Vol.6, No 1, 2008 pp. 13 - 24
UDC 54-138 : 519.872
NUMERICAL SIMULATION OF PARTICLES DISPERSION AND DEPOSITION IN CHANNEL FLOW OVER TWO SQUARE CYLINDERS IN TANDEM
Abouzar Moshfegh1, Mousa Farhadi2
1Faculty of Mechanical Engineering, Noshirvani University of Technology, Babol, Islamic Republic of Iran
2Faculty of Mechanical Engineering, Noshirvani University of Technology, P.O.Box 484 Babol, Islamic Republic of Iran
E-mail: mfarhadi@nit.ac.ir
Abstract. Numerical simulation of dispersion and deposition of aerosol particles in a channel flow over two square cylinders in tandem are studied. A Lagrangian particle tracking computational procedure was developed and was used for simulating particles transport and deposition. Drag, gravity and buoyancy effects are included in the computational model. Ensembles of particles in asterisk arrangement are released from different source points to calculate their capture efficiency on walls and obstructions. The changes in location of source points, gravity direction, size and density of particles and the gap between obstructions to reduce capture efficiency are discussed. Parallel time evolution of four different clusters of particles representing the worst possible situation, issuing from maximum obstruction capture efficiency, are illustrated.
Key Words: Obstructed Channel Flow, Lagrangian Tracking Procedure, Particle Dispersion and Deposition, Capture Efficiency.
NUMERIČKA SIMULACIJA RASIPANJA I TALOŽENJA ČESTICA U KANALSKOM TOKU IZNAD DVA KVADRATNA CILINDRA U PARU
Numerička rešenja rasipanja i taloženja aerosolnih čestica u jednom kanalnom toku iznad dva kvadratna cilindra u paru se proučavaju. Računska procedura praćenja lagranžovih čestica je razvijena i korišćena za simulaciju transporta i deponovanje čestica. Uticaji vučenja, gravitacije i potiska su uključeni u model računanja. Spojevi čestica u zvezdastom rasporedu se oslobađaju sa različitih izvornih tačaka kako bi se izračunala efikasnost njihovog hvatanja na zidove i prepreke. Takođe se razmatraju promene u lokaciji izvornih tačaka, pravca gravitacije, veličine i gustine čestica kao i jaz između prepreka radi umanjenja efikasnosti hvatanja čestica. Paralelno vreme razvoja četiri grupacije čestica koje predstavlja najgoru moguću situaciju uz maksimalnu opstrukciju efikasnosti hvatanja čestica takođe se ilustruje.
Ključne reči: preprečen kanalski tok, langražovski postupak praćenja, rasipanje i taloženje čestica, efikasnost hvatanja čestica