Physico-сhemical nanomaterials science
Theoretical basics of final drying of ammonium nitrate with nanoporous structure in gravitational shelf dryers
N.O. Artyukhovа1, J. Krmela2, V. Krmelova3
1Processes and Equipment of Chemical and Petroleum Refinery Department, Sumy State University, Rymskogo-Korsakova str.,  2, Sumy-40007, Ukraine. 
E-mail: n.artyukhova@pohnp.sumdu.edu.ua 
2Department of Numerical Methods and Computational Modeling, Alexander Dubcek University of Trencin, 491/30, I. Krasku, 02001, Puchov, Slovak Republic
E-mail: jan.krmela@fpt.tnuni.sk 

3 Department of Materials Technologies and Environment, Alexander Dubcek University of Trencin, 491/30, I. Krasku, 02001, Puchov, Slovak Republic
E-mail: vladimira.krmelova@fpt.tnuni.sk 

The article is devoted to the study of the theoretical basics of convective drying of porous ammonium nitrate granules with nanostructured porous layers in multistage gravitational devices ,2. A theoretical description of the drying kinetics of porous ammonium nitrate granules with nanoporous layers was presented. 
The calculation of the drying process by the mass transfer equation has some peculiarities because there is an interconnected heat transfer in the drying objects: removal of moisture and simultaneous heating of the wet material. The relationship between these processes is because mass transfer coefficients depend on temperature, and thermal ones on the concentration of moisture in the material.
This work was carried out under the project “Technological bases of multistage convective drying in small-sized devices with utilization and heat recovery units”, project No. 0120U100476.

1.	Artyukhova N.O. Multistage finish drying of the N4HNO3 porous granules as a factor for nanoporous structure quality improvement // Journal of Nano- and Electronic Physics. – 2019. – 10 (3), P. 03030-1-03030-5 (2018).
2.	Artyukhova N.O, Krmela J. Nanoporous structure of the ammonium nitrate granules at the final drying: The effect of the dryer operation mode // Journal of Nano- and Electronic Physics. – 2019. – 11(4). – P. 04006-1-04006-4.