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The conquest of Weightlessness Collection of Presentations Danail Obreschkow, Feb. 2006.

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Presentation on theme: "The conquest of Weightlessness Collection of Presentations Danail Obreschkow, Feb. 2006."— Presentation transcript:

1 The conquest of Weightlessness Collection of Presentations Danail Obreschkow, Feb. 2006

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3 Feel Weightlessness & Gravity Insight in 0g-Research GOALS

4 1 Weightlessness 2 Cavitation 3 Sensations 4 Results 5 Next Step 6 Beyond

5 Weightlessness and Free Fall 1

6 Weightlessness = Free Fall  Weightlessness = Free Fall ≠ Zero Gravity Inertial force Gravitational force Gravitational force Inertial force Net Force  Weightlessness = Free Fall = Zero Gravity Gravitational force Gravitational force No net Force

7 Free Fall Trajectories

8 Free Fall Technologies Drop Tower 5 seconds Parabolic Flight 25 seconds Sounding Rocket 12 minutes Space Ship weeks

9 Who ? etc.

10 Why ? BiologyFluid dynamics Medicine & Psychology Physics & Chemistry

11 About Cavitation 2

12 Phenomenon of Cavitation Tiger Pistol Shrimp: Shockwave kills small fish in 2 meters distance !

13 Cavitation in Technology Damage Concerned Technologies Questions: Last Stage of Cavity Collapse ? Interactions with Surfaces ?

14 Last Stage of Collapse Shock WaveMicrojetSonoluminescence”Cold” Fusion Supersonic GPa Subsonic-sonic Sharp Point-like K Erosion Vibration Efficiency loss ???

15 Interaction with Free Surface

16 Experimental Access Problems: Water volume never isolated Free surfaces always flat + – Electrical discharge Laser

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18 Goal Confined shockwave Observe all liquid jets Interaction with spherical free surface Water Drop Cavitation Bubble NB: Drawn before the experiment !

19 Setup

20 Functional Units

21 Drop Formation & Fixation

22 Here we go !

23 Sensation of Weightlessness 3

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25 Flight Maneuver 31 parabolas per flight inside a military flight zone

26 Movies

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29 Phenomenology Initial stomach lift No up, no down Feather weight – Stone mass

30 Below and above

31 Above and below

32 Medical aspects Scopolamin Promethazin

33 Results 4

34 Real Motion 10 mm

35 Slow Motion 10 mm

36 Ultra Slow Motion 10 mm

37 Drop Formation 1/e damp out time = 0.7s Negligible interaction Repulsion by electrodes Attraction by electrodes

38 Stability of Drop and Free Surface

39 Bubble Size Evolution Model Experiment Validation Prediction

40 Counterjet Geometry Planar free surface (ground experiment) Spherical free surface (microgravity experiment) bubble [Robinson et al. 01] Free Surface High pressure Numerical Simulation

41 Shockwave-Nuclei Interaction 0.0ms0.08ms0.16ms Shockwave Energy New channel for erosion

42 Jet-pair Instabilities Counterjet Geometry Bubble Collapse Shock Wave Unexpected Hair-jets

43 Next Step 5

44 Catch the Shock Wave !

45 Sparkling Water

46 Beyond… 6

47 Dilemma of Choice

48 Symbol of Political Power

49 Ozone Hole Sep 18, 1979Sep 17, 2001

50 UESCO World Heritage Site Iguaçu

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