1. Αποθετήριο Παραδοτέων Υποτρόφων Δράσεων ΕΣΠΑ Τριτοβάθμιας Εκπαίδευσης 2017-2023
2. Όλο το Αποθετήριο
3. Ερευνητικές ομάδες

Τύπος:	Άρθρο σε επιστημονικό περιοδικό
Τίτλος:	Numerical study of flow and particle deposition in wall-flow filters with intact or damaged exit
Συγγραφέας:	[EL] Δριτσέλης, Χρήστος[EN] Dritselis, Chris [EL] Τσορμπατζόγλου, Φωτεινή[EN] Tzorbatzoglou, Fotini [EL] Μαστρόκαλος, Μάριος[EN] Mastrokalos, Marios [EL] Χαραλάμπους, Ονούφριος[EN] Haralampous, Onoufrios
Ημερομηνία:	02/12/2019
Περίληψη:	We examine the time-dependent three-dimensional gas-particle flow in an intact wall-flow filter consisting of channels alternatively plugged at each end and a partially damaged filter in which the rear plugs are removed. Our focus is placed on highlighting the differences in the flow pattern and the deposition process between the two geometries. The Navier–Stokes equations are solved for the fluid flow coupled with a Brinkman/Forchheimmer model in order to simulate the flow in the porous walls and plugs. Discrete particle simulation is utilized to determine the nanoparticle trajectories. Using this scheme, we are able to characterize the main features of the flow fields developing in the intact and damaged filters with respect to the Reynolds number and identify those affecting the transport and deposition of particles that have three representative response times. We present fluid velocity iso-contours, which describe the flow regimes inside the channels, as well as in regions upstream and downstream of them. We provide evidence of local recirculating bubbles at the entrance of the channels and after their exit, whereas back-flow occurs in front of the rear plugs of the intact channels. We show that the flow leaves the channels as strong jets that may break up for certain flow parameters, leading to turbulence with features that depend on the presence of the rear plugs. The removal of the rear plugs affects the flow distribution, which, in turn influences the flow rates along the channels and through the walls. We describe the particle trajectories and the topology of deposited particles and show that particles follow closely the streamlines, which may cross the surface of permeable walls for both flow configurations. The distribution of deposited particles resembles the spatial variation of the through-wall flow rate, exhibiting two peak values at both ends of the intact filter channel, and one local maximum near the entrance of the damaged filter channel that is diminished at the exit. We also investigate in detail the particle deposition on the frontal face and indicate that particle accumulation at the edges of the entrance is favored for particles with low response times in flows with high fluid mass rates for both intact and damaged filters. Finally, we examine the filtration efficiency for the defective channels without rear plugs and show that fewer particles are captured as the Reynolds number is increased. A smaller reduction of the filtration efficiency is also predicted with increasing particle size.
Γλώσσα:	Αγγλικά
Τόπος δημοσίευσης:	Larissa, Greece
Σελίδες:	29
DOI:	doi:10.3390/fluids4040201
EISSN:	2311-5521
Θεματική κατηγορία:	[EL] Επιστήμη Μηχανολόγου Μηχανικού[EN] Mechanical Engineering
Λέξεις-κλειδιά:	particulate filter; deposition; numerical simulation; Lagrangian particle tracking; porous media
Κάτοχος πνευματικών δικαιωμάτων:	© 2019 by the authors. Licensee MDPI, Basel, Switzerland.
Όροι και προϋποθέσεις δικαιωμάτων:	This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Διατίθεται ανοιχτά στην τοποθεσία:	https://www.mdpi.com/2311-5521/4/4/201
Ηλεκτρονική διεύθυνση του τεκμηρίου στον εκδότη:	https://www.mdpi.com/2311-5521/4/4/201
Ηλεκτρονική διεύθυνση περιοδικού:	https://www.mdpi.com/journal/fluids
Τίτλος πηγής δημοσίευσης:	Fluids
Τεύχος:	4
Τόμος:	4
Σελίδες τεκμηρίου (στην πηγή):	201(1-29)
Σημειώσεις:	This research is co-financed by Greece and the European Union (European Social Fund-ESF) through the Operational Programme “Human Resources Development, Education and Lifelong Learning 2014–2020” in the context of the project “Microscale Computational and Experimental Investigation of the Behavior of Partially Failed Particulate Filters” (MIS 5007658).
Εμφανίζεται στις συλλογές:	Ερευνητικές ομάδες