Permeability and Form Coefficient Measurement of Porous Inserts With Non-Darcy Model Using Non-Plug Flow Experiments
01 May 2006-Journal of Fluids Engineering-transactions of The Asme (American Society of Mechanical Engineers)-Vol. 128, Iss: 3, pp 638-642
TL;DR: In this paper, the Hazen-Dupuit-Darcy model is used to curve-fit the longitudinal global pressure drop versus average fluid speed data from an isothermal, steady flow, hydraulic experiment across a test section of the porous medium.
Abstract: Permeability (K) and form coefficient (C) are the characteristic hydraulic properties of any porous medium. They are determined simultaneously, for known fluid thermo-physical properties by using the Hazen-Dupuit-Darcy model (HDD) to curve-fit the longitudinal global pressure-drop versus average fluid speed data from an isothermal, steady flow, hydraulic experiment across a test section of the porous medium. The K and C thus measured are global parameters, i.e., valid for the entire porous medium and universal provided the flow throughout the porous medium is of plug flow nature. We report here experimental evidence on the influence of non-plug flow velocity profiles at the inlet, on the simultaneous determination of K and C of fissure- and rod bundle-type porous inserts. Although variation in K is minimal, as much as 12.1% variation in C is observed, when going from a fully developed velocity profile to a plug flow profile at the inlet.
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Cites methods from "Permeability and Form Coefficient M..."
...[29] also looked at permeability and form drag coefficient of porous inserts in an experiment using rod and holes with water as the working fluid they show that their experimental data correlates to Hazen-Dupuit-Darcy model....
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Abstract: The effect of the cooling performance of a copper metal foam heat sink under buoyancy-induced convection is investigated in this work. Experiments are conducted on copper metal foam of 61.3% porosity with 20 pores per inch. The pressure drop experiment is carried out to find the permeability and foam coefficient of the porous media. It is found that the property of porous media changes by changing the angle of inclination of the porous media from a horizontal to a vertical position while keeping the orientation and porosity the same. The Hazen-Dupuit Darcy model is used to curve-fit the longitudinal global pressure drop versus the average fluid speed data from an isothermal steady-flow experiment across the test section of the porous medium. The study concludes that the permeability and foam coefficient for copper foam is found to be 1.11 × 10−7 m2 and 79.9 m−1, respectively. The heat transfer study shows that the thermal performance of copper metal foam is 35–40% higher than the conventional alu...
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Cites background or methods from "Permeability and Form Coefficient M..."
...The accepted practice for evaluating C and K is by using the Hazen-Dupuit Darcy (HDD) model and curve-fitting the longitudinal global pressure drop against the average fluid speed data under isothermal, steady-flow conditions [16]....
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...For higher average velocities, form drag dominates the flow through the porous medium [16]....
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References
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Book•
01 Jan 1992TL;DR: In this paper, an introduction to convection in porous media assumes the reader is familiar with basic fluid mechanics and heat transfer, going on to cover insulation of buildings, energy storage and recovery, geothermal reservoirs, nuclear waste disposal, chemical reactor engineering and the storage of heat-generating materials like grain and coal.
Abstract: This introduction to convection in porous media assumes the reader is familiar with basic fluid mechanics and heat transfer, going on to cover insulation of buildings, energy storage and recovery, geothermal reservoirs, nuclear waste disposal, chemical reactor engineering and the storage of heat-generating materials like grain and coal. Geophysical applications range from the flow of groundwater around hot intrusions to the stability of snow against avalanches. The book is intended to be used as a reference, a tutorial work or a textbook for graduates.
5,570 citations
Book•
01 Jan 1971
TL;DR: In this paper, the authors present basic concepts and analysis of experimental data for basic electrical measurements and sensors, including Displacement and Area Measurements, Pressure Measurement, Flow Measurement and Temperature Measurement.
Abstract: 1 Introduction 2 Basic Concepts 3 Analysis of Experimental Data 4 Basic Electrical Measurements and Sensing Devices 5 Displacement and Area Measurements 6 Pressure Measurement 7 Flow Measurement 8 The Measurement of Temperature 9 Thermal and Transport-Property Measurements 10 Force, Torque, and Strain Measurements 11 Motion and Vibration Measurement 12 Thermal and Nuclear-Radiation Measurements 13 Air-Pollution Sampling and Measurement 14 Data Acquisition and Processing 15 Report Writing and Presentations 16 Design of Experiments Appendix A-Conversion Factors and Material Properties Appendix B-Digital Imaging Systems
2,943 citations
Book•
01 Jan 1934
TL;DR: The Chemical Engineers handbook as mentioned in this paper, Chemical engineers handbook, Chemical engineer handbook, Chemical engineers Handbook, Chemical Engineering handbook and Chemical Engineers Handbook, 2007.2.1.
Abstract: Chemical engineers handbook , Chemical engineers handbook , کتابخانه دیجیتالی دانشگاه علوم پزشکی و خدمات درمانی شهید بهشتی
2,611 citations
TL;DR: In this article, open-cell aluminum foams were investigated using water to determine their hydraulic characteristics, and the results obtained in this study are relevant to engineering applications employing metal foams ranging from convection heat sinks to filters and flow straightening devices.
Abstract: Open-cell aluminum foams were investigated using water to determine their hydraulic characteristics. Maximum fluid flow velocities achieved were 1.042 m/s. The permeability and form coefficient varied from 2.46×10 -10 m 2 and 8701 m -1 to 3529 × 10 -10 m 2 and 120 m -1 , respectively. It was determined that the flowrate range influenced these calculated parameters, especially in the transitional regime where the permeability based Reynolds number varied between unity and 26.5. Beyond the transition regime where Re K ≥30, the permeability and form coefficient monotonically approached values which were reported as being calculated at the maximum flow velocities attained. The results obtained in this study are relevant to engineering applications employing metal foams ranging from convection heat sinks to filters and flow straightening devices
299 citations
TL;DR: In this article, a heat exchanger, using mechanically compressed microporous matrices, is developed for cooling high power electronics, and the thermal efficiency of this new device depends on the hydraulic characteristics (porosity, permeability K, and Forchheimer coefficient c F ) of the matrix inserted in it.
Abstract: A heat exchanger, using mechanically compressed microporous matrices, is being developed for cooling high power electronics. The thermal efficiency of this new device depends on the hydraulic characteristics (porosity Φ, permeability K, and Forchheimer coefficient c F ) of the matrix inserted in it. These quantities have to be obtained experimentally as predictive models do not exist. Twenty-eight compressed matrices are initially chosen for experimental testing. Based on structural requirements, nine matrices are selected for full hydraulic characterization. The determination of permeability and inertia coefficient of each matrix is performed following a proposed direct methodology based on the curve fitting of the experimental results. This methodology is found to yield more consistent and accurate results than existing methods. The uncertainty of the experimental results is evaluated with a new and general procedure that can be applied to any curve fitting technique. Results indicate that the tested matrices have a unique characteristic, that of a relatively wide porosity range, from 0.3 to 0.7, within a relatively narrow permeability range, from 1.0 x 10 -10 m 2 to 12 X 10 -10 m 2 . The inertia coefficient varies from 0.3 to 0.9. These hydraulic characteristics lead to a microporous heat exchanger performing within requirements.
146 citations