Experimental Study of Capillary Effects for Fluid Management under Microgravity Conditions

1992 ◽  
pp. 479-487
Author(s):  
M. Dreyer ◽  
A. Delgado ◽  
H. J. Rath
Keyword(s):  
Experimental Study ◽  
Fluid Management ◽  
Capillary Effects ◽  
Microgravity Conditions

Comprehensive experimental study of heartbeat oscillations observed under microgravity conditions in the PK-3 Plus laboratory on board the International Space Station

2011 ◽  
Vol 18 (5) ◽  
pp. 053701 ◽  
Author(s):  
Ralf J. Heidemann ◽  
Lénaïc Couëdel ◽  
Sergey K. Zhdanov ◽  
K. Robert Sütterlin ◽  
Mierk Schwabe ◽  
...  
Keyword(s):  
Experimental Study ◽  
International Space Station ◽  
Space Station ◽  
International Space ◽  
Microgravity Conditions

Experimental study of surfactant transfer in fluid systems in microgravity conditions

2010 ◽  
Vol 66 (3-4) ◽  
pp. 427-433 ◽  
Author(s):  
K.G. Kostarev ◽  
V.L. Levtov ◽  
V.V. Romanov ◽  
A.V. Shmyrov ◽  
A. Viviani
Keyword(s):  
Experimental Study ◽  
Fluid Systems ◽  
Microgravity Conditions ◽  
Surfactant Transfer

Experimental study on the kinetics of granular gases under microgravity

2009 ◽  
Vol 641 ◽  
pp. 521-539 ◽  
Author(s):  
SOICHI TATSUMI ◽  
YOSHIHIRO MURAYAMA ◽  
HISAO HAYAKAWA ◽  
MASAKI SANO
Keyword(s):  
Experimental Study ◽  
Distribution Function ◽  
Cooling System ◽  
Velocity Distribution Function ◽  
Granular Gases ◽  
Two Dimensional ◽  
Driven Systems ◽  
Driven System ◽  
Microgravity Conditions ◽  
Kinetics Of

The kinetics of granular gases, including both freely cooling and steadily driven systems, is studied experimentally in quasi-two-dimensional cells. Under microgravity conditions achieved inside an aircraft flying parabolic trajectories, the frictional force is reduced. In both the freely cooling and steadily driven systems, we confirm that the velocity distribution function has the form exp(−α|v|β). The value of exponent β is close to 1.5 for the driven system in a highly excited case, which is consistent with theory derived under the assumption of the existence of the white-noise thermostat (van Noije & Ernst, Gran. Mat., vol. 1, 1998, p. 5764). In the freely cooling system, the value of β evolves from 1.5 to 1 as the cooling proceeds, and the system's energy decays algebraically (Tg = T0(1 + t/τ)−2), agreeing with Haff's law (Haff, J. Fluid Mech., vol. 134, 1983, p. 401430).

Hydrothermal waves on ethanol droplets evaporating under terrestrial and reduced gravity levels

2012 ◽  
Vol 712 ◽  
pp. 614-623 ◽  
Author(s):  
F. Carle ◽  
B. Sobac ◽  
D. Brutin
Keyword(s):  
Experimental Study ◽  
Normal Gravity ◽  
Scaling Law ◽  
Gravity Level ◽  
Reduced Gravity ◽  
Microgravity Conditions ◽  
Evaporation Dynamics ◽  
Good Agreement

AbstractThis experimental study, performed under microgravity conditions, focuses on the evaporation dynamics of ethanol drops and the formation and behaviour of the hydrothermal waves that spontaneously develop on the drop surfaces. The aim of this study is to compare our results to a similar study performed under normal gravity conditions to confirm the purely thermocapillary origin of these instabilities. A scaling law predicts with good agreement the number of instabilities that form, regardless of the gravity level.

An experimental study on flame propagation in lean fuel droplet-vapor-air mixtures by using microgravity conditions

1998 ◽  
Vol 27 (2) ◽  
pp. 2667-2674 ◽  
Author(s):  
Hiroshi Nomura ◽  
Kazuhira Izawa ◽  
Yasushige Ujiie ◽  
Jun'ichi Sato ◽  
Youichi Marutani ◽  
...  
Keyword(s):  
Experimental Study ◽  
Flame Propagation ◽  
Fuel Droplet ◽  
Microgravity Conditions ◽  
Lean Fuel

scholarly journals Microgravity Expulsion of PTFE Spheres from Water: An Experimental Study

2019 ◽  
Vol 1 (2) ◽  
pp. 27-33
Author(s):  
Ashlan Ahmed ◽  
Rayhan Ahmed
Keyword(s):  
Experimental Study ◽  
Contact Angle ◽  
Butyl Rubber ◽  
Drop Tower ◽  
Base Case ◽  
Microgravity Conditions ◽  
Rubber Coating ◽  
New Research ◽  
Experimental Runs ◽  
Test Objects

This paper presents the hypothesis and experimental results of expulsion of spheres that are made up of polytetrafluoroethylene (PTFE), also known as Teflon, and Teflon spheres layered with superhydrophobic substances, from water under microgravity conditions. The microgravity was simulated in a drop tower. The microgravity tests were conducted in the 2.2 Second Drop Tower at the NASA Glenn Research Center in Cleveland, Ohio. The experimental test objects chosen were: a) the unmodified PTFE sphere to serve as the base case (30 mm diameter); b) a PTFE sphere of same diameter layered with butyl rubber (25 mm of PTFE and 5 mm of butyl rubber); and c) a PTFE sphere of same diameter layered with paraffin (25 mm of PTFE and 5 mm of Paraffin). We hypothesized that the PTFE sphere with a butyl rubber coating would rise the highest distance in the drop chamber due to its super-hydrophobicity as determined by the contact angle of the objects. We tested the effect of microgravity on fully submerged and partially submerged objects in water. The expulsion data from our experimental runs in both fully and partially submerged protocols is presented, as well as our analysis and recommendations. Our test resulted in measurable reduction of the hydrophobicity effect while exposed to microgravity. We propose new research regarding a compounding effect of hydrophobicity based on surface properties and roughness of substances

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