TY - JOUR
T1 - Turbulent Fluctuation behind Pleated Air Filters
T2 - (A Numerical Study on Air Flow Turbulence behind Pleated Air Filters)
AU - Suwa, Yoshihide
AU - Fujii, Shuji
AU - Xie, Gouping
PY - 1992
Y1 - 1992
N2 - Investigations for air flow turbulences are quite important to clarify small-particle contamination mechanisms in clean chambers. Strongly fluctuated air flow turbulence is recognized behind pleated air filters. Turbulent flow characteristics behind pleated high-efficiency particulated air filters are numerically analyzed and studied by direct simulation using a 3rd-order Kawamura-Kuwahara scheme. As the result of the study, the following typical phenomena were found: (1) Free shear caused by flow velocity nonuniformity makes vortex streets behind the filter ends. These vortex streets interfare with neighboring streets and spanwise synchronized fluctuation is generated. (2) Streamwise distribution of ′2> has a sharp peak with some distance from the filter ends. This peak appears at the position the vortex interference starts. Rate of the mean velocity change becomes maximum in this position. (3)Results calculated by direct simulation are qualitatively in good agreement with the experimental results.
AB - Investigations for air flow turbulences are quite important to clarify small-particle contamination mechanisms in clean chambers. Strongly fluctuated air flow turbulence is recognized behind pleated air filters. Turbulent flow characteristics behind pleated high-efficiency particulated air filters are numerically analyzed and studied by direct simulation using a 3rd-order Kawamura-Kuwahara scheme. As the result of the study, the following typical phenomena were found: (1) Free shear caused by flow velocity nonuniformity makes vortex streets behind the filter ends. These vortex streets interfare with neighboring streets and spanwise synchronized fluctuation is generated. (2) Streamwise distribution of ′2> has a sharp peak with some distance from the filter ends. This peak appears at the position the vortex interference starts. Rate of the mean velocity change becomes maximum in this position. (3)Results calculated by direct simulation are qualitatively in good agreement with the experimental results.
KW - Direct simulation
KW - Finite Difference Method
KW - Interference of Vortex streets
KW - Numerical Analysis
KW - Pleated Air Filter
KW - Turbulent Flow
KW - Wake
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U2 - 10.1299/kikaib.58.1587
DO - 10.1299/kikaib.58.1587
M3 - Article
AN - SCOPUS:85007684709
SN - 0387-5016
VL - 58
SP - 1587
EP - 1592
JO - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
JF - Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
IS - 549
ER -