...). The overall objectives of the long-term NASA project are to: (a) obtain flow boiling and condensation databases in microgravity, (b) develop an experimentally validated, mechanistic model for flow boiling critical heat flux (CHF) in microgravity and criteria to predict the minimum flow rate required to ensure...

...Rishi Raj; Jungho Kim; John McQuillen The relatively poor understanding of gravity effects on pool boiling heat transfer can be attributed to the lack of long duration high-quality microgravity data, g-jitter associated with ground-based low gravity facilities, little data at intermediate gravity...

...Hiroshi Kawamura; Koichi Nishino; Satoshi Matsumoto; Ichiro Ueno This paper reports some important results obtained from a series of microgravity experiments on the Marangoni convection that takes place in liquid bridges. This project, called Marangoni Experiment in Space (MEIS), started from...

..., in agreement with Eq. 3 , where g is contained inside the capillary length. Vapor bubbles do detach quite easily in microgravity. An approach as in Eq. 3 implies that, since l L → ∞, in reduced gravity, no detachment (or only detachment at very large diameter) could take place. It is, however...

.... The edges formed between the wires and the plates provide the working fluid capillary pressure necessary to overcome all the pressure losses. Two different experimental set ups were developed: one for test in gravity (laboratory) and other for microgravity conditions (International Space Station—ISS...

...Rishi Raj; Jungho Kim; John McQuillen Although the effects of microgravity, earth gravity, and hypergravity ( > 1.5 g ) on pool boiling heat flux have been studied previously, pool boiling heat flux data over a continuous range of gravity levels (0–1.7 g) was unavailable until recently...

... limiting flame length microgravity Flame spread over a solid surface in concurrent flows has two limiting cases: upward spread in a buoyant flow in a gravitational field and downstream forced flow spread in zero gravity in a ventilated cabin. For thick solids, the conventional notion of upward...

... 25 06 2009 boiling bubbles capillarity convection nucleation organic compounds surface tension zero gravity experiments boiling variable gravity microgravity thermocapillary convection dissolved gas heater size Pool boiling involves complicated nonlinear processes...

... in mini- and microchannels during hyper- and microgravity. The experimental activities are performed in the frame of the MAP Boiling project founded by ESA. Analysis using inverse methods allows us to estimate local flow boiling heat transfers in the minichannels. To observe the influence of gravity level...

... boiling CHF. Only one of the three criteria is dominant for a given gravitational field. This methodology may help reduce electric power consumption in space thermal management systems, provided it is ultimately validated for other coolants, especially in microgravity. This study examined...

...Amit Kumar; Kevin Tolejko; James S. T'ien A detailed, two-dimensional, laminar, flame spread model over a thin solid is solved in both a normal gravity downward spread configuration and in a microgravity quiescent atmosphere configuration. The radiation transfer equation is solved using discrete...

... (∼1% air saturation) for animal cells 1 . Thus, a constant oxygen consumption rate is a reasonable model for the present purposes. Forced Convection Mass Transfer Microgravity Spheres Unsteady two-phase flow mass transfer boundary layers flow instability 10 Mass...

... received September 20, 2002. Associate Editor: G. P. Peterson. 10 December 2001 20 September 2002 29 01 2003 convection capillarity cooling contact angle phase transformations confined flow two-phase flow Heat Transfer Microgravity Natural Convection Surface Tension...

... be used to cancel or overcome gravitational force. Enhancement Heat Transfer Magnetic Microgravity Natural Convection convection gravity pipe flow heat conduction superconducting magnets 24 September 2001 20 March 2002 16 07 2002 Contributed by the Heat...

... proportional to the Stefan number also becomes more pronounced under the zero gravity condition. The trend of average and local Nusselt number of the melting packed bed under microgravity, as a function of Reynolds number and Prandtl number, is discussed and compared with the case of nonmelting packed bed...

... growth from melt thermal conductivity anisotropic media forced convection solidification shrinkage deformation temperature distribution heat conduction interface phenomena melting viscosity optical materials nonlinear optics heating impurities Crystal Growth Microgravity...

.... Condensation Heat Transfer Microgravity Microscale Phase Change 07 July 1998 01 June 1999 05 12 2007 E. Begg D. Khrustalev1 A. Faghri Mem. ASME Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269 Complete Condensation of Forced Convection Two-Phase Flow...

... , “ Pool Boiling of a Non-azeotropic Binary Mixture under Microgravity ,” International Journal of Heat and Mass Transfer , Vol. 37 , No. 16 , pp. 2405 – 2413 . Lee H. S. , Merte H. , and Chiaramonte F. , 1997 , “ Pool Boiling Curve in Micro-gravity ,” Journal of Thermophysics...

... flow speeds due to insufficient gas residence time. A flammability map was constructed showing the existence of maximum Φ above which the solid is not flammable at any freestream velocity. 06 Oct 1997 30 Mar 1998 05 12 2007 Combustion Cylinder Flame Heat Transfer Microgravity...

... 1997 13 Mar 1998 05 12 2007 Heat Transfer Microgravity Thermocapillary Canright D. , 1994 , “ Thermocapillary Flow Near a Cold Wall ,” Physics of Fluids , Vol. 6 , No. 4 , pp. 1415 – 1424 . Chun C.-H. , and Wuest W. , 1979 , “ Experiments...