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How does viscosity vary at different flow speeds?

How does viscosity vary at different flow speeds?. Group members: Aye Swe Lwin Geraldine Chan Michelle Lim Su Chang M07107. Teacher-In-Charge: Dr Ng Kai Ling. Introduction. Viscosity is defined as the resistance of a liquid to flow

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How does viscosity vary at different flow speeds?

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  1. How does viscosity vary at different flow speeds? Group members: Aye Swe Lwin Geraldine Chan Michelle Lim Su Chang M07107 Teacher-In-Charge: Dr Ng Kai Ling

  2. Introduction • Viscosity is defined as the resistance of a liquid to flow • The viscosity of ketchup varies unexpectedly when it flows at different speeds. • When pouring the ketchup from the ketchup bottle, the ketchup can flow at unexpected speeds and mess up the whole place. • Our purpose of doing this project is to find out the effect of the ketchup’s flow speed on its viscosity, so that we can control the amount of ketchup poured out on our food.

  3. Experiment design • Three trials will be done for each funnel. • Funnels of different opening sizes are used for each trial to change the flow rate of the ketchup. • The bigger the funnel, the higher the flow rate. • We will measure the time taken for the ketchup, the dependent variable, using a stopwatch.

  4. 5 funnels of different opening sizes • Stopwatch • Measuring cylinder • Container for collecting ketchup • Ketchup(background) Materials

  5. Variables Hypothesis If the flow rate of the ketchup is higher, the less viscous the ketchup will be, thus decreasing the time taken for all the ketchup to flow from of the funnel.

  6. Procedure 1.Pour 30ml of ketchup into the first funnel. Note: Keep the opening of the funnel blocked all the time. 2.Let the ketchup flow to occupy all the space in the stem of the funnel. 3.Place a container below the funnel to collect the ketchup which will flow out. 4.Open the opening of the funnel and start timing the length of time taken by all the ketchup to flow out of the funnel. 5.Stop timing as soon as all the ketchup has flow out into the container. 6.Repeat steps 1-5 three times and average the time taken for the all the ketchup in the funnel to flow out. 7.Repeat steps 1-6 for the four other funnels of different sizes.

  7. Results

  8. Results

  9. Conclusion From our results, we can safely conclude that the larger the funnel, the higher the flow rate and the lower the viscosity.

  10. Limitations • During the experiment ,when all the ketchup was almost going to flow out ,some of the ketchup stayed at the sides of the funnel opening. We used a spoon to move all the ketchup to the middle, careful not pushing the ketchup into the opening. • We reused the ketchup, so some of them could have been “thinner” than the others.

  11. Acknowledgements • Wikipedia, Viscosity, 25 March 2007, from http://www.en.wikipedia.org/wiki/viscosity.com • Transtronic Viscosity, 25 March 2007, from • http://xtronics.com/reference/viscosity.htm • Wisegeek, What is Viscosity,25 March 2007, from http://www.wisegeek.com/what-is-viscosity.htm • http://www.ketchupsurvey.com • www.gifs.net/.../0/20/Condiments?n=login.php3

  12. Done by: Swe Lwin Geraldine Michelle Su Chang M07107

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