Determination of Permeability and Inertial Coefficients of Sintered Metal Porous Media Using an Isothermal Chamber

Zhong, Weimin; Ji, Xiang; Li, Chong; Fang, Jiwen; Fang-hua, Liu

doi:10.3390/app8091670

Cited by 25 publications

(13 citation statements)

References 36 publications

(61 reference statements)

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“…Equation ( 13),the Darcy-Forchheimer equation, is used for fluid flow through porous media at moderate Reynold's numbers (i.e. > 10) [48]. Previous work [48,49]…”

Section: Stenosis Modelsmentioning

confidence: 99%

A multiscale model of vascular function in chronic thromboembolic pulmonary hypertension

Colebank,

Qureshi,

Rajagopal

et al. 2021

Preprint

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Pulmonary hypertension (PH) is a debilitating disease that includes five main subgroups, but only one is curable: chronic thromboembolic pulmonary hypertension (CTEPH). CTEPH is caused by recurrent or unresolved pulmonary thromboemboli, leading to perfusion defects and increased arterial wave reflection. Treatment for CTEPH depends on lesion location and severity, and patients with distal lesions are inoperable by standard surgical intervention. Instead, these patients are treated with balloon pulmonary angioplasty (BPA), a multi-session, minimally invasive surgery that disrupts the thromboembolic material blocking the vessel lumen using a catheter balloon. The goal of BPA is to reduce pulmonary arterial pressure and reestablish adequate blood flow to all regions of the lung. However, there still lacks an integrative, holistic tool for identifying target lesions for an optimal treatment. To address this insufficiency, we provide a proof of concept study simulating CTEPH hemodynamics and BPA therapy using a multiscale, one-dimensional (1D) fluid dynamics model. The large pulmonary arterial geometry is derived from a computed tomography (CT) image, whereas a fractal, structured tree represents the small vessels. We model ring-and web-like lesions, common in CTEPH, using two pressure-loss terms. We simulate normotensive conditions and four CTEPH disease scenarios; the latter includes 20 large artery lesions and introduces both local and global vascular remodeling. BPA therapy is simulated by simultaneously reducing lesion severity in three locations. Our predictions mimic severe CTEPH, manifested by an increase in mean proximal pulmonary arterial pressure above 20 mmHg and prominent wave reflections. Both flow and pressure decrease in vessels distal to the lesions and increase in unobstructed vascular regions. We use the main pulmonary artery (MPA) pressure, a wave reflection index, and a measure of flow heterogeneity to select optimal target lesions for BPA. In summary, this study provides a preliminary multiscale, image-to-hemodynamics pipeline for BPA therapy planning for inoperable CTEPH patients.

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“…Equation ( 13),the Darcy-Forchheimer equation, is used for fluid flow through porous media at moderate Reynold's numbers (i.e. > 10) [48]. Previous work [48,49]…”

Section: Stenosis Modelsmentioning

confidence: 99%

A multiscale model of vascular function in chronic thromboembolic pulmonary hypertension

Colebank,

Qureshi,

Rajagopal

et al. 2021

Preprint

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“…where U f is the velocity of the flow on the sidelines of granular particles, k is the permeability of the medium, µ is the fluid viscosity, L is the length of the porous medium, and P is the fluid pressure [23]. When the pressure is increased, the turbulent flow enters the bed quickly.…”

Section: Impinging In Medium Granularmentioning

confidence: 99%

An experimental study of fluidization post impinging fluid in granular bed for breaking sedimentation

Yudiyanto¹,

Wardana

Hamidi

et al. 2020

EEJET

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The impinging fluid can be used as a prevention of sedimentation in the flow of the pipe and the mixing process. Sedimentation is a problem that often occurs in fluid transportation and fluidization. Granular material behavior due to impinging is a phenomenon that is rarely studied. This condition is difficult to observe due to the position of complex fluid movements in the bed. The study tries to find the behavior of fluidization at various granular sizes. The effect of impinging into the granular bed has been observed with experimental studies. Hele-Shaw cell is used as equipment for the observation process. The glass sand is used as a medium of fluidization. The high-speed fluid is injected into a granular bed in a short time. Granular material moves because of the pressure impinging as fluidization. The motion of the granular material is observed by a camera to determine the behavior of the granular material. The primary outcome of the present study is the identification of two very distinct regimes. There are two types of post-impinging fluidization. The first type is the fluid cavity and fluidization. The condition starts with a fluid cavity expansion and continues with the fluidization process. The fluid cavity occurs because the fluid shock pressure pushes the granular material upward. Granular bonds hold the particles' connection and form a cavity. Fluidization after cavity expansion is a settling motion that is influenced by gravity, buoyancy, drag, and granular bonds. The other type is a local fluidized state. The limit for the occurrence of fluid cavity and fluidization is observed with the Reynolds number of impinging. The Reynolds number of impinging is calculated by the velocity of entry of the shock fluid in the granular and multiplied size of the particles divided by the viscosity. The fluid cavity post-impinging occurs at the Reynolds number of the impinging process less than 4,000 (laminar and transition flow area). The local fluidized state has Re of impinging more than 4,000, and the fluidization follows the flow and disappears immediately. This condition causes the bonding of the granules cannot maintain the agglomeration of the granules

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“…Surface scratching and damage easily occur during transportation of glass substrates for liquid-crystal display (LCD). Contactless transport using pneumatic technology can eliminate these problems since air flow is magnetic free and clean [1][2][3][4] . For example, air tracks with arrays of bearing elements equipped on the surface are in use to supply pressurized air beneath flat objects.…”

Section: Introductionmentioning

confidence: 99%

Integration of measurement and simulation of film pressure for estimating deformation of a glass sheet on a noncontact air conveyor

Yang¹,

Zhong²,

Wang³

et al. 2020

Mech. Eng. Sci.

Self Cite

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Recently, large and thin glass substrates are transported by air film conveyors to reduce surface damage. On the production line, the glass substrates are desired to be transported flatly on the conveyor to ensure the quality inspection. A method by feedbacking film pressure to the theoretical model is proposed for estimation of the deformation of the glass sheet, and the validity of the method is theoretically and experimentally verified. First, a theoretical model including the flow behavior through a porous-walled gap is established, and the film pressure distribution can be predicted by solving the model. Then, an experimental setup that can simultaneously measure the film pressure and the flatness of the glass sheet is established, and, the validity of the model is verified experimentally. Next, with the pressure points at the grooves as the boundary and the pressure points at the flange area as the feedback, an algorithm is applied to shape the one-dimensional deformation at the centerlines in accordance with a quadratic curve. Furthermore, two-dimensional deformation of the glass sheet can then be estimated by an interpolation operation. Comparisons of the calculated results with the experimental data verify the effectiveness of the estimating method.

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Determination of Permeability and Inertial Coefficients of Sintered Metal Porous Media Using an Isothermal Chamber

Cited by 25 publications

References 36 publications

A multiscale model of vascular function in chronic thromboembolic pulmonary hypertension

A multiscale model of vascular function in chronic thromboembolic pulmonary hypertension

An experimental study of fluidization post impinging fluid in granular bed for breaking sedimentation

Integration of measurement and simulation of film pressure for estimating deformation of a glass sheet on a noncontact air conveyor

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