Реферат: An adequate description of the velocity field is of utmost importance in the rational design of wall-cooled packed bioreactors applied to solid-state fermentation. This contribution assessed the hydrodynamics under abiotic conditions in a novel bench-scale wall-cooled tray bioreactor packed with moistened particles of agroindustrial waste. The work, in particular, aimed at determining hydrodynamic descriptors under operating conditions of industrial interest: wall temperatures of 25–45 °C, controlled moisture content of 6–60% and specific volumetric flow rates of 1.25–62.50 Lair.kgs–1.min−1. A two-zone momentum model was developed, allowing the description of velocity profiles and the characterisation of viscous and inertial resistances due to the interaction between the solid and fluid in the core and wall regions of the packed tray. The core region used Blake-Kozeny and Burke-Plummer approaches, and the wall region used a pseudo-boundary layer approach to describe velocity profiles. The two-zone model was submitted to regression analyses, and hydrodynamic parameters were estimated, exhibiting statistical significance and phenomenological consistency. The two-zone model reduced computing time in describing the same velocity profiles by 3000–3600% compared to the conventional hydrodynamic model (Navier-Stokes-Darcy-Forchheimer equations); the results are thoroughly analysed and discussed. As observations of pressure drop were about two orders of magnitude higher than those predicted by classical correlations developed for chemical packed beds, a pseudo-heuristic correlation was developed; this permitted the determination of permeabilities affecting viscous and inertial frictional losses in the core region. The Darcy number (10−8 < Da < 10−4 and) indicated a non-Darcyan behaviour. The Forchheimer number (10−7 < Fo < 10−3) elucidated an important effect of inertial resistances in the packed tray. Viscous and inertial frictional losses in the wall region were characterised by determining the thickness of the pseudo-boundary layer (10−3 cm) and the effective viscosity (10−3 Pa.s). All descriptors elucidate the importance of hydrodynamics in the different regions of the packed bioreactor. This investigation gives insights into the hydrodynamics in the studied packed tray bioreactor, which are essential for future studies targeted at understanding its interaction with heat and mass transport mechanisms under abiotic and biotic conditions.

Библиографическая ссылка: Gómez-Ramos G.A. , Castillo-Araiza COCA C.O. , Huerta-Ochoa S. , Couder-García M. , Prado-Barragán A.
Assessment of hydrodynamics in a novel bench-scale wall-cooled packed bioreactor under abiotic conditions
Chemical Engineering Journal. 2019. V.375. 121945 :1-15. DOI: 10.1016/j.cej.2019.121945 WOS Scopus OpenAlex

Даты:

Опубликована online:

11 июн. 2019 г.

Идентификаторы БД:

Web of science:	WOS:000483341000087
Scopus:	2-s2.0-85067398663
OpenAlex:	W2951354158

Цитирование в БД:

БД	Цитирований
OpenAlex	16
Scopus	13

Альметрики: