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Questions 1. Should the terminal velocity of two different size spheres be the same? 2.) Does a larger sphere have a higher terminal velocity? yes, 3. Should the viscosity found for two different size spheres be the same? Why or why not? 4. If different size spheres give different results for the viscosity, what are the error sources? Calculate the % error and account for all known error sources. 5. What are the shortcomings of this method? 6. Why should temperature be recorded. +7. Can this method be used for gases? 8. Can this method be used for opaque liquids? 9. Can this method be used for something like peanut butter, or grease or flour dough? Why or why not? 2 89 MURO
Questions 1. Referring to Figure 7.2, recall that Bernoulli's equation was applied to points 1 and 2 where the pressure difference measurement is made. The theoretical equation, however, refers to the throat area for point 2 (the orifice hole diameter) which is not where the pressure measurement was made. Explain this discrepancy and how it is accounted for in the equation formulation. 2. Which meter in your opinion is the best one to use? 3. Which meter incurs the smallest pressure loss? Is this necessarily the one that should always be used? 4. Which is the most accurate meter? 5. What is the difference between precision and accuracy?
actual flow rate (measured in the laboratory). The ratio of actual to theoretical flow rate leads to the definition of a discharge coefficient: C, for the orifice meter and C, for the nozzle. Ah 2 FIGURE 7.2. Cross sectional view of the orifice meter. ΔΗ 2 FICU