> And the one line of C code is.....???? > > Lawrence Lile (taken from:) From: "Mark Folsom" Newsgroups: alt.sci.physics,sci.physics Subject: Re: Question about Specific heat and conductivity experiment. Date: Tue, 20 Mar 2001 16:51:38 -0800 Here's what I posted before on the topic: "In the range of Reynolds numbers from 3 to 100, the empirical correlation between the Nusselt modulus and the Reynolds and Prandtl numbers for cross flow over a tube is (Principles of Heat Transfer 3rd ed., Frank Kreith) Nu = 0.82*Pr^.3*Re^.4 where Nu = hc*D/k, k is thermal conductivity, hc is the film heat transfer coefficient, D is the diameter of the tube, Pr = Cp*mu/k, Cp is specific heat, mu is kinematic viscosity, Re = V*D*rho/mu, V is fluid velocity, rho is fluid density. This can be reorganized to give you the film heat transfer coefficient in terms of properties we are familiar with: hc = 0.82 * Cp^.3 * k^.7 * rho^.4 * V^.4/(D^.6 * mu^.1). The properties of the oil are Cp, k, rho and mu. Heat capacity per unit volume doesn't vary much unless there are phase changes or reactions involved. Reduced viscosity could help a little." The above indicates that thermal conductivity is more important than heat capacity, but that could change at higher flow rates. Mark Folsom --end of quote-- -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu