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• Propellers high speed low viscosity • Turbines Moderate viscosity • High efficiency impellers Three blade marine propeller Straight blade turbine Disk turbine Concave blade CD 6 impeller • Propellers high speed low viscosity • Turbines Moderate viscosity • High efficiency impellers Three blade marine propeller Straight blade turbine Disk turbine Concave blade CD 6 impeller
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• Propellers high speed low viscosity • Turbines Moderate viscosity • High efficiency impellers Three blade marine propeller Straight blade turbine Disk turbine Concave blade CD 6 impeller Several points along the curve are used for evaluation The loading point L shows when the mixer is completely filled and closed This point is used as a time base for calculation only The stable torque point S is when the torque reaches a stable value usually
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Solution of the models over successive time intervals allows the computation of complete dispersion temperature and torque/power profiles for a mix cycle The mix models exhibit good fits to experimental torque and temperature curves for mixing natural rubber with carbon black over a wide range of carbon black loadings 0 to 50 phr for rotor speeds ranging from 40 to 70 RPM in two lab Motor torque N m Optimal motor speed rpm rad/sec wopt w= b/ 2m Max lifting speed m/s V=P/F Pulley diameter m mm D=2V/w Page 060 445 995 200 006 060 380 058 023 760 055 044
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Starch gelatinisation speed Slope γ Slope of curve between C3 and C4 Enzyme degradation speed Table 2 Experiment composition target torque for C1 11 Nm Experiment Number of experiment Mixing speed rpm Initial bowl and 1 st step studyWhat Torque Really Means Power Tools What Does Torque Rating Really Mean Cordless tools have come of age Now newer technology allows cordless tools to perform on or near par with their corded counterparts You might want to take another look at
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18/7/ 32 Motor torque that is the output torque of the motor is one of the basic parameters of the motor The unit is NM Formula T=P/n This formula is a calculation formula for the relationship between torque power and speed commonly used in engineeringPower Torque Speed Impeller power consumption can be calculated as a product of the direct torque rotational impeller speed and a coefficient usually equal to 2 times a unit conversion factor if required The power consumption of the mixer motor
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converts torque and the rotational speed of the rotors into apparent viscosity and shear rate Bousmina’s model 5 like Goodrich e Porter’s 1 is based on the following approximation the fluid motion due to the rotation of the rotor blades by an overall macroscopic equivalent flow generatedHowever machines with higher free volume and lower torque capacity can actually run at even higher screw speeds than so called “high speed high torque” models W P’s MegaVolume series goes up to rpm for diameters of 34 to 76 mm and achieves up to rpm for diameters from 98 to 125 mm W P’s MegaCompounder runs at up to rpm for sizes from 25 to 70 mm
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23/9/ 32 If we plot the motor and load torque speed curve vs speed There are two types of intersections of the torque speed curves 1 a stable intersection occurs whenever load curve slope exceeds motor curve slope Once you get to this point you tend to remain thereFIGURE 472 A Torque speed relationships for flagellar motors of diverse species measured using various methods All measurements were made at room temperature except where indicated The E coli experiments using electrorotation gray circles and beads black circles did not report absolute torques so these curves are scaled to a stall torque of pN nm Sowa and Berry where
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the torque requirements of a drill press Fig 4 When a large hole is being drilled the drill is operated at a low speed but it requires a very high torque to turn the large drill in the material When a small hole is being drilled the drill is operated at a high speed but it requires a very low torque to turn the small The mixer is not fully specified until torque τ and lateral loads fluid force F are included in the analysis 14 7 40 τ = N p ρ N 2 D 5 2 π 7 52 F = N F ρ N 2 D 4
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1/1/ 32 After this peak torque was reached the flow curve was then measured The vane was first rotated at a speed of 63 rad/s 10 rps for a breakdown period of 25 s Torque measurements were then recorded for five speeds ranging in descending order from 63 rad/s to 13 rad/s 10 rps to 02 rps 1 Shear flow curve in mixing systems A simplified approach Patrice Estellé Christophe Lanos LGCGM Département Matériaux et Thermo Rhéologie Institut Universitaire Technologique rue du Clos Courtel BP Rennes Cedex 7 France ∗ Author
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N = agitator speed revolutions per hour Figure 4 is a typical power correlation curve for agitated liquid batch Both of the axes are defined in logarithmic scale The x axis is the Reynolds number as calculated by equation 14 The y axis is the experimentally1 Shear flow curve in mixing systems A simplified approach Patrice Estellé Christophe Lanos LGCGM Département Matériaux et Thermo Rhéologie Institut Universitaire Technologique rue du Clos Courtel BP Rennes Cedex 7 France ∗ Author
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Figure 4 shows the Torque Speed profile of Variable Torque Loads We see that at 50 base speed the torque demanded by the load is 25 Typically as the speed decreases the torque decreases with the square of the speed and the speedspeed torque curve of the motor the current and efficiency plots and the theoretical cold calculations that estimate motor performance 1 Calculating Initial Power Requirements DC motors are transducers because they convert electrical power P inP
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However machines with higher free volume and lower torque capacity can actually run at even higher screw speeds than so called “high speed high torque” models W P’s MegaVolume series goes up to rpm for diameters of 34 to 76 mm and achieves up to rpm for diameters from 98 to 125 mm W P’s MegaCompounder runs at up to rpm for sizes from 25 to 70 mm1/1/ 32 After this peak torque was reached the flow curve was then measured The vane was first rotated at a speed of 63 rad/s 10 rps for a breakdown period of 25 s Torque measurements were then recorded for five speeds ranging in descending order from 63 rad/s to 13 rad/s 10 rps to 02 rps
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1/9/ 32 However machines with higher free volume and lower torque capacity can actually run at even higher screw speeds than so called “high speed high torque” models W P’s MegaVolume series goes up to rpm for diameters of 34 to 76 mm and achieves up to rpm for diameters from 98 to 125 mm W P’s MegaCompounder runs at up to rpm for sizes from 25 to 70 mmSeveral points along the curve are used for evaluation The loading point L shows when the mixer is completely filled and closed This point is used as a time base for calculation only The stable torque point S is when the torque reaches a stable value usually
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