For my fluid project, I have to test our model on gas flows, besides water waves. I first started searching at flickr, and it turned out that I was right. There are hundreds of image about smoke, they are really amazing and pieces of art. Then I began to think about how to capture these smoke images. I had a rough idea but still didn’t know how to start, and what equipments do I need. Finally, I found this article. It not only teaches you how to set up the environment, but also offers some techniques to process the raw images in photoshop.

Smoke Photography
Capturing Delicate Wisps of Smoke
Written by Steve Paxton
http://paxtonprints.com/index.php?x=smoke