Micro-gravity

Zhao and Rezkallah (1993), Rezkallah (1996), and more recently Lowe and Rezkallah (1999) developed two-phase flow transition models for micro-gravity channel flows based on liquid and gas Weber numbers. Zhao and Rezkallah (1993) suggested Wees 1 as the upper boundary for the surface tension-dominated zone, and Wees 20 as the lower boundary for the inertia-dominated zone. 

J. Lee, S. H. Won, S. H. Jin, S. H. Chung, O. Fujita, and K. Ito, Propagation speed of tribrachial (triple) flame of propane in laminar jets under normal and micro gravity conditions. Combust. Flame 134 411M20,2003. 

Long Jr, R.T., An evaluation of the lateral ignition and flame spread test for material flammability assessment for micro-gravity environments, MS Thesis, Department of Fire Protection Engineering, University of Maryland, College Park, Maryland, 1998. 

Medicinal products, the manufacture of which employs processes which, in the opinion of the EMEA, demonstrate a significant technical advance such as two-dimensional electrophoresis under micro-gravity... 

Until recently, however, investigators were unable to determine directly whether gravity was required for lignification because a zero or micro gravity was not available for an extended period of time. This has changed... 

Consider condensate forming on a cold tube of radius, R, in a micro-gravity environment. In such an environment, the condensate will not run off the tube. Assuming that the heat transfer is by quasi-steady conduction show that the film radius as a function of time, r, is given by ... 

E.N. Coker, J.C. Jansen, J.A. Martens, RA. Jacobs, F. DiRenzo, F. Fajula, and A. Sacco, The Synthesis of Zeolites under Micro-gravity Conditions A Review. Micmpomus Mesoporous... 

Figure 7. Schematic of light-scattering devices under micro-gravity conditions a) PROGRA with moveable arm around the dust sample enclosed in a glass vial b) CODAG, with a ring of detectors around the dust, enclosed in a low-pressure chamber where agglomeration takes place.

Agble, D., and Mendes-Tatsis, M. A. (1997). Surfactant Induced Marangoni Convection under Micro-gravity. In Proceedings of Joint Xth European and Vith Russian Symposium on Physical Sciences in Microgravity (St Petersburg, Russia), 108-117. 

Micro-gravity meters have been used to detect subsurface voids such as caverns in limestone, or abandoned mine shafts or shallow workings (Styles and Thomas, 2001). Gravity lows are recorded over voids, and they are more notable over air-filled than water- or sediment-filled voids. 

Chen Y, Evesque P, Hou M Breakdown of energy equipartition in vibro-fluidized granular media in micro-gravity. Chin Phys Lett 29 074501, 2012. 

Gravlee, M., Vera, C., Wollen, M., McLean, C., Walls, L., 2010. Micro-gravity cryogenic experiment opportunity. In AlAA-2010-8838, 2010 Space Conference, Anaheim, CA, August 30 September 2. 

As an example, we will consider the experimental data obtained in an oscillating bubble study performed under micro-gravity conditions on board the space shuttle Discovery in 1998 (13). The pressure change Ap (given in bits of the analogue-digital (AD) converter) due to harmonic oscillations of the bubble volume is shown in Figure 12.16. As can be seen, after a short time of about 3 oscillation periods a steady state of the oscillation is reached. 

Figure 12.16. Experimental data obtained from oscillating bubble studies performed under micro-gravity at 450 Hz with water at 15°C, where the different symbols correspond to three runs of the experiment...

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