Computer Science
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.527l&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Computer Science
Scientific paper
into a GAS Canister ( GAS-761) on board of NASA Space Shuttle. The experiment results, on Endeavour shuttle flight STS-108 on December 2001, are analysed. to measure the movement of a paraffin drop inside a tube with water, when temperature gradients exist inside the liquid. The temperature gradients are controlled by an on board computer, specially designed, which controls the temperature gradients and measures the velocity of the paraffin drop during all the flight. This computer program is able to distinguish among different situations including safety conditions and to invert the thermal gradient, in order to achieve alternate movement of the drop. This experiment has obtained data for approximately 8 days. 1- The microcontroller system finds the sphere of paraffin by means of 8 phototransistors and photodiodes. 2- Start of heating the water with a resistor mounted on the tube - cap. The current is 3- When the temperature in both sensors reaches 60 °C or more, the microcontroller will 4- The photosensors record the sphere position and the time in eeprom memory. 5- When the paraffin reaches liquid state, the experiment to measure Marangoni convection 6- The algorithm on the microcontroller decides which extreme should be heated and the 7- This experiment continues until it reaches memory capacity with a max. duration of 10 8- The microcontroller system enters in low power consumption. pressure due to water heating, and freezing of the water experiment. velocity prediction of the classical theory (N. Young, J. Goldstein and M. Block; J.Fluid Mech., Vol.6, 350-356, 1959).
Lässig Jörg
Monte G.
Quiroga J.
Rivera Cristian
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