Abstract Singing is one of the problems that occurs in propeller. However, singing will not happen to every a lot high-speed propellers and on with wide thin blade sizes. One ships have high speed propeller fast patrol boat. To overcome this problem, modifying trailing edge most commonly used methods. Sharpening way reduce vortex shedding. change shape propeller, which can affect performance Th...

Finding new ways for traveling at a high commercial speed, comfortable, safe, cheap and preserving as much as possible the environment by using less fuel is the new challenge for the public transport operators that run their business in the 21st century. One of the alternatives for the passengers that are using public transportation vehicles is to travel using water buses or ferries. The paper ...

with speed increasing in high-speed trains, due to limitations of other types of brakes, aerodynamic brake has become an important braking method. in this task to make better use of brake’s panel different configurations are examined and the best panel shape which provides the reasonable drag coefficient is introduced. the results of simulations are carried out with the computational fluid dyna...

experimental work was carried out to investigate the influence of impeller speed, granulation time, binder mass and their interactions on granule size distribution, mean size and binder content distribution in a conical high shear granulator. it was observed that the response of high shear granulation to changes in process parameters varies significantly from one operating condition to another....

in the present study a quasi 2-d numerical model is developed for calculating air concentration distribution in rapid flows. the model solves air continuity equation (convection diffusion equation) in the whole flow domain. this solution is then coupled with calculations of the free surface in which air content in the flow is also considered. to verify the model, its results are compared with a...

scaling challenges and limitations of conventional silicon transistors have led the designers to apply novel nano-technologies. one of the most promising and possible nano-technologies is cnt (carbon nanotube) based transistors. cnfet have emerged as the more practicable and promising alternative device compared to the other nanotechnologies.  this technology has higher efficiency compared to t...

The research was carried out by numerical methods of small scientific trimaran boat with ADCP-profiler as ship's appendages in the range Froude numbers from 0,19 - 0,316. For тnumerical simulation used FineMarineTM software. Numerical modeling performed for a without an installed and two mounting options at different locations along length depth. Two types fastening were studied. Mounting devic...