JSC (AV) - Skylab 4 - Liquid Floating Zone - TV 101 Part 5

Description

FR #A232 SKYLAB 4 KINESCOPE TAPE 12, PART 3 of 3 Okay, this time around let's try something different. Rather than turning to used colors to follow the flow, we're going to use very small inclusions in the water which you see in the fluid on the right. They are little small pieces of rope which have been sheared off and I think they are probably just about large enough so that you can follow them. There she is, pretty much just at a fluid motion, perpendicular to the radius as well as along it. The column is forced to compress, it moves outward, and comes back inward. Now we'll see something different when we get a little bit larger compression. See, I nip circulation and in this case, it was tending to come from the right and the front and return on the opposite side. Now this one sets up a motion with a fluid where the fluid will move on the outside of the column from the right to the left and we turn return up the center. We can easily reverse that - okay, enough of vibrations now let's follow the fluid motion by watching the particles in there. Again, those are just small pieces of the end of a frayed rope which have been cut off and put in the fluid and they work pretty well. They do not accumulate - they are relatively light, they don't have much inertia, so they tend to follow the fluid, and I can see them on my TV monitor which is a relatively lower resolution than what you are watching it with, so I'm confident they should show up pretty well there also. Okay, now again, we'll go with a slow rotation with both rods in the same direction okay, let's hold up, let it damp out, and then we'll move in to a little faster rotation. Now from that you can get a good feel for just what are the damping times in water under zero gravity conditions with column rotating like that with the ends fixed. Okay, here we go again. Real quickly into our "Sausage Stability" (?) instability. Can't help - slow it down a little bit here. Okay. Now let's see if we can get that fellow lined up along the axis they should show up pretty well there also. Okay now, then we'll go in a slow rotation now we're looking at another kind of soap solution, unlike the last one. This one is much lower density, mostly water and air - about 50% or so of each, and we'll zoom in here and take a look at the oscillation properties. First of all, the one bubble by itself. And if you notice, it tends to respond a little more rapidly than the other solution does, even though the previous solution we had with no air bubbles A232 even though the surface tension is down, the density is likewise down, and there's a compensating effect. Okay, now we're gonna' move the two together. We have one on the left with a slightly different color so we can follow the mixing. These types of materials are interesting, but I think in the future may be quite useful for building metals which are exceptionally strong but very light. We already have seen that in centered metals, zero-G looks like a perfect place to put these together. Now they'll come together very relatively slowly and you'll notice the lack of mixing. There's not much inertia involved where the two columns came together. And the viscosity of this kind of mixture I could only guess at. Now what seems in order here is a counter rotation (garble) now, in the one on the left, it's swinging around, you can see the end which is furthermost from the axis has got a lot of water accumulated on the bottom, which is just as we've seen before in the other soap solution or the other solution in which we had bubbles, the bubbles always tended to go tward the axis rotation, here likewise, the water, which is most evident, goes toward the opposite direction. Centrifugal force takes the place of gravity. Now we'll start this off relatively slowly. Now we do have a density asymmetry there in that the axis or the water which was furthermost from the axis has probably remained that way. It's a little more stable though - we don't have inertia involved, and I think the viscosity must have an effect in it, but I could not at this time hazard a guess. We could build ourselves up quite a mushroom there. Let's see how this behaves relative to the others. Can we knock it over there? Sure well now, that's interesting - those surfaces when they meet do not combine. There was not enough inertia behind it or the surface properties were such that could be that they dried out a little bit again, I can only guess at this time on that one. Okay now, we're gonna' rotate again only this time just on the left. Wrap ourselves up very easily, get a mushroom, which gradually becomes divergent. All you need is a little asymmetry and it diverges. Okay, let's do one other thing. As soon as we can get our friend here to stop rotating let me turn you back this way and slow you down a little, get the axis lined up. Okay, now let's just see what we can do in the way of rotation - excuse me, of vibration along the axis. Still some of the same phenomenon but a little bit more lethargic. There we've got two types of oscillations going - one in the up-down direction, as you see it, and one laterally, as I see it set up standing waves, if it's done carefully. Standing waves pattern ought to stand out, ought to be shown by the location of the very Page 3 A232 fine bubbles well, there's a new kind of oscillation. Okay, that concludes our story of floating zones and bubbles.

Collection

Records of the National Aeronautics and Space Administration

Series

Moving Images Relating to Documentary Stock Footage