From The NY Times: Schlieren Photograpy

Full post here.

“Schlieren is German for “streaks”; in this case it refers to regions of different densities in a gas or a liquid, which can be photographed as shadows using a special technique.”

Wikipedia entry here.  Dr. Gary Settles’ page at Penn State’s Gas Dynamics Lab.  A 4:00 minute presentation by Dr Settles’ on his work…lots of cool images:

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