Intensification of Non-Stationary Nucleate Boiling at Increasing Flow Velocity

Abstract

This paper considers the previously discovered by the authors non-monotonic effect of the water velocity on the nucleate boiling of a subcooled flow. We present experimental results for the following conditions: initial pressure 0.18 and 0.48 MPa, subcooling level 54 and 120 K, initial flow velocity in the range from 0 to 1.73 m/s, and carry out numerical analysis of the model for nonstationary nucleate boiling. We have studied the results of the numerical analysis of heat fluxes for individual nucleation centers and their influence on the overall thermal picture in the near-wall layer. It is shown that the heat transfer enhancement in the neighborhood of the nucleation centers for liquid velocities of ∼0.4 m/s may result in the increase of the generated vapor volume.

Acknowledgements

This research was performed at the Melentiev Energy Systems Institute SB RAS using the equipment of the High-Temperature Circuit Multi-Access Research Center and was funded by the Russian Foundation for Basic Research, Grant No. 18-29-10019.

Additional information

Notes on contributors

Anatoliy Levin

Anatoliy Levin is a head of the Laboratory for Dynamic of Steam-generating systems at Melentiev Energy Systems Institute, Russia. He received his Ph.D. from Melentiev Energy Systems Institute in 2008. His research interests include nucleate boiling, unsteady heat transfer, and mathematical modeling of thermal plants equipment. He is an elected member of the Scientific Council of the International Centre for Heat and Mass Transfer (ICHMT).

Polina Khan

Polina Khan is a senior researcher at the Laboratory for Dynamic of Steam-generating systems at Melentiev Energy Systems Institute, Russia. She received her Ph.D. from Yeungnam University, School of Mechanical Engineering, in 2006. Her research interests include nucleate boiling, unsteady heat transfer, and multiphase flow.