Two-dimensional CFD modeling of the heat and mass transfer process during sewage sludge drying in a solar dryer

Abstract

The paper presents key assumptions of the mathematical model which describes heat and mass transfer phenomena in a solar sewage drying process, as well as techniques used for solving this model with the Fluent computational fluid dynamics (CFD) software. Special attention was paid to implementation of boundary conditions on the sludge surface, which is a physical boundary between the gaseous phase -air, and solid phasedried matter. Those conditions allow to model heat and mass transfer between the media during first and second drying stages. Selection of the computational geometry is also discussed -it is a fragment of the entire drying facility. Selected modelling results are presented in the final part of the paper.

Numerical simulation of thermal-hydraulic processes in the riser chamber of installation for clinker production

“…Additional aim of the future works ought to be investigation of the heat and mass transfer during thermal decomposition of a single solid particle of raw lime material [20]. In order to implement appropriate conditions it is required to incorporate appropriate procedures in the form of so-called user-defined functions (UDF) in Fluent [17,21].…”

Computational simulation of soybean particles flow in a hopper using computational fluid dynamics (CFD) and discrete elements method (DEM)

“…Research, Society and Development, v. 9, n. 8, e448985463, 2020 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v9i8.5463 8 CFD simulations have gained prominence in studies of heat, mass, and momentum transfers phenomena in various devices, such as spouted beds (Vieira Neto et al, 2008;Cunha et al, 2009;Bortolotti et al, 2013;Santos et al, 2015;Santos et al, 2017;Batista Junior et al, 2019); fluidized beds (Müller et al, 2009;Araújo & Santos, 2017); fixed beds (Béttega et al, 2013, Rocha et al, 2020Stoppe et al 2020); rotational disk granulators (Vieira Neto et al, 2017); dryer drums (Silvério et al, 2014;Cunha et al, 2016;Gravena et al, 2019); solar dryers (Krawczyk & Badyda, 2011;Tegenaw et al, 2019;Rocha et al, 2020;Stoppe et al 2020); concentric and eccentric annuli (Neto et al, 2011;Vieira Neto et al, 2014); horizontal injector wells (Mantegazini & Romero, 2019) and waste treatment tank (Pereira & Góis, 2020).…”

Applications of software in solar drying systems: A review

“…The unsteady condition was considered for thermal and flow processes inside the solar dryer because of the thermodynamic characteristics of the sludge and drying conditions (solar radiation, temperature and humidity of ventilated air, change over time) [11].…”