@article{2485a58703684f85b750c93d38162236,
title = "Flow transition and hydrothermal wave instability of thermocapillary-driven flow in a free rectangular liquid film",
abstract = "Thermocapillary-driven flow in a free liquid film, which has two gas-liquid interfaces, is experimentally investigated. Silicone oil of 5 cSt is employed as the test fluid. Two-dimensional basic flow known as {\textquoteleft}double-layered flow{\textquoteright} after Ueno and Torii (2010) is realized under small-enough Marangoni number Ma, the non-dimensional number to describe the intensity of thermocapillary effect, under the geometry considered in the present study. The flow exhibits a transition from the two-dimensional steady flow state to the three-dimensional oscillatory state when the intensity of the imposed thermocapillary effect along the free surfaces exceeds the threshold. In this oscillatory regime, two types of hydrothermal wave instabilities are observed: the traveling-wave flow and the standing-wave flow. We especially focus on the traveling-wave instability and compare it with a hydrothermal wave in a liquid layer with a single free surface investigated by other researchers.",
keywords = "Flow pattern, Free liquid film, Hydrothermal wave, Thermocapillary effect, Traveling wave",
author = "Toshiki Watanabe and Yosuke Kowata and Ichiro Ueno",
note = "Funding Information: We would like to acknowledge Dr. Donald R. Pettit, from the National Aeronautics and Space Administration (NASA), for fruitful discussion. Mr. Takeshi Katsuta, Ms. Natsuki Ishikawa, and Mr. Linhao Fei, former students of the Graduate School of Tokyo University of Science, are acknowledged for their invaluable helps in carrying out the series of experiments. This work was partially supported by Grant-in-Aid for Challenging Exploratory Research from Japan Society for the Promotion of Science (JSPS) (Grant No.: 16K14176 ). The author IU acknowledges the support by Fund for Strategic Research Areas from Tokyo University of Science. Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd",
year = "2018",
doi = "10.1016/j.ijheatmasstransfer.2017.09.059",
language = "English",
volume = "116",
pages = "635--641",
journal = "International Journal of Heat and Mass Transfer",
issn = "0017-9310",
publisher = "Elsevier Limited",
}