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Understanding the actual mechanics of what goes on in flow in pipes
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[COLOR=#000000][FONT=times new roman][IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1503&stc=1[/IMG][/FONT][/COLOR]
[COLOR=#000000][FONT=times new roman]So I'm really trying to understand the actual mechanics of what's going on in a pipe with fluid flow. Not all the equations and maths. So correct me if I'm wrong the floowing examples:[/FONT][/COLOR]
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[COLOR=#000000][FONT=times new roman]1) Reduced from larger pipe to smaller, say 10m of 10mm down to 10m of 5mm pipe. This will reduce pressure and increase velocity. And this is due to the fact that the same volume of water is trying to get through a smaller hole, therefore the same number of molecules are in a more confined space, therefore more chance of bouncing off the pipe walls and causing friction, which reduces the pressure. Also the length of pipe increases the pressure drop due to increased friction over the entire length. [/FONT][/COLOR]
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[COLOR=#000000][FONT=times new roman]2) Pipe with an orifice: Say 20m of 10mm pipe with a coin wedged in it with a hole in the middle of 5mm i.e. at the 10m mark. I'm assuming the pressure will reduce at the orifice and velocity increase temporarily, but by the end of the next 10m it would have returned to it's original pressure & flow[/FONT][/COLOR]
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[COLOR=#000000][FONT=times new roman]3) How about several changes in diameter? Let's say we go from a small diameter pipe, to a larger one, then back to a smaller one, then down to an even smaller one. What's going on in terms of volume flow rate, pressure, and velocity in the pipe and at the source, and at the outlet?[/FONT][/COLOR]
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[COLOR=#000000][FONT=times new roman]Many thanks[/FONT][/COLOR]