Drag reduction and degradation behaviour of polyethylene oxide dilute water solutions in turbulent pipe flow.

Ghassan, Ali Diyab


Drag Reduction via Phase Randomization in Turbulent Pipe Flow
Tugluk, Ozan; Tarman, Hakan I. (2015-09-18)
In this study, possibility of reducing drag in turbulent pipe flow via phase randomization is investigated. Phase randomization is a passive drag reduction mechanism, the main idea behind which is, reduction in drag can be obtained via distrupting the wave-like structures present in the flow. To facilitate the investigation flow in a circular cylindrical pipe is simulated numerically. DNS (direct numerical simulation) approach is used with a solenoidal spectral formulation, hence the continuity equation is ...
Drag measurement of different car bodies via balance technique and momentum integral method
Çaylan, Gülsüm; Albayrak, Kahraman; Department of Mechanical Engineering (2014)
In this thesis study, Ahmed Body and MIRA Notchback model were investigated experimentally. The drag coefficients of reference models were measured at three different Reynolds number via balance technique. The wakes of reference models were also investigated and the suitable location in order to measure the drag coefficient was determined via momentum integral method. Surface pressure of two different types of vehicle models was measured at three different Reynolds number. The wakes of Ahmed Body which has ...
Drag Analysis of a Supersonic Fighter Aircraft
Akgün, Osman; Golcuk, Ali İhsan; Kurtuluş, Dilek Funda; Kaynak, Ünver (null; 2016-07-15)
For aircraft design, drag optimization is very important for having better flight performance and less fuel consumption. In this study, drag effects of fuselage, wing and tail section are separately analyzed using a generic F-16 fighter aircraft model in ANSYS Fluent CFD tool with polyhedral mesh. Pressure drag and viscous drag effects are shown on different section of the aircraft as fuselage, wing, vertical tail and horizontal tail. Drag values are presented on subsonic, transonic and supersonic flights.
Friction analysis in cold forging
Cora, Ömer Necati; Akkök, Metin; Department of Mechanical Engineering (2004)
Friction is one of the important parameters in metal forming processes since it affects metal flow in the die, forming load, strain distribution, tool and die life, surface quality of the product etc. The range of coefficient of friction in different metal forming applications is not well known and the factors affecting variation are ambiguous. Commercially available FEA packages input the coefficient of friction as constant among the whole process which is not a realistic approach. In this study, utility o...
Taşeli, Hasan; KAFALI, K (1989-01-01)
Citation Formats
A. D. Ghassan, “Drag reduction and degradation behaviour of polyethylene oxide dilute water solutions in turbulent pipe flow.,” Middle East Technical University, 1975.