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Re: Propellant fluid dynamics at zero-g



This is correct though I hate the term centrifugal
force but anyway . . .

As the mass returns to center through the piping
and exits the spacecraft, there is a decrease in
the moment of inertia and the spacecraft
spins up.  This is because very little of the
angular momentum leaves with the gas exiting
the nozzle or leak.  Since the momentum is
preserved, and the mass is decreasing, the
spacecraft must spin up.

Bob
----- Original Message ----- 
From: "Jon Ogden" <na9d@mindspring.com>
To: "Ulf Kumm" <ulf@symek.de>; <amsat-bb@AMSAT.Org>
Sent: Tuesday, January 09, 2001 12:35 PM
Subject: Re: [amsat-bb] Propellant fluid dynamics at zero-g


> on 1/9/01 2:58 AM, Ulf Kumm at ulf@symek.de wrote:
> 
> > As soon as the motor runs, the sat is accelerated and the fuel
> > will slosh to the 'bottom' of the tank, which is 90 degree apart
> > from the nozzle used while ignition.
> > 
> > So, I still wonder how it can be made sure that propellant flows
> > without any interruption until the tank is empty.
> 
> Wouldn't the fuel in a spinning spacecraft be pushed to the side walls of
> the fuel tank due to centrifugal forces?  In effect, the spinning motion
> creates an artificial gravity.  Correct?
> 
> 73,
> 
> Jon
> NA9D
> 
> -------------------------------------
> Jon Ogden
> NA9D (ex: KE9NA)
> 
> Member:  ARRL, AMSAT, DXCC, NRA
> 
> http://www.qsl.net/ke9na
> 
> "A life lived in fear is a life half lived."
> 
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