نتایج جستجو برای: darcy flow coefficient

تعداد نتایج: 639571  

Journal: :تحقیقات مهندسی کشاورزی 0
حجت احمدی دانشجوی دکتری حسن رحیمی استاد دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران عبدالحسین هورفر استادیار گروه آموزشی مهندسی آبیاری و آبادانی دانشکده مهندسی و فناوری کشاورزی دانشگاه تهران عباس سروش دانشیار دانشکده مهندسی عمران و محیط زیست دانشگاه صنعتی امیرکبیر پیتر فرمییر استاد انستیتو ژئوتکنیک دانشگاه اشتوتگارت

the consolidation test method proposed by terzaghi and used in most soil mechanic laboratories has limitations and weaknesses. to get correct results, improvement and modification of the test method is essential. several experimental methods, such as constant loading rate, gradient and constant rate of strain (crs) have been used over the past 40 years. of these methods, crs is more advantageou...

Journal: :journal of agricultural science and technology 2010
j. m. v. samani m. heydari

rock has been advantageously employed in hydraulic structures such as rockfill dams, gabion weirs and drain works. one rockfill dam applications can be flood control in wa-tershed management. the objectives of building rockfill detention dams are flow storage for a specific period and lowering of the outflow hydrograph. as this type of dam consists of coarse particles, seepage flow will deviate...

Faezeh Mosallat Masoud Ziabasharhagh, Mohammad Reza Shahnazari

The value of the permeability in fluid flow through porous media is important for process investigation. In low Reynolds number, the classic Darcy’s law is suitable for simulation of fluid flow. In this paper, an experimental study for evaluation of preformed fiber permeability has been done. Also, the deviations from the classical Darcy law by experimental and numerical simulation of the N...

2015
Wei Zhong Xin Li Guoliang Tao Toshiharu Kagawa Eva Pellicer

Sintered metal porous media currently plays an important role in air bearing systems. When flowing through porous media, the flow properties are generally represented by incompressible Darcy-Forchheimer regime or Ergun regime. In this study, a modified Ergun equation, which includes air compressibility effects, is developed to describe friction characteristic. Experimental and theoretical inves...

2011
A. A. Alazba M. B. ElNesr Abdulrahman Ali Alazba

Hazen-Williams equation is used widely by irrigation systems’ designers due to its simplicity.However, Darcy-Weisbach equation is more accurate and reliable. The accuracy of the latter is due to its friction coefficient, which depends on both flow characteristics and pipe surface state. On the other hand, Hazen-Williams’ coefficient (C) depends only on pipe substance and age. A comparative anal...

Journal: :Applied Mathematics and Computation 2004
Mohamed Fathy El-Amin

The problem of hydrodynamic dispersion in non-Darcy free convection heat and mass transfer from vertical surface embedded in a porous medium has been presented. The Forchheimer extension is considered in the flow equations. The flow, temperature and concentration fields in Darcy and non-Darcy porous media are observed to be governed by complex interactions among the diffusion rate Le, buoyancy ...

2013
Christian Waluga

We propose and analyze a hybrid discontinuous Galerkin method for the solution 10 of incompressible flow problems, which allows to deal with pure Stokes, pure Darcy, and 11 coupled Darcy-Stokes flow in a unified manner. The flexibility of the method is demonstrated 12 in numerical examples.

2016
Manjit Singh Chanpreet Singh D. Gangacharyulu J. L. Nieber R. Z. Dautov A. G. Egorov

The Flow through saturated-unsaturated porous media is extremely important in various natural and industrial based applications. While the Darcy's law with various modifications are used to model the flow through a porous media, the flow through unsaturated porous media is largely based on conservation of mass and modified Darcy's law where non-linear relationship exists between the p...

In this paper, we analyze the thermal radiation and chemical reaction impacts on MHD peristaltic motion of the Eyring-Powell fluid through a porous medium in a channel with compliant walls under slip conditions for velocity, temperature, and concentration. Assumptions of a long wave length and low Reynolds number are considered. The modeled equations are computed by using the perturbation metho...

2013
Herbert Egger Christian Waluga

We propose and analyze a hybrid discontinuous Galerkin method for the solution of incompressible flow problems, which allows to deal with pure Stokes, pure Darcy, and coupled Darcy-Stokes flow in a unified manner. The flexibility of the method is demonstrated in numerical examples.

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