Magnetic compensation of gravity forces in liquid/gas mixtures: surpassing intrinsic limitations of a superconducting magnet by using ferromagnetic inserts

Quettier, L.; Félice, H.; Mailfert, A.; Chatain, D.; Beysens, Daniel

doi:10.1051/epjap:2005074

Cited by 34 publications

(30 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was uniform within 1.5% of the Earth's acceleration constant in a sample cell of 3 mm diameter and 3 mm thickness. Note that it can be shown that a perfect uniform compensation cannot be strictly achieved according to Maxwell's laws [2]). …”

Section: Resultsmentioning

confidence: 99%

Vibrations in space as an artificial gravity?

Beysens

2006

Europhysics News

View full text Add to dashboard Cite

T he environment for satellites and spacecraft in space is markedly different from the terrestrial situation. Apart from the high vacuum, low temperature and intense external radiation environment, gravitational effects are absent. A wide variety of fundamental processes involving fluids and living systems are drastically affected; one of the major reasons being the absence of buoyancy flows (Fig. 1) One way to improve the management of fluids and that of life support systems would be to create an "artificial" gravity. Classically, an artificial gravity can be produced in space in two ways. A centrifugal force, created by spinning the spacecraft or space station, can be used. However, large Coriolis forces are also present and everything would fall in curves instead of straight lines. One can also linearly accelerate the spaceships, but this cannot be continued over long periods because of the enormous energy costs. Less known would be the possibility to produce a uniform force field as coming from a magnetic field gradient, but here also the cost in energy is very high. (However, this solution can be advantageously used to compensate gravity on Earth as described below, see Box above fig. 4). Fluids and vibrationsIf we narrow our focus to fluid systems and to some extent to living organisms, vibrations provide another possible means of reproducing some of the effects of gravity. First of all, large amplitude (with respect to the system size), low frequency (with respect to the system time response) vibration gives a periodic acceleration -and then a periodic artificial gravity -to any entity. In order to illustrate this fact by an example, Fig. 2a shows a sample of supercritical fluid CO2 heated on Earth by a point source (a thermistor). It results in the convection of the less dense hot fluid parallel to gravity and an accumulation of hot fluid at the top, with a hot-cold interface perpendicular to gravity. The same phenomenon in space conditions and under vibration gives a similar convection pattern that is symmetrical with respect to the direction of vibration (Fig.2b).At small amplitude and high frequency, the situation is more complex and, at the same time, more interesting. In addition to local vibrations of the fluid, average flows are created. These flows are of inertial origin; they are connected to the nonlinear response of the fluid to the vibration and are initiated because of the existence of density inhomogeneities ∆ρ. Average flows can also originate in the viscous hydrodynamic boundary layers at the cell walls or inclusions from where they propagate to the whole sample.When submitted to a simple harmonic linear vibration X = acosωt, a density inhomogeneity ∆ρ in a fluid of mean density ρ can thus acquire a velocity difference ∆V = (∆ρ/ρ)aω. Contrary to the effect of vibrations of large amplitude and low frequency that direct inhomogeneities parallel to the direction of vibration, the low amplitude and high frequency vibration induces, in general, mean flows perpendicular to the vibration directi...

show abstract

Section: Resultsmentioning

confidence: 99%

Vibrations in space as an artificial gravity?

Beysens

2006

Europhysics News

View full text Add to dashboard Cite

show abstract

“…Their mirrors can rotate to adjust the view angle. It has been shown (Quettier et al 2005) that it is not possible to exactly compensate the gravity in a finite volume. It can be compensated in only one point in the present installation.…”

Section: Presentation Of the Facilitymentioning

confidence: 99%

Magnetic Compensation of Gravity: Experiments with Oxygen

Pichavant

Cariteau

Chatain

et al. 2008

Microgravity Sci. Technol

Self Cite

View full text Add to dashboard Cite

The CEA Grenoble, through the ESEME/ SBT team, has developed a new ground based facility providing magnetic compensation of gravity in oxygen. A 2T superconducting magnetic coil has been used to create the magnetic field. The installation is described. Well adapted to the heat and mass transfer studies, for example of the various boiling regimes, it permits to enhance the understanding of these phenomena in reduced gravity and gives a convenient way to reproduce space conditions on the ground. The first experimental results are presented.

show abstract

“…It was established (Quettier 2003;Quettier et al 2005) that it is impossible to perfectly compensate the weightiness in all points of the cylindrical working zone using only magnetic means. The Fig.…”

Section: Association Of Magnetic and Centrifugal Forces In Creating Pmentioning

confidence: 99%

“…Theoretical and experimental studies of magnetic compensation of gravity have been made specifically on liquid or diphasic hydrogen (Wunenberg et al 2000;Quettier et al 2005). This paper deals with the new possibilities offered by the combination of magnetic, gravitational and centrifugal forces on paramagnetic fluids like oxygen or diamagnetic ones like water and hydrogen.…”

mentioning

confidence: 99%

Magnetic Compensation of Gravity and Centrifugal Forces

Lorin¹,

Mailfert²

2008

Microgravity Sci. Technol

Self Cite

View full text Add to dashboard Cite

This paper deals with the theoretical combination of magnetic forces, centrifugal forces, and gravity acting on low-χ magnetic fluids contained within a cylindrical shaped zone with a horizontal axis. The magnetic field is created by a combination of both quadrupolar winding and dipolar fields, as exists in superconducting coils developed for particle accelerators. Such a ground based device, if static, simulates a rotation -in space conditions -of a paramagnetic substance such as liquid oxygen. When the cylinder rotates, it creates exact gravity compensation -on Earth -for diamagnetic fluids such as hydrogen. These results go beyond a previous result that found it impossible to reach perfect magnetic compensation of gravity in a 3D domain.

show abstract

Magnetic compensation of gravity forces in liquid/gas mixtures: surpassing intrinsic limitations of a superconducting magnet by using ferromagnetic inserts

Cited by 34 publications

References 5 publications

Vibrations in space as an artificial gravity?

Vibrations in space as an artificial gravity?

Magnetic Compensation of Gravity: Experiments with Oxygen

Magnetic Compensation of Gravity and Centrifugal Forces

Contact Info

Product

Resources

About