Fluid Mechanics Forum

Ok I have received a project from my engineering class at

school and need some help.

Here it is: Please excuse the elementary task!!

Problem: I have to combine 2 liquids by using an injection type method.

The main component is H20 the other to be injected into the line of H20 is Syrup "Viscosity similar to H20".

I have to achieve a constant "set" flow rate of the syrup into the main line of water 

when the water is flowing. 

Without increasing the pressure in the outlet of the pipe?

I mean we want to transfer air from point A to point B using a piping system which is equipped with a fan. Now there is energy lost in the outlet because the air exits with velocity in the atmospheric pressure, so the problem is how to use this energy ( high speed air) without increasing the pressure in the outlet of the fan. offcourse if it was water instead of the air, we could get the energy by installing a turbine next to the outlet pipe and still let the water come out in the atmospheric pressure

Dear all,

I envy the CFD community, due to their http://www.cfd-online.com/Forum/, where a frequent discussion is going on. I have spend some time to find a fluid mechanics related forum, where students and researchers can exchange idears, however I did not find anything. I am not sure if this forum should degenerate to a forum similar to the CFD Forum. Maybe it would be nice if a similar forum could evolve.

I would like to know the average velocity and friction loss in a gravity discharge line. I am pumping water (it is actually a chemical feed that is mostly water so let's just analyze the problem as if it were water) at constant (the pump is positive displacement type with sufficient head to overcome moderate discharge pressures) flow rates (anywhere from 1 to 5 gpm) to a vertical line that runs straight down (vertically) 200 feet into a water reservoir. The vertical pipe is PVC and 1 inch nominal inside diameter (during design it may range for 0.5 inch to 1.0 inch with the exact ID dependent on wall thickness/schedule). The pipe is immersed (i.e., submerged) in the water reservoir 50 feet down (so PVC pipe is actually 250 vertical feet long). There is a backpressure valve at the top of the vertical pipe that will keep the feed line full for immediate discharge to the top of the vertical pipe when the pump is turned on. It is very important in this process application to know how long it will take for the feed to travel the vertical 200 feet distance as immediate (or as near as practical) feed to the reservoir is desired when the process logic turns on the feed.

Hi every body:

I'm searching for some one that can help me about the boundary conditions on the wall for a based fluid including nanoparticles. The most dominant phenomena is the thermophoresis effect, and also close to wall the Brownain effect seems be important.

Thanks/farid

Could anyone explain to me, in a simple approach, how to calculate the delay of water flow along a pipe in response to the boundary condition change, such as pressure?

Thanks,

Xiaoming