نتایج جستجو برای: effective volume fraction

تعداد نتایج: 1100971  

Journal: :international journal of advanced design and manufacturing technology 0
navid bozorgan abadan branch, islamic azad university,abadan, iran maryam shafahi california state polytechnic university, pomona, california, usa

the performance of a γ-al 2 o 3 /n-decane nanofluid shell-and-tube heat exchanger in a biomass heating plant is analyzed to specify the optimum condition based on the maximum heat transfer rate and performance index for wide range of nanoparticle volume fraction (0–7%). compared with pure          n-decane, the obtained results in this research show that by using γ-al 2 o 3 /n-decane nanofluid ...

Journal: :journal of nanostructures 0
mohammad hemmat esfe young researchers and elite club, mashhad branch, islamic azad university, mashhad, iran hadi rostamian young researchers and elite club, mashhad branch, islamic azad university, mashhad, iran masoud afrand department of mechanical engineering, najafabad branch, islamic azad university, najafabad, iran somchai wongwises fluidmechanics, thermal engineering and multiphase flow research lab. (future), department of mechanical engineering, faculty of engineering, kingmongkut’s university of technology thonburi, bangmod, bangkok , thailand

in this study, effects of multi walled carbon nanotubes and temperature on rheological behavior of engine oil (10w40) have been examined. for this purpose, the experiments were carried out in the temperature range of 5-55°c for several suspensions with solid volume fractions of 0.025%, 0.05%, 0.1%, 0.25%, 0.5% and 0.75%. the viscosity of all samples was measured in the shear rate range of 666s-...

Journal: :Magnetic resonance in medicine 2001
J B Mandeville B G Jenkins B E Kosofsky M A Moskowitz B R Rosen J J Marota

Functional MRI of rat brain was performed at 2 Tesla following intravenous injection of cocaine in order to 1) determine if changes in CBV and changes in BOLD signal were regionally coupled in brain parenchyma, and 2) compare the sensitivities of these imaging methods across different brain structures. Percent changes in CBV and BOLD relaxation rate were spatially and temporally coupled during ...

Journal: :Journal of Mathematical Analysis and Applications 2011

Journal: :Journal of the Atomic Energy Society of Japan / Atomic Energy Society of Japan 1966

The combined effects of nanoparticle and magnetic field on the nonlinear Jeffery-Hamel flow are analyzed in the present study. The basic governing equations are solved analytically to nonlinear ordinary differential equation using perturbation method together with a semi-numerical analytical technique called Hermite- Padé approximation. The obtained results are well agreed with that of the Adom...

M. Sahooli M. Shariaty Niassar S. Sabbaghi

In this article CuO/water nanofluid was synthesized by using polyvinylpyrolidone (PVP) as the dispersant.  Thenanofluid stability period and the heat transfer enhancement were determinedby measuring the thermal conductivities. To study the nano-fluid stability, zeta (ζ) potential, and absorbency were measured under different pH values and PVP surfactant concentrations; also thermal conductivity...

1997
J. Quintanilla S. Torquato

Although the volume fraction is a constant for a statistically homogeneous random medium, on a spatially local level it fluctuates. We study the full distribution of volume fraction within an observation window of finite size for models of random media. A formula due to Lu and Torquato for the standard deviation or ‘‘coarseness’’ associated with the local volume fraction j is extended for the n...

MB TAVAKOLI,

Currently available non-invasive clinical methods for diagnosing osteoporosis are mainly associated with ionizing radiation. Ultrasonic assessment of bone disease is a more recent technology. A theoretical explanation for the relationship between ultrasonic parameters and bone structure is necessary. Thus, two types of bone samples of perspex (HAP) and perspex-glass beads were produced. Ea...

GH. R. Mehdizadeh Ahangar S.E. Ghasemi,

In the present work the effect of Cu-Water nanofluid, as heat transfer fluid, on the performance of a parabolic solar collector was studied numerically. The temperature field, thermal efficiency, mean-outlet temperatures have been evaluated and compared for the conventional parabolic collectors and nanofluid based collectors. Further, the effect of various parameters such as fluid velocity, vol...

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