The microgravity environment: its prediction, measurement, and importance to materials processing

Matisak, B; Zhao, A. X.; Narayanan, R.; Fripp, A. L.

doi:10.1016/s0022-0248(96)01083-4

Cited by 11 publications

(5 citation statements)

References 2 publications

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“…seen as a modulation of the gravity which would reach , a reasonable value for experiments in space, specially taking into account that the convective velocity field was derived using an approximate solution of the 2D planar Navier-Stokes equations. In addition, it should be recalled at this point that the procedure leading to equation (21) is based on an order of magnitude analysis, meaning that the value can clearly be taken as reasonable.…”

Section: Fit Resultsmentioning

confidence: 99%

“…Mephisto was part of a larger material science effort, see e.g. [20,21] in the frame of the ambitious United States Microgravity Payloads (USMP) program that featured different campaigns in connection with flight opportunities between 1992 and 1997. Specifically regarding Mephisto, the data that will be discussed in the frame of the present paper are issued from two flights, namely USMP1 in 1992 and USMP3 in 1996, featuring tin bismuth alloys and where the Mephisto device was operated under CEA scientific leadership.…”

Section: The Mephisto Experimental Programmentioning

confidence: 99%

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An efficient 1D numerical model adapted to the study of transient convecto-diffusive heat and mass transfer in directional solidification

Tavernier

Millet

Henry

et al. 2017

International Journal of Heat and Mass Transfer

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International audienceWe combine an effective diffusivity model with a numerical approach initially proposed by Meyer (1981) to simulate transient heat and mass transfer phenomena in a directionally solidifying Sn-Bi rod. This particularly efficient 1D numerical model is light enough to be used within the frame of optimization methods at reasonable numerical cost. This approach is tested against reference in situ measurements obtained under microgravity conditions during the Mephisto program. We simulate the final homogenization transient of several experimental runs with different pulling velocities. The solid/liquid interface temperature evolution with time is extracted from the simulations and compared with that obtained by Seebeck in line measurements. After optimization of the model the observed discrepancy between the simulated and measured data is less than 1.5%. This validates both the proposed very efficient 1D numerical approach and the consistency of the set of thermophysical parameters values for dilute Sn-Bi alloys

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Section: Fit Resultsmentioning

confidence: 99%

Section: The Mephisto Experimental Programmentioning

confidence: 99%

An efficient 1D numerical model adapted to the study of transient convecto-diffusive heat and mass transfer in directional solidification

Tavernier

Millet

Henry

et al. 2017

International Journal of Heat and Mass Transfer

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“…Matisak [299]. The aim of this experiment was to study the influence of the steady-state acceleration, present during all Space Shuttle flights, on the grown crystal.…”

Section: Spaceflight Experiments On Inorganic Crystal Growthmentioning

confidence: 99%

Imaging techniques for mapping solution parameters, growth rate, and surface features during the growth of crystals from solution

Verma

Shlichta

2008

Progress in Crystal Growth and Characterization of Materials

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“…In fluid systems, reduced gravity can significantly affect the sloshing dynamics of cryogenic propellants in spacecrafts 5 , the surface oscillation of liquid drops 6 , bubble cavitation 7 , and boiling heat transfer in fluids 8 , 9 . In material science, the potential of reduced gravity in growing tissues 10 and crystals 11 and for materials processing 12 has been recognized. Conducting systematic research to understand the mechanism of gravity in these diverse systems will undoubtedly advance our knowledge.…”

Section: Introductionmentioning

confidence: 99%

A magnetic levitation based low-gravity simulator with an unprecedented large functional volume

Sanavandi

Guo

2021

npj Microgravity

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Low-gravity environment can have a profound impact on the behaviors of biological systems, the dynamics of fluids, and the growth of materials. Systematic research on the effects of gravity is crucial for advancing our knowledge and for the success of space missions. Due to the high cost and the limitations in the payload size and mass in typical spaceflight missions, ground-based low-gravity simulators have become indispensable for preparing spaceflight experiments and for serving as stand-alone research platforms. Among various simulator systems, the magnetic levitation-based simulator (MLS) has received long-lasting interest due to its easily adjustable gravity and practically unlimited operation time. However, a recognized issue with MLSs is their highly non-uniform force field. For a solenoid MLS, the functional volume V1%, where the net force results in an acceleration <1% of the Earth’s gravity g, is typically a few microliters (μL) or less. In this work, we report an innovative MLS design that integrates a superconducting magnet with a gradient-field Maxwell coil. Through an optimization analysis, we show that an unprecedented V1% of over 4000 μL can be achieved in a compact coil with a diameter of 8 cm. We also discuss how such an MLS can be made using existing high-Tc-superconducting materials. When the current in this MLS is reduced to emulate the gravity on Mars (gM = 0.38g), a functional volume where the gravity varies within a few percent of gM can exceed 20,000 μL. Our design may break new ground for future low-gravity research.

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The microgravity environment: its prediction, measurement, and importance to materials processing

Cited by 11 publications

References 2 publications

An efficient 1D numerical model adapted to the study of transient convecto-diffusive heat and mass transfer in directional solidification

An efficient 1D numerical model adapted to the study of transient convecto-diffusive heat and mass transfer in directional solidification

Imaging techniques for mapping solution parameters, growth rate, and surface features during the growth of crystals from solution

A magnetic levitation based low-gravity simulator with an unprecedented large functional volume

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