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Re: Bernoulli Principle, 2nd try



I haven't done it, but I would bet that the Bernoulli results would emerge
from an "Interactive Physics" simulation of molecular interactions among
flowing molecules confined to a pipe with a built in change of
cross-sectional area.

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor
----- Original Message -----
From: "Tucker Hiatt" <thiatt@USFCA.EDU>
To: <PHYS-L@lists.nau.edu>
Sent: Monday, June 30, 2003 2:36 AM
Subject: Bernoulli Principle, 2nd try


| At 3:57 PM -0400 6/25/03, Wolfgang Rueckner wrote:
| >My question is this -- can one make an argument about what the
| >pressure difference ought to be from a molecular motion point of
| >view? And I'm not talking about a detailed kinetic theory of gases
| >derivation but rather a plausible argument that could be used in an
| >introductory physics course.
|
| I appreciate your question very much, Wolfgang. I am disappointed
| that the answer seems, so far, to be "No; no one (on PHYS-L) *can*
| explain Bernoulli's Principle from a molecular point of view."
|
| I certainly wish I could do it. Many of my introductory students
| enjoy learning about the Bernoulli effect, and then are disappointed
| when I am unable to explain it. I am able to take a molecular point
| of view in explaining other fluid phenomena (e.g., static pressure,
| buoyancy, capillarity, and Pascal's Principle), but not Bernoulli's
| Principle.
|
| So, forgive me PHYS-Lers, but I must re-issue Wolfgang's question:
| FROM A MOLECULAR POINT OF VIEW, WHY DOES FLUID PRESSURE VARY WITH
| FLUID SPEED?
|
| - Tucker