Return-Path: Received: from fed1rmmtao04.cox.net ([68.230.241.35] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 613004 for flyrotary@lancaironline.net; Wed, 19 Jan 2005 10:32:07 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.35; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao04.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20050119153136.FJGT23615.fed1rmmtao04.cox.net@BigAl> for ; Wed, 19 Jan 2005 10:31:36 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Comparison of pressure drops with different coolants Date: Wed, 19 Jan 2005 07:31:51 -0800 Message-ID: <000001c4fe3b$ffd71db0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4FDF8.F1B3DDB0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4FDF8.F1B3DDB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 I would greatly appreciate it if someone with knowledge of fluids could check my work.=20 =20 Alex; =20 Nice work; and interesting. It looks good to me; but my knowledge was = too limited to verify the formula for the friction factor. =20 Typically our tube diameters are less than 2=94; maybe 1 =96 1 =BD=94, = which increases the percentage difference a bit. But also in the typical = system the biggest chunk of pressure drop is through the radiator, where I = think the velocities in the tubes may get up to more like 10 =96 15 ft/sec. = It is interesting that using the model for small diameter tube with high = velocity, the difference between the coolants decreases somewhat. That seemed counterintuitive. I realize that a flat tube is different than the = round tube model, but it still may give a clue. =20 Al ------=_NextPart_000_0001_01C4FDF8.F1B3DDB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 

I = would greatly appreciate it if someone with knowledge of fluids could check my work. =

 

Alex;

 

Nice work; and interesting.=A0 It looks good to me; but my knowledge was too limited to = verify the formula for the friction factor.

 

Typically our = tube diameters are less than 2”; maybe 1 – 1 =BD”, which = increases the percentage difference a bit.=A0 But also in the typical system the = biggest chunk of pressure drop is through the radiator, where I think the = velocities in the tubes may get up to more like 10 – 15 ft/sec.=A0 It is = interesting that using the model for small diameter tube with high velocity, the = difference between the coolants decreases somewhat. That seemed = counterintuitive.=A0 I realize that a flat tube is different than the round tube model, but it = still may give a clue.

 

Al

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