Simon:
thank you for the info. You are right, there are some developments and experiments related with devices like high torque motors, but in general I can't find info about what happens with the ferrofluid in terms of change in viscosity, pressure gradients, heat generation due to internal...
vishwanaya:
v_in=0
I recommend you to read about isentropic flow in order to have a better understanding of the whole phenomenom. For example, you can read the chapter 4: Isentropic Flow, from "The dynamics and thermodynamics of compressible fluid flow", by Ascher Shapiro, a classic book. At...
Simon, thanks for your time. In order with your comments:
In my work as engineer I found many times problems where efficiency in electromagnetic devices like contactors, motors, magnetic cranes (little or big) is needed due to restrictions in available space, power consuption or weight. In some...
Looking for a way to increase magnetic forces in electrical devices, an option is reduce the air gap, but some times it is not a practicable solution.
The question is what happened if we put a ferrofluid between the magnets?
Imagine the following situation: a closed volume composed by a...
I don'n know how is the shape of the submerged body but you can start with a search on google about von karman streets (valid for cilinders). Also you can found some graphs in "theory of boundary layer", a classic book (the author is schligting, I do not remember exactly the spelling).
In my opinion, you must take into account the fluid mechanics involved in the process. If you try to relate pressure with time, you need to solve the pressure drop as transitory effect of fluid flow. This is a complex problem that could have more dependencies that pressure ratio. With enough...