Papers by Andrea Claudio Santomaso
Chemical Engineering Science, 2022
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Waste Management, Dec 1, 2015
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Chemical engineering research & design, Jul 1, 2020
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Royal Society of Chemistry eBooks, 2019
This chapter provides a review of the state of the art apparatus and procedures for the character... more This chapter provides a review of the state of the art apparatus and procedures for the characterisation of powder flow properties. Classified according to the relevant state of consolidation, their measurement principles and the consequent procedure for different powder flow properties are described in detail. In addition, major available commercial devices are introduced, discussed and summarised based on the powder flow properties that can be measured. Finally, a comparison between the main features of different measurement methods with reference to the relevant powder consolidation, suitable usage, availability of standardised procedures and ease of self-construction of the rig is provided
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Powder Technology, Oct 1, 2018
Abstract Dry mixing is a common operation in many industrial processes. The unloading of the mixe... more Abstract Dry mixing is a common operation in many industrial processes. The unloading of the mixer is an essential aspect of the process which actively contributes to the final quality of the mixture. Its effect however is often underestimate or even ignored. In the present work the consequences of the unloading process on mixture quality were investigated in three different types of tumbling mixers: a symmetric double cone, an asymmetric double cone and a conic mixer were considered. The symmetric double cone mixer is a standard geometry in the pharmaceutical industry, while the other two geometries are unconventional. The effects of mixer geometry on the mixture quality were studied and related to differences in the unloading flow patterns. A segregating polydispersed mixture was used during the experiments in order to emphasize the different performances of the three tumblers. Additional quasi-2D experiments and FEM simulation of the unloading process clearly showed the ability of the unconventional geometries to mitigate the effect of segregation improving the mixture quality evaluated at the outlet of the mixer.
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Particuology, Aug 1, 2021
Abstract Granular materials composed of different-sized grains may experience undesired segregati... more Abstract Granular materials composed of different-sized grains may experience undesired segregation. Segregation is detrimental for a lot of industries because it leads to an increase in production costs and wastes. For these reasons, the segregation phenomena have been intensively studied in the last decades, and a lot of models have been provided by many researchers. However, these models are mainly based on empirical relations rather than physical considerations. This paper aims to confirm the main assumptions made by Volpato, Tirapelle, and Santomaso (2020) in their percolation theory by means of DEM simulations. The simulated geometry is a tilting shear box filled with few tracer particles in a bed of coarser sized grains, and simulations are performed for a range of tilting frequencies and size ratios. The results provide meaningful insight on the mathematical model parameters and allow us to say that the percolation theory relies on physically consistent assumptions.
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Royal Society of Chemistry eBooks, 2019
This chapter provides a review of the state of the art apparatus and procedures for the character... more This chapter provides a review of the state of the art apparatus and procedures for the characterisation of powder flow properties. Classified according to the relevant state of consolidation, their measurement principles and the consequent procedure for different powder flow properties are described in detail. In addition, major available commercial devices are introduced, discussed and summarised based on the powder flow properties that can be measured. Finally, a comparison between the main features of different measurement methods with reference to the relevant powder consolidation, suitable usage, availability of standardised procedures and ease of self-construction of the rig is provided.
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Powder Technology, Nov 1, 2019
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Physical review, Jul 9, 2020
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arXiv (Cornell University), Sep 1, 2018
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Papers by Andrea Claudio Santomaso