The present work is about a very low-cost Schlieren setup for compressible flow visualization especially high-speed jets. The conventional Schlieren setups employ knife-edge for chopping of rays. The specialty of the setup is that it does not employ a knife-edge for chopping off the deflected rays. The chopping off is achieved by a lens of the DSLR camera used for recording the images resulting from Schlieren Visualization process. The flow field of a supersonic jet from a convergent nozzle is used to check the visualization outcomes. The method is found to be cost effective and yields best results for jet flow visualization. The present method can be employed by students and research scholars for their research studies.

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The present paper is about Kelvin-Helmholtz instability and its visualization using laser-based techniques. The smoke is produced by burning an incense material which acts as a tracer. The flow field is illuminated by a pointer laser by making a laser sheet for recording the image. The images were recorded using a digital mobile camera and were used for further assessment. The flow field shows the evolution of plume from the paper cup, the formation of Kelvin-Helmholtz vortices, and its transition to turbulent flows.