Article 31812 of alt.solar.thermal: Path: news.misty.com!not-for-mail From: nicksanspam@ece.villanova.edu Newsgroups: alt.sci.physics,sci.physics,alt.solar.thermal Subject: Re: Thermal flow in aluminum Date: 8 Mar 2009 04:03:35 -0400 Organization: Villanova University Lines: 15 Message-ID: References: NNTP-Posting-Host: acadia.ece.villanova.edu X-Trace: max.inside.misty.com 1236499416 26901 153.104.44.130 (8 Mar 2009 08:03:36 GMT) X-Complaints-To: abuse@misty.com NNTP-Posting-Date: Sun, 8 Mar 2009 08:03:36 +0000 (UTC) Xref: news.misty.com sci.physics:1612746 alt.solar.thermal:31812 wrote: >On the issue of fin thermal performance vs width and thickness, some >of the solar design books define a fin efficiency that compares a >given fin to a perfectly conductive fin. It depends on the width, >thickness, and conductivity of the fin material... Equation 2.42 on page 27 of the 1998 2nd edition of Schaum's Outline on Heat Transfer resembles that remark: q = k A n thetab tanh(nL), where q is heatflow, and k is the fin conductivity, and thetab is the difference between the fin base temp and the surrounding fluid, and A = wt, and w and t are width and thickness, and n = sqrt(2hbar/kt). Nick