The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
Saverio Randi - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
Nicola Aldi - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
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Centrifugal pumps performance estimation with non-Newtonian Fluids: review and critical analysis
12th European Conference on Turbomachinery Fluid Dynamics and hermodynamics, 2017Co-Authors: Carlo Buratto, Nicola Aldi, Nicola Casari, Matteo Occari, Michele Pinelli, Pier Ruggero Spina, Alessio SumanAbstract:Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved, such as food industry and oil&gas applications, producing the pump performance derating. In order to give an overview of pros, cons of the different analytical approaches for pump performance derating a literature review on the most significant advances in this topic will be carried out. Moreover to deepen the knowledge about the internal flow and rheological behavior inside the centrifugal pumps working with non-Newtonian Fluids, a detailed CFD analysis of two different pumps will be carried out. The analysis will be focus on the apparent viscosity correction involved in the performance derating with analytical methods and the effects of different types of fluid. Moreover the comparison of the results with two pumps with very different typology, field of application, and dimensions will help to generalize the meaning of the analysis.
Chunying Zhu - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation of the interactions between three equal-interval parallel bubbles rising in non-Newtonian Fluids
Chemical Engineering Science, 2013Co-Authors: Jingru Liu, Chunying ZhuAbstract:The motion and interactions of three equal-interval parallel bubbles in non-Newtonian Fluids were numerically simulated by volume of fluid method (VOF), in which the continuous surface tension model and the power-law model were adopted to represent surface tension and rheological properties of non-Newtonian Fluids, respectively. The computational method was validated by the comparison of the processes of coalescence of two in-line bubbles and rising of two parallel bubbles between experiment and simulation. This method was then applied to study the effect of initial bubble diameter, initial horizontal bubble interval and rheological properties of non-Newtonian Fluids on lateral coalescence and rising of three parallel bubbles. The dimensionless critical horizontal interval of bubble coalescence was obtained under different physical property conditions. The critical horizontal interval of bubble coalescence decreases with the increase of initial bubble diameter and flow index of non-Newtonian Fluids. When the initial horizontal bubble interval is less than the critical horizontal interval of bubble coalescence, three bubbles will coalesce into a bigger bubble. The coalescing bubble could breakup into two identical daughter bubbles when the initial bubble diameter was increased or the flow index of non-Newtonian Fluids was decreased. Three parallel bubbles rising in non-Newtonian Fluids will experience repulsive interactions once the initial horizontal bubble interval is greater than the critical horizontal interval of bubble coalescence, the horizontal bubble interval increased gradually owing to the repulsive effect, while the vertical distance between bubbles varied dramatically for spherical bubble and ellipsoidal bubble due to the differences of their flow field structures.
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Breakup dynamics of slender bubbles in non-Newtonian Fluids in microfluidic flow-focusing devices
AIChE Journal, 2012Co-Authors: Denis Funfschilling, Chunying ZhuAbstract:This study aims to investigate the breakup of slender bubbles in non-Newtonian Fluids in microfluidic flow-focusing devices using a high-speed camera and a microparticle image velocimetry (micro-PIV) system. Experiments were conducted in 400- and 600-mu m square microchannels. The variation of the minimum width of gaseous thread with the remaining time before pinch-off could be scaled as a power-law relationship with an exponent less than 1/3, obtained for the pinch-off of bubbles in Newtonian Fluids. The velocity field and spatial viscosity distribution in the liquid phase around the gaseous thread were determined by micro-PIV to understand the bubble breakup mechanism. A scaling law was proposed to describe the size of bubbles generated in these non-Newtonian Fluids at microscale. The results revealed that the rheological properties of the continuous phase affect significantly the bubble breakup in such microdevices
Carlo Buratto - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
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Centrifugal pumps performance estimation with non-Newtonian Fluids: review and critical analysis
12th European Conference on Turbomachinery Fluid Dynamics and hermodynamics, 2017Co-Authors: Carlo Buratto, Nicola Aldi, Nicola Casari, Matteo Occari, Michele Pinelli, Pier Ruggero Spina, Alessio SumanAbstract:Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved, such as food industry and oil&gas applications, producing the pump performance derating. In order to give an overview of pros, cons of the different analytical approaches for pump performance derating a literature review on the most significant advances in this topic will be carried out. Moreover to deepen the knowledge about the internal flow and rheological behavior inside the centrifugal pumps working with non-Newtonian Fluids, a detailed CFD analysis of two different pumps will be carried out. The analysis will be focus on the apparent viscosity correction involved in the performance derating with analytical methods and the effects of different types of fluid. Moreover the comparison of the results with two pumps with very different typology, field of application, and dimensions will help to generalize the meaning of the analysis.
Matteo Occari - One of the best experts on this subject based on the ideXlab platform.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
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Experimental and Numerical Analysis of a Non-Newtonian Fluids Processing Pump
Energy Procedia, 2017Co-Authors: Nicola Aldi, Carlo Buratto, Nicola Casari, Devid Dainese, Matteo Occari, Enrico Munari, Michele Pinelli, Francesco Mollica, Valentina Mazzanti, Saverio RandiAbstract:Abstract Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved: food processing industry, pharmaceutical and oil/gas applications. In addition to pressure and temperature, the viscosity of a non-Newtonian fluid depends on the shear rate and usually is several orders of magnitude higher than water. High values of viscosity cause a derating of pump performance with respect to water. Nowadays, pumping and mixing non-Newtonian Fluids is a matter of increasing interest, but there is still lack of a detailed analysis of the fluid-dynamic phenomena occurring within these machines. A specific design process should take into account these effects in order to define the proper pump geometry, able to operate with non-Newtonian Fluids with specific characteristics. Only few approaches are available for correcting the pump performance based on the Hydraulic Institute method. In this work, an experimental and numerical campaign is presented for a semi–open impeller centrifugal pump elaborating non-Newtonian Fluids. An on-purpose test bench was built and used to investigate the influence on pump performance of three different non-Newtonian Fluids. Each pump performance test was accompanied by the rheological characterization of the fluid, in order to detect modifications of the rheological phenomena and allow a proper Computation Fluid Dynamics (CFD) modeling. The performance of the machine handling both Newtonian and non-Newtonian Fluids are highlighted in relation with the internal flow field.
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Centrifugal pumps performance estimation with non-Newtonian Fluids: review and critical analysis
12th European Conference on Turbomachinery Fluid Dynamics and hermodynamics, 2017Co-Authors: Carlo Buratto, Nicola Aldi, Nicola Casari, Matteo Occari, Michele Pinelli, Pier Ruggero Spina, Alessio SumanAbstract:Centrifugal pumps are used in many applications in which non-Newtonian Fluids are involved, such as food industry and oil&gas applications, producing the pump performance derating. In order to give an overview of pros, cons of the different analytical approaches for pump performance derating a literature review on the most significant advances in this topic will be carried out. Moreover to deepen the knowledge about the internal flow and rheological behavior inside the centrifugal pumps working with non-Newtonian Fluids, a detailed CFD analysis of two different pumps will be carried out. The analysis will be focus on the apparent viscosity correction involved in the performance derating with analytical methods and the effects of different types of fluid. Moreover the comparison of the results with two pumps with very different typology, field of application, and dimensions will help to generalize the meaning of the analysis.
