User:Tohline/ThreeDimensionalConfigurations/BinaryFission

Fission Hypothesis of Binary Star Formation

Qualitative Illustration

Figure 1 YouTube video: Skylab Drop Dynamics Experiment (1975)	Figure 2 Wang, Anilkumar, Lee & Lin (1994) (Journal of Fluid Mechanics, 276, 389)
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 (circa 1992): Experiments illustrating the dynamical behavior of liquid drops were evidently also conducted during a couple of space shuttle missions. 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.
  • 

    USML-1 Droplet Fission
    The first 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)

© 2014 - 2021 by Joel E. Tohline |   H_Book Home   |   YouTube   | Appendices: | Equations | Variables | References | Ramblings | Images | myphys.lsu | ADS | Recommended citation:   Tohline, Joel E. (2021), The Structure, Stability, & Dynamics of Self-Gravitating Fluids, a (MediaWiki-based) Vistrails.org publication, https://www.vistrails.org/index.php/User:Tohline/citation