Re: Hourglass Question

Message-ID	<59B040CE.429@mindspring.com> (permalink)
Date	2017-09-06 14:39 -0400
From	Ron Hardin <rhhardin@mindspring.com>
Newsgroups	sci.physics
Subject	Re: Hourglass Question
References	<59ADBEA8.5404@mindspring.com>

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Ron Hardin wrote:
> 
> An old question from the 1970s that I never
> figured out.
> 
> What governs the speed of flow of an hourglass?
> 
> I mean what principle.  What's going on.
> 
> It's not viscosity (no transport of x momentum in
> the y direction etc.)
> 
> It seems like it's the time it takes something to
> call out of a lockup condition and clear the mess,
> leaving it up to the next lockup condition, but
> what the hell equation is that?

Try this start: the sand above the hole consists of locked up unstable structures, each 
stabilized by the structure below it.

The one at the bottom goes unstable and falls, freeing the one above to begin going 
unstable.

So there a distance between structures, an instability growth time to collapse.
-- 
rhhardin@mindspring.com

On the internet, nobody knows you're a jerk.

Thread

Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-04 16:59 -0400
  Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-04 17:53 -0500
  Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-05 13:44 -0700
    Re: Hourglass Question benj <benj@nobody.net> - 2017-09-05 19:34 -0400
    Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-06 14:22 -0700
      Re: Hourglass Question benj <benj@nobody.net> - 2017-09-06 18:21 -0400
        Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-06 18:18 -0500
      Re: Hourglass Question hanson <hanson@quick.net> - 2017-09-06 15:35 -0700
      Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-07 13:06 -0700
        Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-07 16:44 -0500
          Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-08 13:34 -0700
            Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-08 15:53 -0700
              Re: Hourglass Question "hanson" <hanson@quick.net> - 2017-09-08 17:36 -0700
              Re: Hourglass Question Double-A <double-a3@hush.com> - 2017-09-11 14:41 -0700
            Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-09 13:31 -0700
              Re: Hourglass Question "hanson" <hanson@quick.net> - 2017-09-09 14:32 -0700
  Re: Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-06 14:39 -0400
    Re: Hourglass Question Serg io <invalid@invalid.com> - 2017-09-06 14:01 -0500
      Re: Hourglass Question Ron Hardin <rhhardin@mindspring.com> - 2017-09-06 18:36 -0400
    Re: Hourglass Question jimp@specsol.spam.sux.com - 2017-09-06 19:26 +0000
  Re: Hourglass Question "reber G=emc^2" <herbertglazier0@gmail.com> - 2017-09-06 14:35 -0700
    Re: Hourglass Question Edward Prochak <edprochak@gmail.com> - 2017-09-06 15:32 -0700
    Re: Hourglass Question hanson <hanson@quick.net> - 2017-09-06 15:44 -0700
  Re: Hourglass Question "nuny@bid.nes" <alien8752@gmail.com> - 2017-09-06 15:50 -0700

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