The present study deals with the development and application of micron resolution rainbow schlieren deflectometry (μ-schlieren) apparatus to obtain whole field scalar measurements in micro-fluidic systems. The μ-schlieren system utilizes a 150 W halogen light source, achromatic lenses, and a CCD camera together with a camera lens, 2x lens-extender and extension tubes. The schlieren images obtained from the μ-schlieren system are analyzed using in-house post processing software to provide quantitative scalar measurements with spatial resolution down to 8 μm. The technique is first applied to measure the concentration field of a non-reacting helium-air jet with tube diameter of 1100 μm. Next, temperature measurements in a hydrogen jet diffusion flame from 30 μm diameter tube are presented to demonstrate the capability of the system in measuring reacting flows. The data presented in this study are the highest spatially resolved schlieren measurements published to date.

Pankaj Kolhe

Department of Mechanical and Aerospace Engineering

R.P. Satti

A.K. Agrawal

Indian Institute of Technology Hyderabad (IITH) is a premier institute of science and technology established in 2008. IITH has been consistently ranked in the&nbsp;<a href="https://iith.ac.in/reports/" rel="noopener noreferrer">top 10 institutes</a>&nbsp;in India for Engineering&nbsp;<a href="https://www.nirfindia.org/2021/EngineeringRanking.html" rel="noopener noreferrer" target="_blank">according to NIRF</a>&nbsp;making it one of the most coveted schools for science and technology in the country.

IITH offers&nbsp;<a href="https://iith.ac.in/academics/under-graduate/">undergraduate programs</a>&nbsp;in all the classical engineering disciplines, applied sciences, design, as well as several modern interdisciplinary areas. Students are given a flexibility to explore a broad set of areas, and potentially pursue a minor or double major in a discipline that is not their own. Students who wish to seek a deeper understanding of their own discipline are strongly encouraged to get involved in cutting-edge research with the help of a faculty to mentor them, and earn an Honors in their own field.

The very foundation of IIT Hyderabad is based on&nbsp;<a href="https://iith.ac.in/research/">research and innovation</a>. The vibrant research culture is evident from the number of patents and publications that IITH produces consistently every year. IITH offers&nbsp;<a href="https://iith.ac.in/academics/programmes-offered/">graduate programs</a>&nbsp;at both a masters, and a doctoral level, in several diverse areas. There are separate programs for technology, design, science, and liberal arts. The&nbsp;<a href="https://iith.ac.in/academics/post-graduate/">MTech program</a>&nbsp;is offered in various modes and durations to cater to the ever-growing need of postgraduate level professionals in the country.

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