scholarly journals Simulation Study on the Flow Field of Muffler Array in Air-cooling Platform Based on Porous Media Model

2014 ◽  
Author(s):  
Peng Xie ◽  
Bin Zhang ◽  
XiaoKuan Lee ◽  
ZhongXu Kang
Keyword(s):  
Porous Media ◽  
Flow Field ◽  
Simulation Study ◽  
Air Cooling ◽  
Porous Media Model

Numerical Simulation of Airborne Salt Particle Behavior in Dry Gauze Method Using Porous Media Model

2021 ◽  
pp. 1-37
Author(s):  
Yuta Tsubokura ◽  
Kyohei Noguchi ◽  
Tomomi Yagi
Keyword(s):  
Porous Media ◽  
Flow Field ◽  
Collection Efficiency ◽  
Steel Structures ◽  
Salt Particle ◽  
Wooden Frame ◽  
Collection Device ◽  
Porous Media Model ◽  
Corrosion Of Steel ◽  
Porous Media Method

Abstract Airborne salt accelerates the corrosion of steel materials and, thus, must be quantitatively evaluated for the management of steel structures. In Japan, the dry gauze method, which uses a gauze embedded in a wooden frame, is often used to evaluate the amount of airborne salt. However, its collection efficiency for salt particles has not been verified owing to the complex airflows around the device. Therefore, as a first step to clarify the collection efficiency, the authors simulated the flow field around the collection device using computational fluid dynamics. In this study, the gauze was modeled as a porous medium to reduce the computational costs. Wind tunnel tests were performed to obtain the pressure loss coefficients of the gauze, which is necessary for the porous media method. Subsequently, particle tracking was performed in the calculated flow field, and the collection efficiency was evaluated under the condition of a filtration efficiency of 100%. The flow fields around the device were accurately reproduced using the porous media model, which considered both the tangential and normal resistances of the gauze. This result suggests that the tangential resistance must be considered in the porous media model when the porosity of an object is small, even if the thickness is small. The dependence of collection efficiency on wind speed and direction was quantitatively evaluated. The results showed that the collection efficiency was greatly affected by the complicated flow field around the device due to the combination of the gauze and wooden frame.

Supercritical Fluid Spray Dyeing: A New Method of Dyeing and Simulations of its Flow Field

2011 ◽  
Vol 396-398 ◽  
pp. 2038-2043 ◽  
Author(s):  
Ming Lu Wang ◽  
Wei Qiang Wang ◽  
Yan Peng Qu ◽  
Yan Liu ◽  
Zhi Yong Xu
Keyword(s):  
Porous Media ◽  
Fluid Flow ◽  
Flow Field ◽  
Supercritical Fluid ◽  
Actual Process ◽  
Dyeing Process ◽  
Porous Media Model ◽  
Simulating Analysis ◽  
Temperature And Pressure ◽  
Two Stages

The supercritical fluid flow jetted out from a nozzle was divided into two stages, free jetting and passing through the porous media, in a supercritical spray dyeing process. According to the nature of the flow, the free jetting model and passing through porous media model were established separately. Based on the established models, the characteristics of supercritical fluid flow field in the supercritical fluid spray dyeing process were investigated firstly in this paper. Distributions of the temperature and pressure and their influencing factors in the flow field, which are the determinants of the spray dyeing process, were obtained and analyzed. Besides, the mass flow and covering diameter sprayed by supercritical fluid were studied. The simulating analysis may provide a theoretical basis and guidance for the actual process of supercritical fluid spray dyeing.

Discussion on appropriate material parameters for a porous media model of the IVD

PAMM ◽  
2007 ◽  
Vol 7 (1) ◽  
pp. 4020003-4020004
Author(s):  
Nils Karajan ◽  
Wolfgang Ehlers
Keyword(s):  
Porous Media ◽  
Material Parameters ◽  
Porous Media Model

scholarly journals Waves and currents propagation through porous media: model experiments and scale effects

2015 ◽  
Author(s):  
Gwendoline ARNAUD ◽  
Vincent REY ◽  
Damien SOUS ◽  
Julien TOUBOUL ◽  
Fabrice GOUAUD
Keyword(s):  
Porous Media ◽  
Scale Effects ◽  
Model Experiments ◽  
Porous Media Model ◽  
Waves And Currents
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