RE: Delayed not failed27 Jun 2018 21:01
One bar is 14.7 psi.
By closing the pipe down with your fingers to get the squirting effect you are restricting the flow right down to represent near to the static pressure in the pipe, which, if the height is 30ft above the end of the pipe the pressure is about 15 psi at the pipe end.
If you remove your fingers and let the pipe flow without restriction at the end, you will notice the flow rises only a few inches, maybe 12 inches or so, above the end of the pipe, showing that where there is a flow the pressure now drops dramatically.
Each hydraulic system model is different and depends on many hydraulic features: head, pressure, pressure change, velocity, orifices, sunken orifices, venturis, bends, throttles and so on and so on. So direct comparison cannot be made with any other hydraulic system.
The hydralics of the engine cooling system of the high speed train was so different to any similar systems that it caused overheating in the 1980's with continuous loss of cooling until the reasons were found and a modifed system designed. Leakage problems also caused severe coolant loss. Meanwhile the drivers were provided with a 40 gallon drum of coolant in their cab which they pumped continuously into the system with a semi rotary hand pump during the journeys. The high speed train engines now continue to run and do so successfully.
So let it be said ICE2 is not the first system with problems which have to be overcome, and will be overcome.