[AR] Re: Falcon 9 flight today
- From: JMKrell@xxxxxxx
- To: arocket@xxxxxxxxxxxxx
- Date: Wed, 9 Oct 2013 03:16:39 -0400 (EDT)
My data lists RP-1 vapor pressure at <2 Torr @20C. In the earth's shadow,
space is very cold.
In a message dated 10/8/2013 5:34:51 P.M. Pacific Daylight Time,
hkeithhenson@xxxxxxxxx writes:
The vapor pressure of RP-1 at 50 deg F is given as 0.031 psia.
That's not high, but open to space, the stuff is going to evaporate
unless, as Henry says, it's awful cold.
On Tue, Oct 8, 2013 at 4:00 PM, Henry Spencer <henry@xxxxxxxxxxxxxxx>
wrote:
> On Tue, 8 Oct 2013 JMKrell@xxxxxxx wrote:
>> > The vapor pressure of RP-1 isn't large by Earth standards, but it's
>> > still substantial by vacuum standards. The RP-1 won't stay in the
>> > tank, although it may leave a bit of residue behind.
>>
>> Henry, I agree with 99.9% of what you post, but on this I must go with
>> my empirical data. Some RP-1 is expelled during the venting of the RP-1
>> tank. The rest quickly gels and solidifies within the tank. Frozen
>> fluids under high vacuum transfer mainly between hot and cold
>> junctions... Most of the RP-1 remains a solid until the vehicle reenters
>> the atmosphere.
>
> Is that empirical data published? If so, references please! I have
> trouble believing that the solid would be stable in vacuum for any length
> of time, unless the thermal situation was very unusual.
>
> Henry Spencer
> henry@xxxxxxxxxxxxxxx
> (hspencer@xxxxxxxxxxxxx)
> (regexpguy@xxxxxxxxx)
>
>
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