Viscous Undular Hydraulic Jumps of Moderate Reynolds number Flows

Dasgupta, Ratul and Tomar, Gaurav (2015) Viscous Undular Hydraulic Jumps of Moderate Reynolds number Flows. In: IUTAM Symposium on Multiphase Flows with Phase Change Challenges and Opportunities, DEC 08-11, 2014, Indian Inst Technol, Hyderabad, INDIA, pp. 300-304.

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Abstract

We report simulations of undular hydraulic jumps occuring in a two-phase flow. Unlike undular bores (in rivers), where the interface remains horizontal the low Reynolds hydraulic jumps show linear increase in height of the incoming flow due to viscosity. Consequently, the presence or absence of the undulations depends both on the inlet Froude and Reynolds number unlike bores where a Froude number criterion is traditionally considered sufficient. In our simulations, these undulations display a separated vortex underneath every crest. Despite the strong influence of viscosity, we show that the theory of Benjamin & Lighthill, Proc. Roy. Soc. Ser. A, 1954(6) remains relevant in understanding the occurrence of these undulations. (C) 2015 The Authors. Published by Elsevier B.V.

Item Type:	Conference Proceedings
Series.:	Procedia IUTAM
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	25 Aug 2016 10:04
Last Modified:	25 Aug 2016 10:04
URI:	http://eprints.iisc.ac.in/id/eprint/54571

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