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

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Presentation transcript:

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

Feel Weightlessness & Gravity Insight in 0g-Research GOALS

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

Weightlessness and Free Fall 1

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

Free Fall Trajectories

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

Who ? etc.

Why ? BiologyFluid dynamics Medicine & Psychology Physics & Chemistry

About Cavitation 2

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

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

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

Interaction with Free Surface

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

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

Setup

Functional Units

Drop Formation & Fixation

Here we go !

Sensation of Weightlessness 3

Flight Maneuver 31 parabolas per flight inside a military flight zone

Movies

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

Below and above

Above and below

Medical aspects Scopolamin Promethazin

Results 4

Real Motion 10 mm

Slow Motion 10 mm

Ultra Slow Motion 10 mm

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

Stability of Drop and Free Surface

Bubble Size Evolution Model Experiment Validation Prediction

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

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

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

Next Step 5

Catch the Shock Wave !

Sparkling Water

Beyond… 6

Dilemma of Choice

Symbol of Political Power

Ozone Hole Sep 18, 1979Sep 17, 2001

UESCO World Heritage Site Iguaçu