Fluidization and Flow Properties of Fine Cohesive Powders
A special issue of Materials (ISSN 1996-1944).
Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 13742
Special Issue Editor
Interests: fluidization; energy; fine cohesive powders; biomass; heterogeneous catalysis; CO2 capture; thermochemical energy storage; concentrated solar power; hydrogen
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Special Issue Information
Dear Colleagues,
The Special Issue, “Fluidization and Flow Properties of Fine Cohesive Powders”, will address experimental/theoretical research and latest progress in the science and technology of fluidization and flow behavior of fine/ultrafine particles.
Fine powders, down to ultrafine or nanopowders, have attracted growing attention in recent years in both the industrial and academic sectors due to their new chemical, physical, and mechanical characteristics, mainly deriving from their very small primary particle size and large surface area-to-volume ratio. Indeed, they can provide better contact efficiency and higher reaction rates per unit volume of reactor than traditional materials in the case of fluid/solid and solid/solid reactions. Moreover, fine powders find applications in a variety of industrial sectors, such as the production of sorbents, catalysts, cosmetics, drugs, food, medicines, plastics, biomaterials, metal mixtures, metal foams, and microelectromechanical systems.
Therefore, the interest in using this type of granular materials raises many questions around how they can be handled and processed in large-scale applications. In this framework, fluidization is one of the most effective available techniques in ensuring continuous powder handling and dispersion characterized by good heat and mass transfer coefficients. However, fluidization of fine powders is very challenging (i.e., characterized by plug formation, channeling, and agglomeration) due to their intrinsic cohesive nature deriving from strong interparticle forces, such as van der Waals, electrostatic, and moisture-induced surface tension forces. In particular, interparticle forces are closely related to powder flowability, a complex of different characteristics generally adopted for measuring the ability of a powder to flow under specified conditions. The powder’s flow behavior is not an inherent property of the material but depends on both intrinsic material properties and bulk powder properties, as well as on processing conditions. Therefore, understanding the fundamental mechanism and developing technological solutions able to ensure the feasibility of fine cohesive powders fluidization and good powder flowability are required for efficient large-scale powder processing.
Original papers are solicited on experimental/theoretical studies on fluidization of cohesive powders. Of particular interest are recent developments in technologies able to ensure a proper fluidization regime of fine powders and their applications in chemical and industrial processes. Articles dealing with fundamental aspects of powder flow behavior, also highlighting the complex link between local particles interactions and their fluidization behavior, and with methods to predict and improve powder flowability are very welcome.
Dr. Paola AmmendolaGuest Editor
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Keywords
- Fine particles
- Nanoparticles
- Cohesiveness
- Fluidization
- Flowability
- Interparticle forces (IPFs)
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