SOHC.co.uk Forums > CB500/550
fuel tap
Sesman:
The petrol will flow in each pipe proportional to the resistance to flow path, not just in one path because the other has a higher flow resistance! There are other technical aspects to fluid flow that differentiate it from electricity: vacuum for example. I suspect that if each outlet flows independently you don’t have a problem. I’d connect both spigots and run the bike. If you suffer fuel starvation you will soon know!
Sesman:
--- Quote from: Bryanj on December 27, 2024, 08:53:56 PM ---Try it see what happens, 99.9% certain petrol will piss out of the unconnected spigot, as to the electrickery take two leads from a battery pos and connect one to the neg via a bulb then connect the other direct to the negvand see if the bulb stays lit! Always takes path of least resistance
--- End quote ---
Nope. The resistance in each leg determines the proportional flow rate. Your ‘experiment’ simply confirms connectivity. Look up Norton, Thevenin and superposition theory.
Sesman:
An example:
A 10V supply and two parallel conductors of 1 ohm and 2 ohms respectively.
The total current flowing will be approximately 15A with 10A flowing down the 1ohm leg and 5A down the 2ohm leg. Of course things get significantly more complicated when dealing with alternating currents and reactive components (capacitors and inductors). I am of course completely disregarding source impedance, which is the source current limiting factor.
Remove the 1ohm leg and 5 amps will flow in the 2ohm leg. Alternatively, remove the 2ohm leg and 10amps total will flow down the 1ohm leg.
What’s happened to the missing amps I hear you shout…😀😀
McCabe-Thiele (Ted):
When I studied fluid dynamics at Uni back in 1967-1971 the lecturer used the analogy of Pressure v Voltage, Flow rate v Current. It held up pretty well until we got to non laminar flow
Sesman:
Absolutely,Ted. Our lecturers explained third order equations and reaction to input forces using the electrical properties of resistance, capacitance and inductance interchangeably with springs, dampers and fluid. It worked for a short while then things began to get more complicated 🫣.
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