Journal article

Probing the high mixing efficiency events in a lock-exchange flow through simultaneous velocity and temperature measurements

Tanmay Agrawal, Bhaarath Ramesh, Spencer J Zimmerman, Jimmy Philip, Joseph C Klewicki

PHYSICS OF FLUIDS | AMER INST PHYSICS | Published : 2021

Abstract

Gravity currents produced by a lock-exchange flow are studied using high-resolution molecular tagging techniques. Instead of employing salt to produce density stratification, an initial temperature difference is introduced in the system to generate the ensuing gravity currents. The experiments focus on the interface between the hot and cold fluids to characterize the resultant mixing across the interface. The present measurements spatially resolve the flow to smaller than the Kolmogorov scale and close to the Batchelor scale. This enables reasonably accurate estimates of velocity and density gradients. The measured density (temperature) distribution allowed estimation of the background poten..

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Grants

Funding Acknowledgements

The authors are grateful to the financial support provided by the Australian Research Council. Thanks are due to Mr. Pamoda Herath and Dr. Saurabh Pathak for their assistance in conducting the large field-of-view 1c-MTV/MTT experiments. We would also like to extend our thanks to the anonymous reviewers for their comments and suggestions that certainly improved the content and clarity of the manuscript.