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  1. BRAZILIAN TEAM 17th IYPT - AUSTRALIA - Brisbane - 24th June to 1st July

  2. 14. Fountain Construct a fountain with 1m ‘head of water’. Optimise the other parameters of the fountain to gain the maximumjet height by varying the parameters of the tube and by using different water solutions. By Luíza de Almeida Aoki

  3. Introduction I. Applications of the study Irrigation Fuel injection

  4. Methodology I. Bibliographic research II. Theory and experiment for maximum jet height III. Determination of the Relevant Parameters IV. Maximization of the jet height

  5. a) Thin b) Thick General View I. Tank -> Mariotte siphon II. Tube -> Wide diameter III. Nozzle -> Smooth IV. Jet


  6. Hidrostatics From Bernoulli Eq. a) Laminar flow Poisseuille Law Where b) Turbulent flow From Prandtl one-seventh power law Turbulence discussion Mathematical Analysis I. Jet escape speed on the nozzle

  7. From Stokes Law: Motion: Solving: Where Finally Other influences on jet height Mathematical Analysis II. Jet height dependence

  8. Water Solutions I. Density II. Viscosity III. Surface tension (temperature) IV. Viscoelastic solutions (polimers)

  9. Experiment Calibration of the Mariotte Siphon General Schematic Detail of the Mariotte Siphon

  10. Experiment Jet top detail Jet escape Nozzle detail Practical measure

  11. Experimental Data I. Theory validity II. Proposition of the optimal parameters

  12. Source of Errors • Loss of energy • Imprecision on the measure • Air resistance