Lecture 6

# Lecture 6 - Announcements Prelim(in class open book and...

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Announcements Prelim (in class, open book and notes) Mon. Mar 15 Today : Data analysis for viscometer Introduction to LabVIEW Homework #2 will be posted on the blackboard today

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Data Analysis For Stokes flow (Re d ≤1): F d = 6 πμ rV t Calculate the apparent viscosity μ (r/R) from a steady state force balance: Fd = Fg - Fb 6 πμ rV t = m b g – (4/3) π r 3 ρ g Now we compare results with two empirical expressions: Schottenheimer: μ (r/R)= μ (0)exp(Kr/R) where K=3.8 Dinsdale and Moore: μ (r/R)/ μ (0)=1/[1-2.104(r/R)+2.09(r/R) 3 -0.95(r/R) 5 ]
Step 1: Use μ (r/R) found with the smallest ball (0.125” diameter chrome steel) and calculate μ (0) with each of these empirical expressions. Step 2: Take the average to obtain an unbiased estimate of the true viscosity μ (0) . Step 3: Plot μ (r/R)/ μ (0) vs r/R. Show your data as symbols and compare with the Dinsdale and Moore polynomial and the Schottenheimer expression with k=3.8. Step 4:

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Lecture 6 - Announcements Prelim(in class open book and...

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