Revision as of 00:02, 4 January 2014

Fission Hypothesis of Binary Star Formation

Illustration

Figure 1 YouTube video: Skylab Drop Dynamics Experiment (1975)	Figure 2 Brown & Scriven (1980) (Journal of Fluid Mechanics, 276, 389)	Figure 4 Wang, Anilkumar, Lee & Lin (1994) (Proc. Roy. Soc. London, 371, 331)
Figure 3 Hachisu & Eriguchi (1984) (Astrophysics and Space Science, 99, 71)

Related Discussions

Fission in Nuclear Physics

The nuclear physics community also draws an analogy between the fission of a rotating fluid drop and the spontaneous fission of atomic nuclei; see, for example, the figure associated with the Wikipedia discussion of the energetics of nuclear fission.

Drop Dynamics Experiments

[On 1 January 2014, J. E. Tohline wrote ...] As I was putting this chapter together, I had difficulty documenting the various drop dynamics experiments that have been conducted by astronauts in various Earth-orbiting (zero <math>g</math>) environments. Here is the relevant information that I have found, to date:

Skylab (circa 1973-1974): Experiments showing the fission of liquid drops were evidently conducted during the Skylab 2, Skylab 3, and Skylab 4 missions.
- As has been documented in a short film review written by Howard Voss and published in the American Journal of Physics (44/10, 1021, Oct 1976), film footage from a variety of Skylab experiments was produced by NASA, edited by Thomas Campbell & Robert Fuller, and, beginning in 1976, distributed as 12 Super 8 film loops by the American Association of Physics Teachers (AAPT).
- As is documented in A Teacher's Guide for the Skylab Physics Videodisc the content of all 12 Super 8 film loops was made available for distribution in Videodisc format in 1987 through the AAPT.
- The YouTube video referenced in and linked to the caption of Figure 1, above, is the digitized version of the Skylab film loop that illustrates fission of a water droplet.

According to the Teacher's Guide mentioned above, the activities shown in the above-referenced films were carried out by three teams of Skylab Astronauts:

Kerwin blows water droplet from a straw

Skylab 2 (First Team)

Space Shuttle Flights: Experiments illustrating the dynamical behavior of liquid drops were also conducted during several space shuttle missions. Some experiments were performed inside the European Space Agency's "spacelab module" and others were performed with the aid of a "Drop Physics Module (DPM)" inside the United States Microgravity Laboratory (USML), each being a "portable" laboratory that was housed in the shuttle's payload bay.
- Wang, Trinh, Croonquist, and Elleman (1986; Physical Review Letters, 56, 452) report results from a controlled drop dynamics experiment that was conducted during the "Spacelab III mission" (see the final acknowledgement paragraph of their paper), which took place during shuttle flight STS-51-B (29 April - 6 May 1985). Taylor Wang — one of the authors of this PRL publication — flew as one of the seven members of the space shuttle crew, specifically as Payload Specialist 2.
- USML-1 Droplet Fission
  Another mission — USML-1 during shuttle flight STS-50 — took place in early 1992. According to information provided by NASA/JPL's public information office, "… the transition of rotating liquid drops into a 'dog-bone,' or two-lobed shape, was studied in detail …" Detailed results from DPM experiments during the USML-1 mission have been published in the Journal of Fluid Mechanics: T. G. Wang, A. V. Anilkumar, C. P. Lee and K. C. Lin (1994). Bifurcation of rotating liquid drops: results from USML-1 experiments in Space. Journal of Fluid Mechanics, 276, pp 389-403
- I think that the three-frame black & white image shown here on the right presents a result from mission USML-1. That is how this image is referenced in an online discussion of fission that I put together about a decade ago.
- The second mission — USML-2 during shuttle flight STS-73 — took place in the fall of 1995. It does not appear as though the fission of liquid drops was an element of these USML-2 DPM experiments.

International Space Station (circa 2000):
- See the two "Gallery of Fluid Motions" mpg movies that accompany the preprint by Ueno et al. (2012).

Online References

The Fission Mechanism for Binary Star Formation
Fission Simulations at LSU
T. G. Wang, A. V. Anilkumar, C. P. Lee and K. C. Lin (1994). Bifurcation of rotating liquid drops: results from USML-1 experiments in Space. Journal of Fluid Mechanics, 276, pp 389-403
Ohsaka & Trinh (19xx)

@@ Line 81: / Line 81: @@
 </div>
-* '''<font color="darkblue">Space Shuttle Flights</font>''':  Experiments illustrating the dynamical behavior of liquid drops were also conducted during several space shuttle missions.  At least some of the experiments were performed with the aid of a "Drop Physics Module (DPM)" inside the "portable" United States Microgravity Laboratory (USML) that was housed in the shuttle's payload bay.
+* '''<font color="darkblue">Space Shuttle Flights</font>''':  Experiments illustrating the dynamical behavior of liquid drops were also conducted during several space shuttle missions.  Some experiments were performed inside the European Space Agency's "spacelab module" and others were performed with the aid of a "Drop Physics Module (DPM)" inside the United States Microgravity Laboratory (USML), each being a "portable" laboratory that was housed in the shuttle's payload bay.
 ** [[File:Sts51b_patch.jpg|100px|right|Spacelab 3]]Wang, Trinh, Croonquist, and Elleman (1986; [http://adsabs.harvard.edu/abs/1986PhRvL..56..452W Physical Review Letters, 56, 452]) report results from a controlled drop dynamics experiment that was conducted during the "Spacelab III mission" (see the final acknowledgement paragraph of their paper), which took place during shuttle flight [http://en.wikipedia.org/wiki/STS-51-B STS-51-B (29 April - 6 May 1985)].  Taylor Wang &#8212; one of the authors of this ''PRL'' publication &#8212; flew as one of the seven members of the space shuttle crew, specifically as Payload Specialist 2.
 ** [[File:fluid_drop.jpg|100px|right|frame|USML-1 Droplet Fission]]Another mission &#8212; [http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/archives/sts-50.html USML-1 during shuttle flight STS-50] &#8212; took place in early 1992. According to [http://www.jpl.nasa.gov/releases/95/release_1995_9571.html information provided by NASA/JPL's public information office], "&#8230; the transition of rotating liquid drops into a 'dog-bone,' or two-lobed shape, was studied in detail &#8230;"  Detailed results from DPM experiments during the USML-1 mission have been published in the Journal of Fluid Mechanics:  T. G. Wang, A. V. Anilkumar, C. P. Lee and K. C. Lin (1994).  ''Bifurcation of rotating liquid drops: results from USML-1 experiments in Space.'' [http://dx.doi.org/10.1017/S0022112094002612 Journal of Fluid Mechanics, 276, pp 389-403]

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