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research-article

Characterization of Thermal Striping in Liquid Sodium with Optical Fiber Sensors

[+] Author and Article Information
Matthew Weathered

University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53715
weathered@wisc.edu

Jordan Rein

University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53715
jdrein@wisc.edu

Mark Anderson

University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53715
manderson@engr.wisc.edu

Paul Brooks

University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53715
pwbrooks@wisc.edu

Bryan Coddington

University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53715
bryan.coddington@wisc.edu

1Corresponding author.

ASME doi:10.1115/1.4037118 History: Received January 11, 2017; Revised June 12, 2017

Abstract

This study characterizes the magnitude, spatial profile, and frequency spectrum of thermal striping at a junction using a novel sodium deployable optical fiber temperature sensor. Additionally, this study reveals for the first time the capability of performing cross correlation velocimetry with an optical fiber to acquire fluid flow rates in a pipe. Optical fibers were encapsulated in stainless steel capillary tubes with an inert cover gas for high temperature sodium deployment. Plots of temperature oscillation range as a function of two dimensional space highlighted locations prone to mechanical failure for particular flow momentum ratios. The power spectral density revealed that these temperature oscillations occurred at frequencies ranging from 0.1-6 Hz. Finally, the bulk flow rate of liquid sodium was calculated from thermal striping's periodic temperature oscillations using cross correlation velocimetry for flow rates of 0.25-5.76 L/min.

Copyright (c) 2017 by ASME
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