Can we do Schlieren Photography using good mobile phone camera (13-20 MP)? If yes how or can we do this photography only using professional digital camera? Schlieren Photography
Yes, and you can even do schlieren photography using old and poor mobile phone camera.
It's not rocket science, yet it requires some equipment not normally found in a typical houshold (or even professional photographic studio), unless you are the amateur astronomer. The key ingredient is spherical mirror, which can be obtained from a cheap newtonian telescope (higher class amateur newtonians have parabolic mirrors, which is also acceptable). Then it is just the matter of arranging the mirror, camera, and a light source in a configuration similar to this:
(substitute the eye with a camera, and the light source can be used directly, no need for the second diagonal mirror - I'm just pasting the existing Wikipedia illustration on the Focault knife-edge test to avoid licensing issues, feel free to replace it with a better picture)