... is a lack of reliable tools for accurate prediction of two-phase pressure drop and heat transfer coefficient in reduced gravity. Developing such tools will require a sophisticated experimental facility to enable investigators to perform both flow boiling and condensation experiments in microgravity...

...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...

... be seen that the heat transfer is relatively unaffected in the hypergravity phase preceding pull-up, while some residual and presumably transient effect is present during pull-out. In microgravity phase, the heat transfer is enhanced at tube inlet (Tw1 thermocouple) and degraded at exit (Tw10), while...

.... 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...

... at the pyrolysis front, appears to be correct for stationary nonspreading flames as we shall see from the result of this investigation, their application to steady spreading flames over thin solids may need to be modified. In microgravity, the forced flow in a spacecraft cabin can produce a concurrent flame...

... 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...

... than the heated length, L , the following Weber number criterion must be satisfied: (15) We = ρ f ρ g U 2 L ρ f + ρ g σ ⩾ 2 π . Boiling Channel Flow Heat Transfer Microgravity Phase Change two-phase flow boiling...

...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...

... Forced Convection Mass Transfer Microgravity Spheres Unsteady The physical problem motivating the present study is the unsteady transport of dissolved oxygen to freely suspended cell aggregates cultured in a bioreactor in the micro gravity environment of space. The anchorage dependent...

... 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...

... gravity pipe flow heat conduction superconducting magnets Enhancement Heat Transfer Magnetic Microgravity Natural Convection Through recent developments in super-conducting magnets strong magnetic-field gradients can be developed. These gradients can be used to produce large...

... 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...

... TRANSFER. Manuscript received by the Heat Transfer Division, July 7, 1998; revision received, June 1, 1999. Keywords: Condensation, Heat Transfer, Microgravity, Mi- croscale, Phase Change. Associate Technical Editor: P. Ayyaswamy. For miniature circular tubes the flow regime maps for conden- sation...

... systems incor- porating heat pipes or capillary-pumped loops, or the development of cryogenic storage and transport systems. In addition, future chemical and materials processing in microgravity environments may involve distillation or quenching, both of which employ gravity-dependent two-phase heat...

... 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. Combustion Cylinder Flame Heat Transfer Microgravity Bhattacharjee, S., and Altenkirch, R. A., 1990...

... 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...