A Study on Flow in Duct Constructed of Nonwoven Fabric

2003 ◽  
Author(s):  
Masahiko Sakamoto ◽  
Toshiyuki Sawabe ◽  
Kiichiro Izumi
Keyword(s):  
Pipe Flow ◽  
Flow Direction ◽  
Flow Characteristics ◽  
Nonwoven Fabric ◽  
Circular Pipe ◽  
Small Range ◽  
Air Filter ◽  
One Dimensional ◽  
Circular Pipe Flow ◽  
The One

The purpose of this paper is to investigate both the flow characteristics in the sock type of the air filter constructed of nonwoven fabric and the effect on drag reduction in a circular pipe flow by means of the wall coated with nonwoven fabric. The nonwoven fabric used in these experiments is an electret one made of polypropylene, and the fiber distribution is a random laying. The fiber is about 4 μ m in diameter and 0.6 mm in thickness of web. The nonwoven fabric without adhesion of dust was used in these experiments. The pressure distribution along the flow direction was measured for various parameters such as Reynolds number, shape of the air filter, and type of nonwoven fabric. The value of the permeability for the present nonwoven fabric is on the order of 10−11(m2) within the limits of this experiment. The pressure in the sock type of the air filter increases with increasing Re. The experimental results can be explained by Darcy’s law as d/L is larger than 0.1. In the small range of Re the calculated values obtained by the one-dimensional flow model qualitatively agree with those obtained by this experiment. It was proven that the wall coated with the nonwoven fabric is effective to reduce the drag in the circular pipe flow.

scholarly journals Flow characteristics and circular pipe flow of pulp-suspension.

1990 ◽  
Vol 23 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Kohei Ogawa ◽  
Shiro Yoshikawa ◽  
Akira Suguro ◽  
Jun Ikeda ◽  
Hirohisa Ogawa
Keyword(s):  
Pipe Flow ◽  
Flow Characteristics ◽  
Circular Pipe ◽  
Circular Pipe Flow

0208 Study on circular pipe flow characteristics of ferrofluid

2012 ◽  
Vol 2012 (0) ◽  
pp. 113-114
Author(s):  
Hitoshi SASAKI ◽  
Yuhiro IWAMOTO ◽  
Xiao-Dong NYU ◽  
Hiroshi YAMAGUCHI
Keyword(s):  
Pipe Flow ◽  
Flow Characteristics ◽  
Circular Pipe ◽  
Circular Pipe Flow

Modeling of Wall Friction for Multispecies Solid-Gas Flows

1986 ◽  
Vol 108 (4) ◽  
pp. 486-488 ◽  
Author(s):  
E. D. Doss ◽  
M. G. Srinivasan
Keyword(s):  
Shear Stress ◽  
Flow Model ◽  
Flow Characteristics ◽  
Wall Friction ◽  
Gas Flows ◽  
Two Phase ◽  
One Dimensional ◽  
Friction Models ◽  
Wall Interaction ◽  
The One

The empirical expressions for the equivalent friction factor to simulate the effect of particle-wall interaction with a single solid species have been extended to model the wall shear stress for multispecies solid-gas flows. Expressions representing the equivalent shear stress for solid-gas flows obtained from these wall friction models are included in the one-dimensional two-phase flow model and it can be used to study the effect of particle-wall interaction on the flow characteristics.

scholarly journals Laminar–Turbulent Intermittency in Annular Couette–Poiseuille Flow: Whether a Puff Splits or Not

Entropy ◽  
2020 ◽  
Vol 22 (12) ◽  
pp. 1353
Author(s):  
Hirotaka Morimatsu ◽  
Takahiro Tsukahara
Keyword(s):  
Poiseuille Flow ◽  
Pipe Flow ◽  
Large Scale ◽  
Outer Cylinder ◽  
Base Flow ◽  
Circular Pipe ◽  
Turbulence Structure ◽  
Transitional Regime ◽  
Circular Pipe Flow ◽  
Observation Period

Direct numerical simulations were carried out with an emphasis on the intermittency and localized turbulence structure occurring within the subcritical transitional regime of a concentric annular Couette–Poiseuille flow. In the annular system, the ratio of the inner to outer cylinder radius is an important geometrical parameter affecting the large-scale nature of the intermittency. We chose a low radius ratio of 0.1 and imposed a constant pressure gradient providing practically zero shear on the inner cylinder such that the base flow was approximated to that of a circular pipe flow. Localized turbulent puffs, that is, axial uni-directional intermittencies similar to those observed in the transitional circular pipe flow, were observed in the annular Couette–Poiseuille flow. Puff splitting events were clearly observed rather far from the global critical Reynolds number, near which given puffs survived without a splitting event throughout the observation period, which was as long as 104 outer time units. The characterization as a directed-percolation universal class was also discussed.

scholarly journals Effect of Microbubbles on the Creation of Localized Turbulence in a Circular Pipe Flow

2017 ◽  
Vol 31 (1) ◽  
pp. 20-28 ◽  
Author(s):  
Kotaro NAKAMURA ◽  
Yuji TASAKA ◽  
Yuichi MURAI
Keyword(s):  
Pipe Flow ◽  
Circular Pipe ◽  
Circular Pipe Flow ◽  
The Creation

G0501 Mass Transfer Rate Prediction at Elbow in Circular Pipe Flow.

2013 ◽  
Vol 2013 (0) ◽  
pp. _G0501-01_-_G0501-02_
Author(s):  
Tatsuya TSUNEYOSHI ◽  
Yuki KATAI ◽  
Taro IKAI ◽  
Teppei TANAKA ◽  
Takahiro ITO ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Pipe Flow ◽  
Transfer Rate ◽  
Mass Transfer Rate ◽  
Circular Pipe ◽  
Rate Prediction ◽  
Circular Pipe Flow

1906 Reduction of the Pressure Loss by the Addition of the Organic Nano Tube in the Circular Pipe Flow

2012 ◽  
Vol 2012.18 (0) ◽  
pp. 73-74
Author(s):  
Yuki INAIDA ◽  
Atsushi TAKEYAMA ◽  
Donghyuk KANG ◽  
Kazuhiko YOKOTA
Keyword(s):  
Pipe Flow ◽  
Pressure Loss ◽  
Circular Pipe ◽  
Circular Pipe Flow
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