Characteristics of inertial deposition in a double bifurcation

被引:32
作者
Lee, JW
Goo, JH
Chung, MK
机构
[1] Department of Mechanical Engineering, Pohang Univ. of Sci. and Technology, Pohang, Kyungbuk, 790-600
关键词
D O I
10.1016/0021-8502(95)00538-2
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
A direct numerical simulation of air flow and particle motion is conducted for doubly bifurcated models in order to see the effect of the velocity profile distorted by the previous bifurcation on particle deposition, because particle deposition in a bifurcated airway is very sensitive to the velocity profile at the inlet, not the magnitude. Flow fields are solved using the FIDAP, an FEM code, and particle trajectories are obtained by a Lagrangean integration. Characteristics of air how and particle motion in double bifurcations are quite different from what can be imagined based on results for single bifurcation models. The distorted velocity profile can reduce deposition efficiency in the second generation by about 50% when compared with the single bifurcation for the same Stokes number. The bifurcation geometry is also important for particle deposition, and the out-of-plane rotated geometry gives about 40% higher deposition than the in-plane bifurcations.
引用
收藏
页码:119 / 138
页数:20
相关论文
共 20 条
[1]   AEROSOL-PARTICLE IMPACTION IN THE CONDUCTING AIRWAYS [J].
AGNEW, JE ;
PAVIA, D ;
CLARKE, SW .
PHYSICS IN MEDICINE AND BIOLOGY, 1984, 29 (07) :767-777
[2]   INERTIAL AND INTERCEPTIONAL DEPOSITION OF SPHERICAL-PARTICLES AND FIBERS IN A BIFURCATING AIRWAY [J].
CAI, FS ;
YU, CP .
JOURNAL OF AEROSOL SCIENCE, 1988, 19 (06) :679-688
[3]   MOTION OF PARTICLES IN BENDS OF CIRCULAR PIPES [J].
CHENG, YS ;
WANG, CS .
ATMOSPHERIC ENVIRONMENT, 1981, 15 (03) :301-306
[4]  
Crane R. I., 1977, Journal of Aerosol Science, V8, P161, DOI 10.1016/0021-8502(77)90003-9
[5]  
ENGELMAN M, 1991, FIDAP THEORETICAL MA
[6]  
FRIEDLANDER SK, 1977, SMOKE DUST HAZE, P106
[7]   INERTIAL DEPOSITION OF PARTICLES IN THE HUMAN BRANCHING AIRWAYS [J].
GAWRONSKI, R ;
SZEWCZYK, KW .
JOURNAL OF AEROSOL SCIENCE, 1986, 17 (05) :795-801
[8]  
Hinds W.C., 1982, Aerosol Technology
[9]   A MODEL STUDY OF FLOW DYNAMICS IN HUMAN CENTRAL AIRWAYS .2. SECONDARY FLOW VELOCITIES [J].
ISABEY, D ;
CHANG, HK .
RESPIRATION PHYSIOLOGY, 1982, 49 (01) :97-113
[10]   PARTICLE DEPOSITION IN BIFURCATING AIRWAY MODELS WITH VARYING AIRWAY GEOMETRY [J].
KIM, CS ;
FISHER, DM ;
LUTZ, DJ ;
GERRITY, TR .
JOURNAL OF AEROSOL SCIENCE, 1994, 25 (03) :567-581