File:Microgravity Burning.jpg

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Summary

DescriptionMicrogravity Burning.jpg	English: (This is an artificially symmetrized photograph i.e. a mirror image of itself and should not be mistaken for a real image.) Because of the absence of gravity, fuels burning in space behave very differently from how they do on Earth. In this image, a 3-millimeter diameter droplet of heptane fuel burns in microgravity, producing soot. When a bright, uniform back-light is placed behind the droplet and flame and recorded by a video camera, the soot appears as a dark cloud. Image processing techniques can then quantify the soot concentration at each point in the image. On the International Space Station, the NASA Flame Extinguishment Experiment (FLEX) examines the combustion of such liquid fuel droplets. This colorized gray-scale image is an artificially symmetrized composite of the individual video frames of the back-lit fuel droplet. The bright yellow structure in the middle is the path of the droplet, which becomes smaller as it burns. Initial soot structures (in green) tend to form near the liquid fuel. These come together into larger and larger particles which ultimately spiral out of the flame zone in long, twisting streamers.
Date	25 May 2011
Source	NASA Image of the Day
Author	NASA
Other versions	The colorized image was constructed from the droplet back-lit view of Test 23 of the NASA FLEX experiment (see video).NASA FLEX Test 23 3mm droplet of heptane burning in microgravity as part of the FLEX experiment conducted inside the Combustion Integrated Rack on the International Space Station. Atmosphere is 33.4% oxygen (balance nitrogen) at a pressure of 0.713 atm. This back-lit view shows the droplet as it burns as well as small particles of soot which coalesce. The flame itself is generally not visible.

Licensing

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	14:23, 25 May 2011		2,140 × 1,605 (430 KB)	Originalwana	{{Information \|Description ={{en\|1=Because of the absence of gravity, fuels burning in space behave very differently than they do on Earth. In this image, a 3-millimetre diameter droplet of heptane fuel burns in microgravity, producing soot

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Combustion

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