caa a22 4500 606170464 CHVBK 20210128100717.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10098-015-0931-z doi (NATIONALLICENCE)springer-10.1007/s10098-015-0931-z Numerical simulation of spray drying of hydroxyapatite nanoparticles [Elektronische Daten] [Wittaya Julklang, Boris Golman] As a way of improving handling safety of nanoparticles for environmental applications on an industrial scale, we considered the consolidation of nanoparticles into micron-sized spray-dried agglomerates. Spray drying has recently been favored for manufacturing of nanoparticle agglomerates including hydroxyapatite-based composites. This study numerically investigated the drying mechanism of the slurry of hydroxyapatite nanoparticles in an industrial-scale spray dryer. The detailed model of drying kinetics of a slurry droplet was combined with the energy, mass, and momentum balances of drying air and droplets in the dryer chamber. The results were compared to drying of silica nanoparticles. The simulation analysis exposed dissimilarities between drying mechanisms of hydroxyapatite and silica slurry droplets. Hydroxyapatite droplets required longer drying times. Higher drying air temperature and lower humidity were detected in the chamber during drying of hydroxyapatite droplets. Significant temperature differences were observed between the surface and center of agglomerates. We also found lower rates of external heat and mass transfer between drying air and droplets, higher heat transfer resistance, and heat accumulation in the crust layer of hydroxyapatite droplets. We showed that the larger density, lower heat conductivity, and higher heat capacity of hydroxyapatite were responsible for the differences in drying mechanisms of hydroxyapatite and silica. The obtained results are significant for designing an industrial-scale spray dryer capable of producing nanoparticle agglomerates for environmental applications. Springer-Verlag Berlin Heidelberg, 2015 Spray drying nationallicence Drying mechanism nationallicence Hydroxyapatite nationallicence Mathematical model nationallicence Numerical simulation nationallicence Julklang Wittaya Suranaree University of Technology, 111 University Avenue, Muang District, 30000, Nakhon Ratchasima, Thailand aut Golman Boris Suranaree University of Technology, 111 University Avenue, Muang District, 30000, Nakhon Ratchasima, Thailand aut Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/5(2015-06-01), 1217-1226 1618-954X 17:5<1217 2015 17 10098 https://doi.org/10.1007/s10098-015-0931-z text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10098-015-0931-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Julklang Wittaya Suranaree University of Technology, 111 University Avenue, Muang District, 30000, Nakhon Ratchasima, Thailand aut NATIONALLICENCE 700 1- Golman Boris Suranaree University of Technology, 111 University Avenue, Muang District, 30000, Nakhon Ratchasima, Thailand aut NATIONALLICENCE 773 0- Clean Technologies and Environmental Policy Springer Berlin Heidelberg 17/5(2015-06-01), 1217-1226 1618-954X 17:5<1217 2015 17 10098