High precision flow cell accelerometer for measuring quasi-steady microgravity accelerations

Naumann, Robert J.; Haulenbeek, Glen

doi:10.1063/1.1302546

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…A theoretical description of this instrument was given in [63]. At approximately the same time, a convection experiment on water was carried out onboard the "Space Shuttle" [64]. In that paper (which contains no references to the experiments on a gaseous medium in which this principle was previously proposed and justified theoretically [62,63]), a "novel" microacceleration measuring principle was advanced.…”

Section: Features Of Convection and Heat And Mass Transfer Under Realmentioning

confidence: 99%

“…In that paper (which contains no references to the experiments on a gaseous medium in which this principle was previously proposed and justified theoretically [62,63]), a "novel" microacceleration measuring principle was advanced. The mathematical modeling of convection under conditions corresponding to [64] performed in [34] shows that this instrument has a significant time lag, which makes it difficult to use it as a microacceleration indicator.…”

Section: Features Of Convection and Heat And Mass Transfer Under Realmentioning

confidence: 99%

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Convection and heat/mass transfer processes under space flight conditions

Polezhaev¹

2006

Fluid Dyn

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A simulation of 3D convective flows and heat/mass transfer processes under space flight conditions on the basis of hydrodynamic models and a numerical analysis of these models is discussed. The significance of the methods of mechanics in microgravity sciences and the role of the journal "Fluid Dynamics" in the development of this branch of science is examined. The results of recent investigations of certain problems are presented. 3 The title seems to be not quite appropriate since it contains a keyword referring to the notion of "microstructure", which has a different meaning.

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Section: Features Of Convection and Heat And Mass Transfer Under Realmentioning

confidence: 99%

Section: Features Of Convection and Heat And Mass Transfer Under Realmentioning

confidence: 99%

Convection and heat/mass transfer processes under space flight conditions

Polezhaev¹

2006

Fluid Dyn

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Transport from Higher Order g‐Jitter Effects

Naumann¹

2002

Annals of the New York Academy of Sciences

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Large complex spacecraft, such as the International Space Station (ISS), will have a rich spectrum of vibrational modes that will be excited by crew activity as well as by on-board mechanical systems. The response of various experiments to this vibratory environment is not completely understood and has been a subject of concern to the users community. Since these vibrations arise for the most part from internal forces, the net acceleration must time-average to zero. Steady state periodic accelerations applied to a fluid in a completely filled container with an imposed density gradient will drive first-order flows that time-average to zero. Likewise, the resulting first-order thermal and solutal fluctuations time-average to zero. Over the range of frequencies in the vibrational environment expected on the ISS, the velocity oscillations tend to be nearly 90 degrees out of phase with the thermal and/or solutal fluctuations; consequently, little net transport occurs from the first-order effects. We must, therefore, examine possible higher-order effects that can lead to significant net transport. Second-order flows with non-zero time averages arise from the non-linear terms in the flow equations and from incomplete cancellation of first-order flows if the density gradient changes with time, or if the periodic acceleration has both axial and transverse components relative to the imposed density gradient. The time-average of such flows can be expressed in terms of the sum of the square of each periodic acceleration, weighted by the appropriate function of the frequency, taken over all frequencies; or as the weighted integral over the power spectral distribution (PSD) of the frequency spectrum. Approximate analytical solutions for these second-order flows, which agree closely with numerical computations, have been found using a perturbation analysis. These analytical models are then used to predict the effects of the anticipated vibratory environment on various classes of experiments planned for the ISS. Even though these second-order flows are much smaller than the first-order flows, it is shown that they can produce significant transport.

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High precision flow cell accelerometer for measuring quasi-steady microgravity accelerations

Cited by 2 publications

References 4 publications

Convection and heat/mass transfer processes under space flight conditions

Convection and heat/mass transfer processes under space flight conditions

Transport from Higher Order g‐Jitter Effects

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