Entropy generation in adiabatic flow of highly concentrated non-Newtonian emulsions in smooth tubes of five different diameters (7.15–26.54 mm) was investigated experimentally. The emulsions were of oil-in-water type with dispersed-phase concentration (φ ) ranging from 59.61–72.21% vol. The emulsions exhibited shear-thinning behavior in that the viscosity decreased with the increase in shear ra...

Asseng, S., Ewert, F., Martre, P., Rötter, R. P., Lobell, D. B., Cammarano, D., Kimball, B. A., Ottman, M. J., Wall, G. W., White, J. W., Reynolds, M. P., Alderman, P. D., Prasad, P. V., Aggarwal, P. K., Anothai, J., Basso, B., Biernath, C., Challinor, A. J., de Sanctis, G., Doltra, J., Fereres, E., Gayler, S., Hoogenboom, D., Hunt, L. A., Izaurralde, R. C., Jabloun, M., Jones, C. D., Kersebaum...

In this study, a 3D combustion chamber was simulated using FLUENT 6.32. Aims to obtain accurate information about the profile of the combustion in the furnace and also check the effect of oxygen enrichment on the combustion process. Oxygen enrichment is an effective way to reduce combustion pollutant. The flow rate of air to fuel ratio is varied as 1.3, 3.2 and 5.1 and the oxygen enriched flow ...

Abstract The authors of the work numerically studied aerodynamic coefficients sail blade, during which patterns three-dimensional flow around airflow and pressure distribution field were obtained. triangular blade is used as power element wind turbines. modeling was based on Reynolds-averaged Navier–Stokes equations (RANS) using ANSYS FLUENT computer program. A pattern obtained, gives a physica...

The variation in stability derivatives with airspeed and angles of attack sideslip is determined using only the dependence aerodynamic forces moments on modulus direction velocity. Analytic extrapolation factors are obtained for all 12 longitudinal plus lateral linear decoupled motion. relate two flight conditions different airspeeds, (AoA), (AoS). formulas were validated by comparison results ...

In this investigation the Reynolds-Averaged Navier-Stokes (RANS) equations are modified to account for variable density and viscosity of the two-fluids flow (i.e. water-air), assuming both fluids compressible. By introducing a preconditioner, the governing equations in terms of primitive variables are solved for both fluids in a unified manner. The non-conservative implicit Split Coefficient Ma...

The ability to accurately predict fan noise is important in designing and optimizing aircraft engine turbofans for low noise emissions. In this paper, a prediction methodology for exhaust fan tone noise analysis is described and validated against various canonical test cases and NASA Source Diagnostic Test (SDT) data. The prediction process consists of solving Reynolds-Averaged Navier-Stokes (R...

One of the most efficient methods of reducing drag on planing craft is the use of transverse step on the bottom of a hull. Applying steps on the hull reduces the contact area with water and as a result, it reduces drag of the craft. Planing craft are able to have one or two transverse steps. In this paper, numerical hydrodynamic performance of the stepped planing craft and its step height effec...

Recent advances in the theory of turbulent solutions of the Navier-Stokes equations are discussed and the existence of their associated invariant measures. The statistical theory given by the invariant measures is described and associated with historically-known scaling laws. These are Hack’s law in one dimension, the Bachelor-Kraichnan law in two dimensions and the Kolmogorov’s scaling law in ...