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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-5812727@logan.com>
In-Reply-To: <list-5812727@logan.com>
Subject: Temperature rise Re: [FlyRotary] Re: skydivers-supersonic-24-mile-jump
Date: Mon, 15 Oct 2012 17:19:49 -0400
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Temperature  of a gas is based on the relative velocity of the =
atoms/molecules - so where the air is thin the average velocity of the =
molecules is much higher because they don't "bump" into other molecules =
as frequently.  So once you leave the troposphere, the temperature =
starts to increase at some point and continues to increase into space.

 In outer space the "temperature" is in the thousands (or more degrees) =
- but because the density is so very low there is not any "heat" content =
to mention in a cubic unit of air - so no risk of frying our astronauts =
(at least due to ambient temperature)

As you go lower, the air becomes denser, the average velocity of the air =
molecule slows down (temperature drops) and even though the air mass per =
cubic unit is increasing,  the  drop in velocity causes the ambient =
temperature to become colder.
.

At least that is best I recall if from long ago

Ed


From: marv@lancair.net=20
Sent: Monday, October 15, 2012 2:54 PM
To: Rotary motors in aircraft=20
Subject: [FlyRotary] Re: skydivers-supersonic-24-mile-jump








Jarrett Johnson <hjjohnson@sasktel.net> wrote:

"""=20
Some of that temp rise will be aerodynamic heating. I know at 280knts =
and=20
24,000ft I'm seeing 10-15decC rise in temp... At 800+mph the temp rise =
would=20
be a lot higher, even at 70K+ ft.
"""
Airspeed definitely wasn't the case here.. this was during the ascent, =
when he was rising about 1000fpm, maybe less (don't remember exactly) =
but his speed over the ground had by then diminished to 15-20 knots, =
just floating along with the flow up there.  I, too, am curious about =
why ambient temps started to rise as altitude increased... I'd have =
figured it to just keep going down right in step with the ambient =
pressure.  It'll be way interesting to hear the actual reason.


  <marv>



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Homepage:  http://www.flyrotary.com/

Archive and UnSub:   =
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http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 9.00.8112.16450"></HEAD>
<BODY style=3D"PADDING-LEFT: 10px; PADDING-RIGHT: 10px; PADDING-TOP: =
15px"=20
id=3DMailContainerBody leftMargin=3D0 topMargin=3D0 =
CanvasTabStop=3D"true"=20
name=3D"Compose message area">
<DIV><FONT face=3DArial>Temperature&nbsp; of a gas is based on the =
relative=20
velocity of the atoms/molecules - so where the air is thin the average =
velocity=20
of the molecules is much higher because they don't "bump" into other =
molecules=20
as frequently.&nbsp;&nbsp;So once you leave the troposphere, the =
temperature=20
starts to increase at some point and continues to increase into=20
space.</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>&nbsp;In outer space the "temperature" is in the =
thousands=20
(or more degrees) - but because the density is so very low there is not =
any=20
"heat" content to mention in a cubic unit of air - so no risk of frying =
our=20
astronauts (at least due to ambient temperature)</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>As you go lower, the air becomes denser, the =
average=20
velocity of the air molecule slows down (temperature drops) and even =
though the=20
air mass per cubic unit is increasing, &nbsp;the&nbsp; drop in velocity =
causes=20
the ambient temperature to become colder.</FONT></DIV>
<DIV><FONT face=3DArial>.</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>At least that is best I recall if from long=20
ago</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>Ed</FONT></DIV>
<DIV><BR></DIV>
<DIV style=3D"FONT: 10pt Tahoma">
<DIV style=3D"BACKGROUND: #f5f5f5">
<DIV style=3D"font-color: black"><B>From:</B> <A =
title=3Dmarv@lancair.net=20
href=3D"mailto:marv@lancair.net">marv@lancair.net</A> </DIV>
<DIV><B>Sent:</B> Monday, October 15, 2012 2:54 PM</DIV>
<DIV><B>To:</B> <A title=3Dflyrotary@lancaironline.net=20
href=3D"mailto:flyrotary@lancaironline.net">Rotary motors in =
aircraft</A> </DIV>
<DIV><B>Subject:</B> [FlyRotary] Re:=20
skydivers-supersonic-24-mile-jump</DIV></DIV></DIV>
<DIV><BR></DIV>
<DIV style=3D"FONT: 10pt arial,helvetica,sans-serif"=20
id=3D_htmlarea_default_style_><BR><BR><BR><BR><BR><BR>Jarrett Johnson =
&lt;<A=20
href=3D"mailto:hjjohnson@sasktel.net">hjjohnson@sasktel.net</A>&gt;=20
wrote:<BR><BR>"""=20
<DIV align=3Dleft>Some of that temp rise will be aerodynamic heating. I =
know at=20
280knts and <BR>24,000ft I'm seeing 10-15decC rise in temp... At 800+mph =
the=20
temp rise would <BR>be a lot higher, even at 70K+ ft.<BR>"""</DIV>
<DIV align=3Dleft>Airspeed definitely wasn't the case here.. this was =
during the=20
ascent, when he was rising about 1000fpm, maybe less (don't remember =
exactly)=20
but his speed over the ground had by then diminished to 15-20 knots, =
just=20
floating along with the flow up there. &nbsp;I, too, am curious about =
why=20
ambient temps started to rise as altitude increased... I'd have figured =
it to=20
just keep going down right in step with the ambient pressure. =
&nbsp;It'll be way=20
interesting to hear the actual reason.</DIV>
<DIV align=3Dleft><BR></DIV>
<DIV align=3Dleft>&nbsp; &lt;marv&gt;</DIV>
<DIV align=3Dleft><BR></DIV></DIV>
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