English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Screw conveyors can be used either as independent conveyor systems or as a part of a production line, for example in lime, cement, energy, food, or agricultural industry plants. Screw conveyors have two key advantages: a simple construction and easy adjustment of their efficiency for a given application. However, the behavior of bulk materials during the transportation by a screw conveyor is a very complicated process, dependent on a number of factors, such as rotational speed of the screw, filling rate, or physical properties of the transported material. Up-to-date methods of designing screw conveyors are based on the algorithm which takes into consideration characteristic dimensions of a screw, rotational speed of a shaft, bulk density, and empirical coefficients characteristic for a given bulk material [15, 19]. In the case of standard bulk materials, such as limestone or cement, these methods allow the design of fully-functioning conveyors; however, in the case of, for example, highly abrasive, fragile or strongly cohesive materials, traditional methods of designing do not give satisfactory results. As a consequence, the devices are usually oversized and face difficulties in reaching the required performance. This is why, the identification of physical properties of the transported material is vital while designing this kind of devices. What is more, as it was demonstrated in [18], the efficiency of a screw conveyor is strongly correlated with the properties of the transported bulk material. For this reason, the designs of screw conveyors are very frequently based on the past experience in designing and exploitation of the designers [2]. Currently, the designers are able to choose geometrical and exploitation parameters of the screw conveyors with the use of the simulation tools, which allow the examination of the behavior of a bulk material during the transportation by a screw conveyor. Usually, the behavior of bulk materials is simulated with the use of the Discrete Element Method (DEM). It allows the determination of a conveyor’s operating parameters, such as the mass efficiency and the power demand. However, in order to reflect the behavior of a bulk material during the transportation by a screw conveyor and, as a result, obtain reliable results of the simulation, it is inevitable to determine precisely the material parameters which describe the DEM model, based on actual physical properties of the transported bulk material. Since many years, screw conveyors have been a subject of simulation studies with the use of DEM method. Numerous studies discussed the verification of the computational model with regard to the efficiency of the conveyor. The authors of [11] showed a good agreement between the results of mass efficiency determined in the DEM simulation and in the experimental study of an “OLDS” elevator (a special case of a screw conveyor, in which the trough rotates around the fixed screw, causing axial movement of the material). In the paper [13] the authors present the results of laboratory tests, computer simulations, and theoretical calculations of the mass efficiency of a screw conveyor in relation to its rotational speed and the angle of inclination. It was proven that DEM analyses provide a good agreeSimulational and experimental determination of the exploitation parameters of a screw conveyor