On the heat in the nozzle of the industrial pneumatic pulsator

Abstract

An industrially applicable nozzle is the subject of this study. The nozzle is an auxiliary equipment of a pneumatic pulsator system for unclogging outlets of silos which store loose materials. The aim is to determine the amount of heat which is generated during one work cycle of the system. Investigation in this field has not been carried out so far, and the present-day designing process is significantly based on heuristic knowledge. The heat is calculated by using results of a numerical simulation. The Finite Volume Method has been used with a thermodynamically ideal gas model. The airflow is assumed to be transient, compressible and supersonic, and it is driven by a time-varying pressure difference. There is an estimation of discretization error of the numerical results carried out in order to confirm the reliability of the solution. The error estimation shows that the results lie in the vicinity of the exact solution of the governing equations. Instantaneous results of the simulation indicate a locally flow which intensifies flow parameters in a similar way as the convergingdiverging nozzles do. The value of the total heat generated during gas conversion within the nozzle is negative; thus, the nozzle could be cooled during its functioning.

On the energy efficiency in the heatproof nozzle of the pneumatic pulsator system during supersonic airflow

“…But they do not consider nozzles applied in heavy industry in which the flow phenomena are not obvious. The study of this type of the nozzle has been reported in [8] and there were attempts to optimize the airflow through it in 2-D [9] and 3-D [10]. The present study broadens knowledge on the supersonic flow in the channel with non-constant cross-section area where obstacles are present.…”

Testing the thermal properties of modern ventilated facade fastening systems

“…Numerical simulations were performed for a normal predefined mesh size. The methodology of sensitivity analysis was taken from 19 and 20 .…”

Phase Structure Evolution of the Fe-Al Arc-Sprayed Coating Stimulated by Annealing

“…They are significantly resistant to oxidation, carburizing, and sulfation at high temperatures (up to 900 • C) [17,18]. Additionally, they are highly resistant to erosion [19] and cavitation [20,21], and have relatively low density and low prices compared to corrosion-resistant [22,23] and acid-resistant steel [24], which require application expensive elements, such as Cr, Ni, Mo [25][26][27]. The intermetallics owe their special properties to their ordered structures with strong chemical bonds and simultaneous dense packing of atoms in crystal lattices, which leads to reduced diffusion velocity, creep resistance, and resistance to high-temperature corrosion [28][29][30][31].…”