Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements
Name
#4_MITOA_Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements.pdf
Description
Accepted version
Size
1.37 MB
Format
Adobe PDF
Checksum (MD5)
4010221617748719becc5214a277da90
Author(s)
Su, G.- Y.
Phillips, Bren Andrew
Buongiorno, Jacopo
Date Issued
August 2019
Journal
18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019
Publisher
American Nuclear Society
Citation
Su, G.- Y. et al. “Unexpected heat transfer oscillations in steady annular flow detected by synchronized infrared and liquid film sensor measurements.” 18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019, 2019, (August 2019): 5709 - 5715 © 2019 The Author(s)
Version
Author's final manuscript
Abstract
Simultaneous measurement of liquid film characteristics and heat transfer in annular two-phase flow is a major experimental challenge. In this study, we implement an innovative integrated infrared (IR) heater and liquid film electrical-conductance sensor in combination with high-speed IR thermography, which results in an accurate, synchronized and co-located measurement of liquid film characteristics and local heat transfer at the heated surface in diabatic annular two-phase flow. The measurements reveal that disturbance waves have a significant effect on the instantaneous heat transfer response in nominally-steady vertically upward annular flow of steam-water mixtures. Although the heat flux applied at the wall is constant in time, the passage of the waves causes significant periodic oscillations of the local heat transfer coefficient and wall superheat in the forced convective evaporation regime, which are reported in this study.
MIT Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
