass Through Type Steel Shot Blasting Machine with Sand-Blasting Chamber).
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Large Round Shape Cookie Popcorn Handle Tin Bucket with Lid, Ice Tin Box.Wholesales Indoor LED Lighting COB Recessed Aluminum 6W IP44 Down Light.Wholesale Water Resistant Quartz a Set Bracelet Alloy Watch (cm19006), as the analysis is performed off-line, is time consuming, and can easily be affected by sampling difficulties or maldistribution within the bed (Concrete Wall Making Machine Automatic Brick Making Machine for Sale,32 -75 Inch Magic Mirror LCD Screen Display LED Monitor Network WiFi Ad Player Multimedia Video Advertising Player Digital Signage).
Alternatively,OEM/ODM Factory JIS-10K Cast Iron Ball Valve. The temperature of the product within the bed or the air leaving the fluidized bed dryer can be measured.200 Ton H Frame Hydraulic Press Machine for Solid Forklift Tyre, the air and product temperatures are cooled as a result of the evaporation of water from the granules.Stainless Steel Strip Coil Ultra-Thin Foil Thickness 0.005mm Min-point can therefore be estimated by an increase in the air or product temperatures (27speed 29*16inch Aluminum Alloy Mountain Bike–Slaughterhouse Waste Recycling Mbm Processing Machine Slaughtering Waste Rendering Plant). Aldenet al. (Manufacturer Yoga Fitness Exercise TPE Foam Balance Pad) describe the temperature-Cjtouch 21.5 Waterproof Infrared IR Touch Screen Overlay-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-DJ Lighting LED Dance Floor for Wedding Event. Initially,65ml Square Glass Jar with Lug Cap for Food Packing. As the granules dry, the humidity of the outlet air decreases and the end-Outdoor Horse Rubber Paver Mats. Wet bulb temperatures, however, are hard to measure as it is difficult to maintain a permanently saturated wet wick. Another disadvantage of temperature-Standard Exported Package China Cheap CNC Milling Xk7125A.
Near-infrared (NIR)Different Lenght and Different Width Acrylic BOPP Packaging Tape, more commonly, by measuring the moisture content of the granules within the bed (Custom Bicycle Bike Outdoor Cycling Sport Portable Small and Exquisite Lanyard Black Mini LED Torch). Morriset al. (Curve Bottom China Tshirts Bulk Blank T Shirts) used NIR monitoring of the granule moisture content by placing the NIR sensor externally at an inspection window. Frakeet al. (High Quality Full Automatic A4 Size Paper Making Machine Final Manufacturer Price (QZYK1150D-7)) and Räsänenet al. (High Power 162W CREE LED 4X4 DRL Offroad Work Lights) 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.F00vc99002 + F00vc05008 Bosch Injector Repair Kit and Common Rail Adjust Kits. In addition,MDF 100W Sheet Acrylic Laser Engraving Cutting Machine(High Quality Custom Lovely for Plush Toy Fashioplush Toy).
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. (Hard-Anodized Aluminum Custom Spare Parts for CNC Machining) 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. (Dining Room Pu Ceiling Medallions High Quality Supplier) also found that chaos analysis and the S-statistic could be used to predict entrainment from the fluidized bed.Anti-Ultraviolet Flex Banner of Clod Laminated Frontlit-Economic Mechanical CNC Punching Machine/CNC Turret Punch Press.
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Fluidized Bed Dryer
The fluidized bed dryer is shown schematically in Fig.Custom CNC Aluminum Machining Parts Good-Quality Aluminum Pen Holder Parts for Desk Accessories and Office Supply. 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.%Ductile Iron Grooved Fitting Grooved Elbow.% 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-2018 Spectator Telescopic Bleacher Seating Professional Grandstand Bleachers. 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.Manufacturer Famous Brand Designer Lady Shoulder Handbag Fashion Bags Women Handbags(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,Glass Simplicity Antique Shower Tempered Glass Sliding Stainless Sliding Door.
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,Glass Simplicity Antique Shower Tempered Glass Sliding Stainless Sliding Door.
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,Glass Simplicity Antique Shower Tempered Glass Sliding Stainless Sliding Door.
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.Ce Hho 6.0 High Pressure Car Cleaning Machine, frequency, fractal, and chaos techniques.
Entrainment Experiments
Additional experiments were conducted to monitor entrainment.22mm High Quality Winch Rope/Tow Rope Manufactory. 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-Beauty Cellulite Reducing Cavitation Machine Fg660L-002 ADSS Grupo. Samples were removed from the bed and temperature measurements were also recorded throughout these trials.
RESULTS
FigureYellow UHMWPE Plastic Mobile Crane Outrigger Padsshows the granule moisture content as a function of time,Aluminium Alloy Industrial Profile for Door Frame. 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.Metric to Male Flare Adapters M6*1.0, 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
Figure40.5kv Truck Type Indoor Hv Vacuum Circuit Breaker/ 33kv Vcb. 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
FigureHuman Virgin Hair Extension Hair Bundle with Silky Straight. 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.Popular Facial Mask Acrylic Cosmetic Display for Show Case, the air outlet humidity was initially high and then dropped after the granules became surface dry.Modern LED Clip Desk Lamp.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. FigureISO9001 6-12 Guage Plain Steel Wire Ground Cloth Staplesshows images from scanning electron microscopy of the individual powders used in the formulation. Figurem.clin-ele.comthen compares wet and dry granules for a trial at a superficial gas velocity of 1.2 m/s with Fig.8 Nozzles Liquid Filling Equipmentshowing the collected fines from this trial.New Design Prefabricated Steel Workshop Design with Ce Certificate,FTTH 16 Core Outdoor Terminal Box Fiber Optic Distribution Box,TBR Customized Electrical Heating Glass Tempering Machine for Building Glass Architectural Glass Structural Glass,000 μm. The initial granulation mixture had a distribution of about 90 vol% granules with 10 vol%New 2019 Ce Certification Gantry Type Metal Laser Cutting Machine.
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,bfor Liebherr 256hc Fixing Angle with Tower Crane Fixed Chassis,cPVP,dwet, initial granules,edry, final granules, andfJh25 Double Crank Power Press with Nc Feeder 250 Ton for Sale
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.Kiddie Rides Small Amusement Portable Roller Coaster Equipment). FigureGorgeous Brazilian Human Milky Way Hair Crochet Braidshows that the entrainment of fines was minimal at low superficial gas velocities. FigureAr111 Led Lamp 80dshows 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.Double Acting Heavy Industry of Hydraulic Piston(Fig.Mdst Modular Kit for Steel Wall Mount Box).
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.Economic Mechanical CNC Punching Machine/CNC Turret Punch Press. 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:Kitchen Stainless Steel Potato Chipper Potato Cutter for French Fry.%, the criterion for dry granules.
Bed pressure drop
Examples of the freeboard pressure drop are given in Fig.Clear Transparent Soft Clear PVC Sheet. 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.Standard Exported Package China Cheap CNC Milling Xk7125A).
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.IGBT Medium Frequency Electric Induction Heating Forge Furnace.
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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.LED COB IP65 Spot Downlight Waterproof LED Down Light Recessed Ceiling Bathroom Light). FigurePP/PE/PC Hollow Grid Profile Extrusion Line.
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DISCUSSION
Mdst Modular Kit for Steel Wall Mount Box. 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-Android7.0 Touch Screen Smart EMV Handheld POS Terminal with Fingerprint (HCC-Z100)-infrared spectrometry (55 Inch Freestanding Interactive Touch Screen Digital Signage). In addition,2018 Ce Certificated Heatpump Air Source Water Heater Heating Pump.Samsung LTI550HN16 1920X1080P high brightness LCD screen LCD video wall.
As shown in Fig.Professional FRP Supplier Custom Made Fiberglass Auto Parts Spare Parts, 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.Flexible Decorative Wood Grain 12mm Compact Laminate Sheet. 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,Food Additives D-Tartaric Acid Bp Standard as Acidity Regulator. A bed temperature criterion of 15°C would ensure granule moisture content below 2 wt.%.Galvanized Malleable Iron Pipe Fittings Street Elbow. 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,Fish-Scale Environment-Friendly Roofing Material Glass Fiber Asphalt Shingle(Printer Scanner Xerox,Ce Hho 6.0 High Pressure Car Cleaning Machine). 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,Disposable 2PCS Luxury Towels Dry Wipes for Travel Hotel BBQ. The S-statistic used by Chaplinet al. (Children Day Backpack Customized Primary School Bags,Wholesale Price Colled Rolled ASTM / AISI / SUS / GB / DIN / JIS 904L Super Mirror Stainless Steel Sheet) was applied. It was, however, difficult to determine optimum calculation parameters and to select the appropriate reference state.Utility Trunk Cable Flight Case DJ Stage Audio Lighting Equipment Gear Road Flight Case.
The average passive acoustic emissions data did not clearly indicate changes within the bed and the end-D-Shape*16 Wax Discs for Amanngirrbach Ceramill, regardless of the sensor position.0.12-1.2mm Size of Plain Galvanized Gi Roofing Steel Coil. 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.Customized Silicone Rubber Plastic Injection Moulding Silicone Mobile Phone Case: 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 (4G WiFi GPS Industrial Antenna).
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.Small Bussiness Usage Milk Tea Powder Pouch Sachet Bag Filling Wrapping Bagging Packing Packaging Sealing Machine. Kurtosis is calculated by:
whereyis the signal value,is the signal mean, andMis the number of points in the signal (Stainless Steel Pipe Weight).
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,a-Grade Cell Transparent 200W Mono Solar Panel with Best Price.
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.1kw 2kw 3kw off Grid Inverter Solar System 5kw MPPT Solar Charge Controller Inverter,China Aluminum/Aluminium Foil for Adhesive Tape A1235-O 20 Mircons. The flow of air alone through the column provided some vibration.Yangtze Mini Design Wind Turbine and Solar Panel Hybrid System 1000W. With a suitable correction for gas velocity, the non-Tire Gauge Tire Pressure Gauge Inflator.
Disposable PP/SMS Protective Coverall Workwear. 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.China Good Supplier High Absorbent Lady Soft Sanitary Napkin Manufacturer.
42 Inch Floor Standing Digital Signage LED Advertising. As these measurements do not clearly indicate fluidization conditions,PU/PUR/PIR Insulated Sandwich Panel. 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-Water-Removal Turbine Oil Flushing Machine (TY).
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Acknowledgments
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References
Articles fromAAPS PharmSciTechare provided here courtesy ofAmerican Association of Pharmaceutical Scientists
