Power Requirements for Mixing in Bioreactor
Oct 21 2019 Once the value of Np is known the power required is calculated from equation 1 as 10/21/20197 2 8 10/21/20198 For a given impeller the general relationship between power number and reynolds number depends on the flow regime in the tank Three flow regimes 1 laminar regime 2 turbulent regime 3 transition regime 9
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Affinity laws KSB
Power input assuming identical pump efficiencies Flow coefficient Head coefficient If Δh s = Y see Specific energy is inserted the pressure coefficient in its known form can be established As pump efficiencies are more or less dependent on friction conditions they are subject to other conversion laws see Efficiency scale up The
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Design Calculation of Impeller for Axial Flow Pump
power of the pump is mechanical energy of the drive shaft driven the prime mover such as electric motor or small engine and the impeller or enters from the suction pipe to be correct passage By using vane in pump it is obtained more efficiently that the pump is head coefficient and it can be expressed by the following equation D2 N
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Sizing Impellers for Agitated Aerobic Fermenters
Re = impeller Reynolds number D2Nρ/µ dimensionless N P = impeller power number P g /ρN3D5 dimensionless N P is also P u /ρN3D5 for ungassed conditions as in Eq 4 N q = impeller pumping number Q/ND3 dimensionless P g = agitator power required to achieve a desired mass transfer rate in an aerated vessel kW i e gassed agitator
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PREDICTION OF HEAD EFFICIENCY AND POWER
power were estimated in a semi open impeller with splitter blades in ratio of 3/6 and 5/6 of the main blade length at the best efficiency point b e p Here as the splitter blade length increases the flow rate and power increases the efficiency decrease All of the
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Trouble Shooting ChecklistWiley
impeller powerActual power delivered to the process fluid natural frequencyFirst lateral vibrational frequency prime mover motor mass transfer coefficient L/t specific mass transfer coef l/t shaft length below mounting L baffle length L bearing spacing L
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ASSESSMENT OF WEAR EROSION IN PUMP IMPELLERS
power coefficient between 0 9 and 5 Prechtl 2001 claims that for a power coefficient of 3 the erosion rate is stable The material is softening with a power coefficient larger than 3 and hardening for a power coefficient smaller than 3 Turbulence Local
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Comparisional Study of Pitched Blade Impeller and Rushton
of the impeller The power is usually calculated from measurements of the torque and the shaft speed P = 2„N T q 3 C ombining equations 1 and 2 the power number can be rewritten as 4 The calculation of power number using blade element theory in combination with lift and drag coefficients from the literature
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Centrifugal compressorWikipedia
Centrifugal compressors sometimes called radial compressors are a sub class of dynamic axisymmetric work absorbing turbomachinery They achieve a pressure rise by adding kinetic energy/velocity to a continuous flow of fluid through the rotor or impeller This kinetic energy is then converted to an increase in potential energy/static pressure by slowing the flow through a diffuser
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CHARACTERIZING IMPELLER PERFORMANCE IN STIRRED
Impellers in stirred tanks are pumps Power input and flow generated can be measured Impeller characteristics are rigorously quantified Hydraulic and Flow Efficiencies Maximum Energy Dissipation Rate in Trailing Vortex Characterization confirmed by Equilibrium Droplet and Floc Sizes generated with different impellers
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Estimation of agitator flow shear rateWu2006AIChE
Apr 07 2006 Shear Rate Variation with Power Number Power flow and impeller outlet shear rate data were measured in a T390 tank operating in water tank diameter 390 mm impeller diameter 160 mm impeller to tank bottom distance 130 mm water level 400 mm The shear rates at the blade surfaces were calculated using Eq
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Mixing Impeller PowerProQuip Mixers
May 13 2019 Np impeller power number geometry factor n impeller rotational speed d impeller diameter sg specific gravity of fluid K Reynolds Number viscosity correction factor The value of the dimensionless power number Np depends on several factors including impeller design number of impellers
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Impeller Design of a Centrifugal Fan with Blade Optimization
Sep 04 2011 A method is presented for redesigning a centrifugal impeller and its inlet duct The double discharge volute casing is a structural constraint and is maintained for its shape The redesign effort was geared towards meeting the design volute exit pressure while reducing the power required to operate the fan Given the high performance of the baseline impeller the redesign adopted a high
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Coagulation and FlocculationKFUPM
Impeller Design The power imparted to the liquid by various impellers is given by For turbulent flow NRe > 10 000 in a baffled tank P = KT n3 D5 i ρ Where P = power ft lb/sec N m/s KT = impeller constant for turbulent flow n = rotational speed rps Di = impeller diameter ft m ρ=
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Power Coefficientan overview ScienceDirect Topics
The power coefficient Cp is related to power and wind speed by the expression P= 1 2 ρ C p SV 3 By replacing C p in this equation by the maximum values obtained in the preceding experiments 0 30 for rotor II and 0 25 for rotor IV and by putting ρ = 1 25 kg/m 3 the maximum power that can be produced is
Get PriceCompression impeller characteristics head coefficient
1 Performance of an impeller It is possible to estimate the performance of a centrifugal compressor in terms of compression ratio or flowrate if the manufacturer has given some information about the impeller in addition to basic dimensional data the head coefficient the flow coefficient
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An effect of the tubular baffles configuration in an
Jun 13 2018 The results of the power consumption for an agitated vessel equipped with vertical tubular baffles and high speed impeller are presented in the paper Aqueous solutions of CMC were agitated within transitional range of the non Newtonian liquid flow in the agitated vessel of inner diameter equal to 0 6 m Eight different types of the impellers were tested Rushton or Smith turbines turbine
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Three part torque converter consisting of an impeller
Description The Torque Converter block implements a three part torque converter consisting of an impeller turbine and stator with an optional clutch lock up capability The block can simulate driving power flowing from impeller to turbine and coasting power from turbine dissipated in torque converter hydraulic fluid
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11 7 Performance of Propellers
imparted to the fluid which is the change in kinetic energy of the flow as it passes through the propeller The propulsive powerthe rate at which useful work is done
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Three part torque converter consisting of an impeller
Description The Torque Converter block implements a three part torque converter consisting of an impeller turbine and stator with an optional clutch lock up capability The block can simulate driving power flowing from impeller to turbine and coasting power from turbine dissipated in torque converter hydraulic fluid
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PDF The Parameters Affect on Power Coefficient Vertical
This paper proposes the impeller wind turbine which uses more effectively the wind energy and depends only on the acting area of the vanes tip speed ration and power coefficient of a 1 m
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Power Numberan overview ScienceDirect Topics
Power number can be obtained by using the power number curves that are corresponding to the related impellers or calculated by the correlations The main correlations are the Nagata correlation and Kamei and Himoka correlation to calculate the power number
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Influence of hydrophibization of impellers of centrifugal
Positive effect of applying hydrophobization technology to impeller surfaces in all the considered range of power speed coefficient was generalized and estimated It was shown that hydrophobization of impeller surfaces of centrifugal pumps provides increment to their efficiency factors within an acceptable operation range from 0 5 to 7 5
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Pump Performance Curves and Similarity Laws
impeller diameter D Used to predict the new pump power BHP for a design change in fluid ρ pump speed N and impeller diameter D Example It is desired to modify the operating conditions for the 38 in diameter impeller pump of Fig 11 7b to a new pump speed of 900 rpm and a larger impeller diameter of 40 in Determine the new pump head and
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Basic Practices in Compressors Selection
in the impeller However cost and pressure losses limit the numbel of blades that can be used in an impeller Flow Coefficfent The flow coefficient is a non dimensional unit which takes flow Q into consideration for a given tip speed U and impeller diameter It is defined as Where J1 = 700Q N n3
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Back to Basics Selecting a Centrifugal Compressor
impeller flow coefficient The flow coefficient relates an ϕ impeller s volumetric flow capacity Q operating speed N and exit diameter D2 Q ND 1 2 ϕ = 3 Lowflowcoefficient impellers are characterized by long narrow passages while highflowcoefficient impel lers have much wider passages to accommodate the higher flowrates
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INVESTIGATIONS ON THE DYNAMIC COEFFICIENTS OF
larger than the quantity of the effect of interest impeller coefficients From the bearing and seal coefficient survey as published by Kocur et al 2007 the authors feel some endorsement for their reservations that the uncertainty of the first order effects oil bearings balance drum labyrinth and hole pattern seal coefficients needs to be
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Linear Coefficient Power Coefficient for Power Law
Mar 16 2020 Power Curve Fitting Approach Using experimental data for pressure versus velocity we can extract the coefficients For example let s take a 0 01 meters thick perforated plate and water as fluid The following case was simulated in SimScale at 6 different velocities
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POWER CORRELATION FOR ANCHOR AND HELICAL RIBBON
the blade width and the impeller diameter The in fluence on power of the distance of the impeller from the lid is proved to be negligible This correlation can be used for anchor as well as helical ribbon impel lers and shows good agreement with experimental data Nomenclature CD = drag coefficient c = clearance between impeller and vessel
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NEW CHALLENGES AND DESIGN FOR HIGH MACH HIGH
The design of large flow coefficient high specific Mach number impeller is a constant area of OEM investment The design optimization for these impeller families has historically benefit of the increasing usage of CFD tool and advance validation and measurements methods
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Pump Performance Curves and Similarity Laws
Used to predict the new pump power BHP for a design change in fluid pump speed N and impeller diameter D Example It is desired to modify the operating conditions for the 38 in diameter impeller pump of Fig 11 7b to a new pump speed of 900 rpm and a larger impeller diameter of 40 in
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Flow Coefficient and Work CoefficientConcepts NREC
Flow Coefficient and Work Coefficient by Mark R Anderson on Mar 22 2018 12 00 25 PM Two often used quantities to characterize turbomachinery are flow coefficient and work coefficient The two are generally represented as Φ for flow coefficient and φ for work coefficient The mathematical definition for the two quantities are as follows
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Design and optimization of a centrifugal pump s impeller
Table 1 1 Optimized geometrical parameters of the impeller Lastly the model is used to predict the pump performance of a large scale pump The main geometrical traits for a 1 MW pump are calculated and used in the model For major correlation between the small impeller and the large impeller the optimized values obtained for the small
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Experimental Study of Unshrouded Impeller Pump Stage
Impeller Head Coefficient Noncavitating Impeller Head Coefficient vs Normalized Impeller Flow/Speed Ratio 2 o m O o e3 1 0 70 0 65 0 60 0 55 0 50 A I T A A I T A T A I A I o 8 Average impeller head coefficient at design point 0 67 2 73 B2 0 6512 11 B2 0 5617 41 B2 J b 0 8 W 0 45 0 40 0 50 Speed = 3000 rpm Design Impeller Flow/Speed
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Low Flow Coefficient Centrifugal Compressor Design for
coefficients then becomes similar to that of centrifugal pumps A useful parameter is the ratio of the non dimensional impeller outlet width to the flow coefficient b2 = b2/R /φ 1 labyrinth seals are in line with best practices and the which is of course directly related to the outlet flow coefficient of the stage cm/U Typical high flow
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The Impeller Exit Flow Coefficient As a Performance Map
Jun 26 2017 Abstract A multi stage centrifugal compressor model is presented with emphasis on analyzing use of an exit flow coefficient vs an inlet flow coefficient performance parameter to predict off design conditions in the critical region of a supercritical carbon dioxide CO 2 power cycle A description of the performance parameters is given along with their implementation in a design model
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FLUID MECHANICS TUTORIAL No 8B CENTRIFUGAL PUMPS
Power Coefficient Specific Speed Explain how to match a pump to system requirements 100 bore diameter and has a friction coefficient of 0 003 The pump impeller is 500 mm diameter and revolves at 600 rev/min The pump is geometrically similar to another pump with an impeller 550 mm diameter which gave the data
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A novel centrifugal impeller bioreactor II Oxygen
Sep 05 1996 The effects of the impeller configuration aeration rate and agitation speed on oxygen transfer coefficient K L a were studied in a newly designed centrifugal impeller bioreactor 5‐L The oxygen transfer rates in the novel bioreactor were also compared with those in a cell‐lift bioreactor with comparable dimensions
Get PriceA Hydraulic Performance Comparison of Centrifugal Pump
Sep 26 2020 Up to10 cash back The modifications of impeller may show diverse impact on centrifugal pump operating in pump and turbine modes To clarify this problem the hydraulic performance of a low specific speed centrifugal pump operating in both modes was firstly obtained by CFD method and verified by experiment Then based on the single factor design method a series of calculations have
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Shop Maytag High Efficiency Top Load with Power Impeller
THIS COLLECTION IS CURRENTLY UNAVAILABLE 21403 Maytag 4 3 cu ft High Efficiency Impeller Top Load Washer White Maytag 4 3 cu ft High Efficiency Impeller Top Load Washer White 8543 Maytag 7 0 cu ft Vented Electric Dryer with Sanitize CycleWhite
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