Dr. Sivadas V. comes to Amrita with national and international experience and reputation. He received his Ph. D. from IIT Bombay, specializing in Transverse Turbulent Jets utilizing optical diagnostic techniques. He was a Council of Scientific and Industrial Research (CSIR) Fellow while at IIT. 

In 1991, he worked as a German Academic Exchange Service (DAAD) Fellow at the German Aerospace Research Establishment (DLR)-Gottingen. This was followed by a Portuguese Science and Technology Fellowship in 2000 in the area of sprays and liquid film disintegration at the Insituto Superior Technico (IST) in Lisbon, Portugal under the European Commission DIME (Dynamics of Institution and Markets in Europe) program. The project focused on direct injection spray engine processes and mechanisms to improve performance. As part of this project, he participated in a short-course on the latest advances in Spray Technology at Carnegie Mellon University, USA under Professor Norman Chigier. 

Before joining Amrita, Dr. Vayalakkara worked at Nanyang Technological University in Singapore teaching courses in Mathematics and Fluid Mechanics and doing research in Surface Wave Dynamics under the Singapore-Stanford Partnership (SSP) with Stanford University, USA. 

He is a member of the American Association for the Advancement of Science and has been featured in Who's Who in the World and Who's Who in Finance and Industry.


Publication Type: Journal Article
Year of Publication Publication Type Title
2016 Journal Article Va Sivadas, Balaji, K., Sampathkumar, Mc, Hassan, M. Md, Karthik, K. Me, and Saidileep, Kb, “Empirical Correlation of the Primary Stability Variable of Liquid Jet and Liquid Sheet under Acoustic Field”, Journal of Fluids Engineering, Transactions of the ASME, vol. 138, 2016.[Abstract]

The investigation focuses on optimizing the length of wind-pipe that transmits acoustic energy from the compression driver to the cavity of twin-fluid atomizers. To accomplish this objective, the primary variable of stability, that is, the breakup length of liquid jet and sheet under acoustic perturbations has been experimentally characterized for a range of wind-pipe length and liquid velocity. The analysis considers liquid phase Weber number in the range of 0.7-8, and the results are compared with primary breakup data without acoustic perturbations. The range of Weber number tested belongs to Rayleigh breakup zone, so that inertia force is negligible compared to surface tension force. It shows the existence of unique stability functions based on dimensionless products up to an optimum wind-pipe length, which extends greater for liquid sheet configuration. The present results may find relevance in atomizer design that utilizes acoustic source to enhance liquid column breakup processes. More »»
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