A fiber-optic Bragg grating sensor for simultaneous static and dynamic temperature measurement on a heated cylinder in cross-flow

Z. J. Wang, Y. Zhou, X. W. Wang, Wei Jin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

A fiber-optic Bragg grating (FBG) sensor is proposed to measure the local static temperature ̄θsand the fluctuating temperature θson the surface of a heated circular cylinder subjected to a cross-flow. In order to validate the new technique, a type-K thermocouple and a single hot wire are used to measure ̄θsand the near-wake streamwise fluctuating velocity u, respectively. The FBG sensor measurement of ̄θsagrees well with that simultaneously obtained by the thermocouple. The θs-spectrum exhibits a prominent peak at the vortex shedding frequency, fs*= fsd/U∞≈ 0.2 (U∞is the free-stream velocity and d is the cylinder diameter), consistent with the u-spectrum. In fact, the θsand u signals are almost perfectly correlated at fs*. Furthermore, the measured ̄θsand root mean square value of θsare agreeable with previously reported Nusselt number data. These results demonstrate that the FBG sensor can be used to measure reliably both static and fluctuating temperatures. It is expected that the FBG sensor, because of its uniqueness in many aspects and being at an affordable cost, has an excellent prospect in temperature measurements.
Original languageEnglish
Pages (from-to)2983-2992
Number of pages10
JournalInternational Journal of Heat and Mass Transfer
Volume46
Issue number16
DOIs
Publication statusPublished - 1 Jan 2003

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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