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(PDF) Mixing in a Fluid Jet Agitated Tank: Geometric Effects

An improvement in mixing time was observed when a hemispherical base was used instead of a flat base. The mixing time reduced by about 25% for a jet Reynolds number of 9000, and by

Mixing Design for Air Agitated Rectangular Tanks Water

Design equations have been developed to estimate liquid velocities and mixing times in air agitated tanks. Determination of the gas rate necessary for adequate agitation in a given geometry is possible with this information. Air agitation offers benefits of increased dissolved oxygen and cost effective mixing for some waste water treatment

Fluid mechanics and blending in agitated tanks ScienceDirect

1991-1-1  The results of this flow model were then used to simulate the mixing of an inert tracer (introduced in pulse mode) in agitated tanks. Various mixing time definitions were studied and compared with published correlations. Some numerical experiments were performed to generate guidelines for the development of new impellers. l~ S5 t o o U p0~~ i

Mixing in Liquid-Jet-Agitated Tanks: Effects of Jet

2019-5-25  Mixing in liquid-jet-agitated tanks has been studied experimentally and numerically. A bottom-pump-around tank with a symmetric jet and another with an asymmetric jet arrangement were used. Conductivity was experimentally measured to determine the time required to achieve 95% mixing. Good agreement was obtained between the experimental and numerical results over a wide range of

MIXING TIME IN UNBAFFLED STIRRED TANKS

2012-8-14  Mixing time (tmix) is the main parameter commonly employed to assess the mixing performance of single phase stirred tanks. It is defined as the time required to obtain a given level of homogeneity in an initial non-homogeneous mixture. Several mixing time measuring techniques have been proposed over the years.

Fluid mixing and gas dispersion in agitated tanks

This book covers the essentials of fluid mechanics and explains how to apply fundamental principles to achieve optimum time and capacity efficiency with a minimum of waste. Individual chapters are devoted to the mixing tank, power consumption in turbulent flow, power consumption in viscous creeping flow, mixing in turbulent agitated tanks, and laminar mixing and gas dispersion in agitated tanks.

(PDF) Laminar Mixing in Stirred Tank Agitated by an

Numerous research reports have been published on the mixing times of stirred tanks with other types of impellers. The mixing time in a stirred tank can be measured experimentally using the

Turbulent mixing in baffled stirred tanks with vertical

Mixing time and power consumption have been measured in baffled, paddle-agitated cylindrical tanks with single- and double-impellers, and mixing efficiency has been defined by a reciprocal of the product of the mixing time and power consumption. The mixing efficiency and mixing time of double-impeller agitation have been compared with those of

Control of the mixing time in vessels agitated by

2018-1-24  Jet mixing is commonly employed in large-scale tanks where the required blend time of the tanks is more in the order of hours rather than minutes or seconds. Therefore, jet mixing is ideal for anaerobic digesters, fuel storage tanks, etc. with hydraulic retention times in the order of days.

CFD simulation of local and global mixing time in an

2017-1-14  The Issue of mixing efficiency in agitated tanks has drawn serious concern in many industrial processes. The turbulence model is very critical to predicting mixing process in agitated tanks. On the basis of computational fluid dynamics(CFD) software package Fluent 6.2, the mixing characteristics in a tank agitated by dual six-blade-Rushton-turbines(6-DT) are predicted using the detached eddy

Control of the mixing time in vessels agitated by

Submerged recirculating jet mixing systems are an efficient and economical method of agitating large tanks with a high hydraulic residence time. Much work has been carried out in developing design correlations to aid the predictions of the mixing time in such systems, with the first such correlation

Control of the mixing time in vessels agitated by

Submerged recirculating jet mixing systems are an efficient and economical method of agitating large tanks with a high hydraulic residence time. Much work has been carried out in developing design

MIXING TIME IN UNBAFFLED STIRRED TANKS

2012-8-14  Mixing time (tmix) is the main parameter commonly employed to assess the mixing performance of single phase stirred tanks. It is defined as the time required to obtain a given level of homogeneity in an initial non-homogeneous mixture. Several mixing time measuring techniques have been proposed over the years.

(PDF) Laminar Mixing in Stirred Tank Agitated by an

Numerous research reports have been published on the mixing times of stirred tanks with other types of impellers. The mixing time in a stirred tank can be measured experimentally using the

Turbulent mixing in baffled stirred tanks with vertical

Mixing time and power consumption have been measured in baffled, paddle‐agitated cylindrical tanks with single‐ and double‐impellers, and mixing efficiency has been defined by a reciprocal of the product of the mixing time and power consumption. The mixing efficiency and mixing time of double‐impeller agitation have been compared with

Scalar mixing measurements in batch operated stirred tanks

2009-3-27  An LIF technique was used to obtain unobtrusive measurements of scalar concentration as a function of time and mixing times in a fully baffled batch operated mixing vessel agitated by five forms of impeller (Rushton, ‘bucket’, six bladed 45°‐and 60°‐pitched blade, hyperboloid).

A GUIDE TO OPTIMIZING IN-TANK AGITATION

2021-4-15  TANK MIXING EDUCTOR BENEFITS • Ensures homogeneous fluid mix throughout the tank More thorough mixing results in solution uniformity temperature, pH level, solids/gas dispersion and chemical distribution to help ensure product/process quality Eliminates sludge build-up and reduces tank cleaning time

SCALE-UP OF MIXING SYSTEMS

2011-5-4  objectives such as the time required for blending two immiscible liquids, rates of heat transfer from a heated jacket per unit volume of the agitated liquid, and mass transfer rate from gas bubbles dispersed by agitation in a liquid. For all these objectives, the process results are to achieve the optimum mixing and uniform blending. mixing of

Turbulent mixing in baffled stirred tanks with vertical

Mixing time and power consumption have been measured in baffled, paddle‐agitated cylindrical tanks with single‐ and double‐impellers, and mixing efficiency has been defined by a reciprocal of the product of the mixing time and power consumption. The mixing efficiency and mixing time of double‐impeller agitation have been compared with

Control of the mixing time in vessels agitated by

Submerged recirculating jet mixing systems are an efficient and economical method of agitating large tanks with a high hydraulic residence time. Much work has been carried out in developing design correlations to aid the predictions of the mixing time in such systems, with the first such correlation

Control of the mixing time in vessels agitated by

Submerged recirculating jet mixing systems are an efficient and economical method of agitating large tanks with a high hydraulic residence time. Much work has been carried out in developing design

SCALE-UP OF MIXING SYSTEMS

2011-5-4  objectives such as the time required for blending two immiscible liquids, rates of heat transfer from a heated jacket per unit volume of the agitated liquid, and mass transfer rate from gas bubbles dispersed by agitation in a liquid. For all these objectives, the process results are to achieve the optimum mixing and uniform blending. mixing of

Laminar Mixing in Stirred Tank Agitated by an Impeller

2012-7-12  The mixing performance in a vessel agitated by an impeller that inclined itself, which is considered one of the typical ways to promote mixing performance by the spatial chaotic mixing, has been investigated experimentally and numerically. The mixing time was measured by the decolorization method and it was found that the inclined impeller could reduce mixing time compared to that obtained

Mixing Time: A CFD Approach

2008-2-1  Mixing Time Mixing time is the time taken to homogenize the liquid contents of the tank after a step change in composition The transport of a tracer helps to understand the degree of homogeneity in the agitated tank Circulation time used to gauge the bulk motion induced by the impeller(s) Mixing (or blend) time can be used to evaluate the

Oxygen transfer and mixing in mechanically agitated

2002-3-26  Biochemical Engineering Journal 10 (2002) 143–153 Oxygen transfer and mixing in mechanically agitated airlift bioreactors Yusuf Chistia,∗, Ulises J. Jauregui-Hazab a Institute of Technology and Engineering, Massey University, Private Bag 11-222, Palmerston North, New Zealand b Centro de Qu´ımica Farmacéutica, 200 y 21 Atabey, Aptdo. 16042, Havana, Cuba

Fluid mechanics and blending in agitated tanks — Queen's

The results of this flow model were then used to simulate the mixing of an inert tracer (introduced in pulse mode) in agitated tanks. Various mixing time definitions were studied and compared with published correlations. Some numerical experiments were performed

AGITATED VESSEL HEAT TRANSFER

Agitated vessel heat transfer is commonly used in batch manufacture where it is frequently necessary to calculate the time to heat or cool a batch or the cooling capacity required to hold an exothermic or endothermic reaction at constant temperature.

SURFACE AERATION FOR WATER TREATMENT AGITATED TANK MIXING

A surface aeration and agitation system used for water treatment was studied under both aerated and non-aerated conditions to explain the influencing parameters on the mixing time. The power consumption measurement and lower propeller pumping capacity by applying (LDV) are performed. A dimensionless mixing time number model is made to correlate the most affecting factors for the system.