... frame system. The performance and flow structure of six liquids with different densities and viscosities were characterized, and the hydraulic, volumetric, and mechanical losses were discomposed. The correction factors of flow rate, head, shaft-power, efficiency, and disk friction power in turbine mode...

...Abhay Patil; Wenjie Yin; Rahul Agarwal; Adolfo Delgado; Gerald Morrison The affinity law modified for viscosity effects is further extended to include the power input and efficiency. The power input and efficiency data generated using computational fluid dynamics (CFD) are utilized to represent...

... was evaluated numerically by using a CFD code. The “sudden-rising head effect” is confirmed to exist at a higher viscosity and a certain large surface roughness. The viscosity and roughness, which make a transition of boundary layer flow pattern in both the impeller and volute to the hydraulically smooth regime...

.... nanofluid Rivlin–Ericksen fluid thermal instability Vadasz number viscosity viscoelasticity The onset of thermal instability in a fluid saturated in a porous medium heated from below is now regarded as a classical problem due to its wide range of applications in geothermal reservoirs...

... is an extension of Zhang’s work and is presented as a step toward obtaining a better understanding of the effects of fluid viscosity and sand-particle size on measured and calculated erosion ratios, where erosion ratio is defined as the ratio of mass loss of material to mass of solid particles. The erosion ratios...

... the junction in the vertical segment of the pipe is usually unchanged. Here, new data for air and more viscous liquid are presented. They have been acquired from electrical resistance measurements made between pairs of flush-mounted ring conductance probes located around the junction. Liquid phase viscosities...

... of particles in the calculation domain was investigated, with a focus on the solid shear viscosity. Another purpose of this research was to present the possibility of modeling the development of the vapor phase in the commercial CFD software package, while taking into account the impact of particles...

... scale (SGS) turbulence model, based on a local estimate of the subgrid scale turbulent kinetic energy k sgs and implicit damping of turbulent SGS viscosity ν t ( sgs ) in the near-wall region, was selected as a suitable basis for the present LES computations due to the fact that block structured MPI...

... compressible flow flow separation flow simulation Mach number Navier-Stokes equations numerical analysis stagnation flow subsonic flow viscosity The stall of airfoils is a basic phenomenon in aerodynamics which refers to the significant and sudden loss of lift, increase of drag, and change...

.... Results of this study revealed the leading role of parameters such as viscosity, porosity, density, velocity and mean hydraulic diameter of pores of foam. Since there are several parameters affecting the problem, dimensional analysis was adopted as a convenient approach. Euler number, porosity and two...

... equations for velocity and shear stress profiles were derived for N layers with known viscosities, assuming steady laminar flow in a microchannel driven by pressure and/or electro-static (Coulomb) forces. Numerical simulation results, using a commercial software package, match analytical results for fully...

... = dimensionless axial perturbation velocity We = Weber number ( v 2 aρ /σ) X = dimensionless axial coordinate x = axial coordinate Z = Ohnesorge number [μ/( ρ σ a ) 0.5 ] Greek Letters ζ = radial development over the jet surface μ = dynamic viscosity ν...

... viscosity drops undergoing unsteady shear flows. The stationary shape and the interfacial velocity of a drop are used in order to obtain the contribution of the drop to the effective stress tensor of the emulsion. A complex rheology including the nonlinear frequency response of the emulsion under...

... is applied to present a solution which spans a wide range of the main parameters (the Darcy number (Da), viscosity ratio (M), and Forchheimer number (F)). The analytical results are compared with data available in the literature, and excellent agreement is found. The paper is capable of addressing...

... not only on droplet mean size, but also on droplet velocity, distribution, events of breakup and collision, Weber number, Ohnesorge number and their evolutions. Conclusions. Results show liquid viscosity has a slight effect on the droplet size and its distribution. While a decrease in liquid surface...

.... The mixing performance was assessed using flow visualization techniques. The effects of fluid viscosity on mixing time were investigated. The results are very encouraging and are suggestive that the use of synthetic jets in mixing is a viable alternative to the conventional methods of mixing in vessels...

...Jing Yang; Lingjiu Zhou; Zhengwei Wang Cavitation around a hydrofoil has significant three-dimensional features. The full cavitation model and a RNG k−ɛ turbulence model with a modified turbulence viscosity coefficient and which related to the vapor and liquid densities in the cavitating region...

...Kirti Chandra Sahu The nonparallel linear stability analysis of flow through a slowly diverging pipe undergoing viscous heating is considered. The pipe wall is maintained at constant temperatures and Nahme’s law is applied to model the temperature dependence of the fluid viscosity. A one-parameter...

...Subhendu Maity; Hari Warrior The present state-of-the-art ocean models use an eddy viscosity that depends on structure parameter (C μ ). In this paper we use a Reynolds stress anisotropy based formulation for the eddy viscosity because in addition to the value of turbulent kinetic energy, it also...

... also increases. Meanwhile, the transferred torque reduces when considering the effect of temperature. 29 05 2010 07 04 2011 11 05 2011 11 05 2011 film flow liquid films oils rotational flow viscosity oil film drive characteristics transferred torque rotating...