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Andrzej W Pacek - One of the best experts on this subject based on the ideXlab platform.

  • flow pattern periodicity and energy dissipation in a batch rotor stator mixer
    Chemical Engineering Research & Design, 2008
    Co-Authors: Adi T Utomo, Michael Baker, Andrzej W Pacek
    Abstract:

    Abstract The flow pattern and the distribution of energy dissipation rate in a batch rotor–stator mixer have been investigated. Sliding mesh and standard k–ɛ turbulence model were employed to predict velocity and energy dissipation rate distributions verified experimentally by the Laser Doppler Anemometry measurements. The agreement between predicted and measured bulk flow field as well as the flow pattern of jets emerging from the stator holes was very good. Results showed that the periodicity of the jet can be related to the rotor's velocity and number of blades. The energy balance based on measured velocity distribution indicated that about 70% of energy is dissipated in close proximity to the Mixing Head. Both simulation and measurement showed that the jet velocity and flowrate through the holes were proportional to N while the energy dissipation rate scaled with N3.

  • Flow pattern, periodicity and energy dissipation in a batch rotor–stator mixer
    Chemical Engineering Research and Design, 2008
    Co-Authors: Adi T Utomo, Michael Baker, Andrzej W Pacek
    Abstract:

    Abstract The flow pattern and the distribution of energy dissipation rate in a batch rotor–stator mixer have been investigated. Sliding mesh and standard k–ɛ turbulence model were employed to predict velocity and energy dissipation rate distributions verified experimentally by the Laser Doppler Anemometry measurements. The agreement between predicted and measured bulk flow field as well as the flow pattern of jets emerging from the stator holes was very good. Results showed that the periodicity of the jet can be related to the rotor's velocity and number of blades. The energy balance based on measured velocity distribution indicated that about 70% of energy is dissipated in close proximity to the Mixing Head. Both simulation and measurement showed that the jet velocity and flowrate through the holes were proportional to N while the energy dissipation rate scaled with N3.

Adi T Utomo - One of the best experts on this subject based on the ideXlab platform.

  • Flow patterns and energy dissipation rates in batch rotor-stator mixers
    2009
    Co-Authors: Adi T Utomo
    Abstract:

    The flow pattern and distribution of energy dissipation rate in a batch rotor-stator mixer fitted with disintegrating Head have been numerically investigated. Standard k-e turbulence model in conjunction with sliding mesh method was employed and the simulation results were verified by laser Doppler anemometry (LDA) measurements. The agreement between predicted and measured velocity profiles in the bulk and of jet emerging from stator hole was very good. Results showed that the interaction between stator and rotating blades generated periodic fluctuations of jet velocity, flowrate, torque and energy dissipation rate around the holes. The kinetic energy balance based on measured velocity distribution indicated that about 70% of energy supplied by the rotor was dissipated in close proximity to the Mixing Head, while the simulation predicted that about 60% of energy dissipated in the same control volume. Both simulations and measurements showed that jet velocity and total flowrate through holes were proportional to rotor speed, while the energy dissipation rate scaled with the cube of rotor speed. The effect of stator geometry on the flow pattern and energy dissipation rate was also numerically investigated using standard k-e model and sliding mesh method. The simulations showed that flow patterns in the holes were similar regardless of holes sizes and shapes, i.e. jets emerged in the proximity of the leading edge and they induced circulation flows behind them. The radial velocities of jets emerging from various stators plotted against normalized tangential coordinate were practically the same, however, jets tangential velocities were affected by hole width-to-depth ratio. Jets emerging from holes with large width to-depth ratio had negative tangential velocity component (the same as rotor rotation) while those from holes with small width-to-depth ratio had positive tangential velocity component (against rotor rotation). Jets emerging from stators with small hole spacing tended to merge and move tangentially, while those emerging from stators with large hole spacing tended to move radially as free jets. The power number correlated well with the total flowrate and the total flowrate correlated well with the total hole area. Both power number and flowrate were practically not affected by hole shape, hole spacing and stator thickness. For all stators investigated, high energy dissipation rate occurred in the regions around the leading and trailing edges due to stagnations in those regions. Stators with narrow holes generated more uniform energy dissipation rate profile around the holes than those with wide holes since the regions with high energy dissipation rate around the leading and trailing edges merged. The simulations also predicted that about 50 – 60% of total energy supplied by rotor was dissipated in the rotor swept volume regardless of stator geometries.

  • flow pattern periodicity and energy dissipation in a batch rotor stator mixer
    Chemical Engineering Research & Design, 2008
    Co-Authors: Adi T Utomo, Michael Baker, Andrzej W Pacek
    Abstract:

    Abstract The flow pattern and the distribution of energy dissipation rate in a batch rotor–stator mixer have been investigated. Sliding mesh and standard k–ɛ turbulence model were employed to predict velocity and energy dissipation rate distributions verified experimentally by the Laser Doppler Anemometry measurements. The agreement between predicted and measured bulk flow field as well as the flow pattern of jets emerging from the stator holes was very good. Results showed that the periodicity of the jet can be related to the rotor's velocity and number of blades. The energy balance based on measured velocity distribution indicated that about 70% of energy is dissipated in close proximity to the Mixing Head. Both simulation and measurement showed that the jet velocity and flowrate through the holes were proportional to N while the energy dissipation rate scaled with N3.

  • Flow pattern, periodicity and energy dissipation in a batch rotor–stator mixer
    Chemical Engineering Research and Design, 2008
    Co-Authors: Adi T Utomo, Michael Baker, Andrzej W Pacek
    Abstract:

    Abstract The flow pattern and the distribution of energy dissipation rate in a batch rotor–stator mixer have been investigated. Sliding mesh and standard k–ɛ turbulence model were employed to predict velocity and energy dissipation rate distributions verified experimentally by the Laser Doppler Anemometry measurements. The agreement between predicted and measured bulk flow field as well as the flow pattern of jets emerging from the stator holes was very good. Results showed that the periodicity of the jet can be related to the rotor's velocity and number of blades. The energy balance based on measured velocity distribution indicated that about 70% of energy is dissipated in close proximity to the Mixing Head. Both simulation and measurement showed that the jet velocity and flowrate through the holes were proportional to N while the energy dissipation rate scaled with N3.

A.j. Kowalski - One of the best experts on this subject based on the ideXlab platform.

  • Flow, turbulence and potential droplet break up mechanisms in an in-line Silverson 150/250 high shear mixer
    Chemical Engineering Science: X, 2020
    Co-Authors: C.j.u. Espinoza, Federico Alberini, Olga Mihailova, A.j. Kowalski, Mark J.h. Simmons
    Abstract:

    Abstract Angle resolved 2-D PIV measurements were performed to characterise the flow and turbulence as well as indicate potential droplet break up mechanisms in an in-line Silverson 150/250 high shear mixer, using water as the working fluid in the turbulent regime (120,000  e ∝ N b with b exponents of 1.59–1.90 (DE) and 2.42–2.84 (SGS), which are comparable to existing literature values. The influence on e of the rotor speed, external pump flow rate and induced backpressure on the mixer outlet, were also investigated. Analysis revealed that the intensity and propensity of e is dictated by the dominant flow in the Mixing Head e.g. radial flow at high pump flow rates, prominent in ROI A or tangential flow at high rotor speeds and when backpressure is induced, prominent in ROI B.

  • Flow studies in an in-line Silverson 150/250 high shear mixer using PIV
    Chemical Engineering Research and Design, 2018
    Co-Authors: C.j.u. Espinoza, Mark J.h. Simmons, Federico Alberini, Olga Mihailova, D. Rothman, A.j. Kowalski
    Abstract:

    Abstract Angle resolved 2-D PIV measurements were taken of the flow inside an in-line Silverson 150/250 high shear mixer, facilitated by a custom built transparent poly methyl methacrylate Mixing Head. Water was used as the working fluid in the turbulent regime (120,000

Mark J.h. Simmons - One of the best experts on this subject based on the ideXlab platform.

  • Flow, turbulence and potential droplet break up mechanisms in an in-line Silverson 150/250 high shear mixer
    Chemical Engineering Science: X, 2020
    Co-Authors: C.j.u. Espinoza, Federico Alberini, Olga Mihailova, A.j. Kowalski, Mark J.h. Simmons
    Abstract:

    Abstract Angle resolved 2-D PIV measurements were performed to characterise the flow and turbulence as well as indicate potential droplet break up mechanisms in an in-line Silverson 150/250 high shear mixer, using water as the working fluid in the turbulent regime (120,000  e ∝ N b with b exponents of 1.59–1.90 (DE) and 2.42–2.84 (SGS), which are comparable to existing literature values. The influence on e of the rotor speed, external pump flow rate and induced backpressure on the mixer outlet, were also investigated. Analysis revealed that the intensity and propensity of e is dictated by the dominant flow in the Mixing Head e.g. radial flow at high pump flow rates, prominent in ROI A or tangential flow at high rotor speeds and when backpressure is induced, prominent in ROI B.

  • Flow studies in an in-line Silverson 150/250 high shear mixer using PIV
    Chemical Engineering Research and Design, 2018
    Co-Authors: C.j.u. Espinoza, Mark J.h. Simmons, Federico Alberini, Olga Mihailova, D. Rothman, A.j. Kowalski
    Abstract:

    Abstract Angle resolved 2-D PIV measurements were taken of the flow inside an in-line Silverson 150/250 high shear mixer, facilitated by a custom built transparent poly methyl methacrylate Mixing Head. Water was used as the working fluid in the turbulent regime (120,000

C.j.u. Espinoza - One of the best experts on this subject based on the ideXlab platform.

  • Flow, turbulence and potential droplet break up mechanisms in an in-line Silverson 150/250 high shear mixer
    Chemical Engineering Science: X, 2020
    Co-Authors: C.j.u. Espinoza, Federico Alberini, Olga Mihailova, A.j. Kowalski, Mark J.h. Simmons
    Abstract:

    Abstract Angle resolved 2-D PIV measurements were performed to characterise the flow and turbulence as well as indicate potential droplet break up mechanisms in an in-line Silverson 150/250 high shear mixer, using water as the working fluid in the turbulent regime (120,000  e ∝ N b with b exponents of 1.59–1.90 (DE) and 2.42–2.84 (SGS), which are comparable to existing literature values. The influence on e of the rotor speed, external pump flow rate and induced backpressure on the mixer outlet, were also investigated. Analysis revealed that the intensity and propensity of e is dictated by the dominant flow in the Mixing Head e.g. radial flow at high pump flow rates, prominent in ROI A or tangential flow at high rotor speeds and when backpressure is induced, prominent in ROI B.

  • Flow studies in an in-line Silverson 150/250 high shear mixer using PIV
    Chemical Engineering Research and Design, 2018
    Co-Authors: C.j.u. Espinoza, Mark J.h. Simmons, Federico Alberini, Olga Mihailova, D. Rothman, A.j. Kowalski
    Abstract:

    Abstract Angle resolved 2-D PIV measurements were taken of the flow inside an in-line Silverson 150/250 high shear mixer, facilitated by a custom built transparent poly methyl methacrylate Mixing Head. Water was used as the working fluid in the turbulent regime (120,000