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-----Original Message-----Is it true that inside the tube out of which the water is flowing, the velocity is parallel to the centerline of the tube, so that, inside the tube, the water has no transverse velocity but outside the tube it has an inward-directed, decreasing, transverse velocity? If so, that suggests that the water must get an inward kick upon exiting the tube.
From: Phys-l <phys-l-bounces@mail.phys-l.org> On Behalf Of John Denker
via Phys-l
Sent: Thursday, February 7, 2019 2:21 PM
To: Phys-L@Phys-L.org
Cc: John Denker <jsd@av8n.com>
Subject: Re: [Phys-L] fluids
There is a high-school physics concept at work here: explaining the inward
/motion/ is very different from explaining the inward (or outward!) /force/.
The inward motion is simply inherited from the upstream parts of the flow.