The local time-averaged temperature and its fluctuating component on the surface of a heated circular cylinder immersed in a cylinder near-wake were measured using a fiber-optic Bragg grating (FBG) sensor. Three cylinder center-to-center spacing, i.e., 2.50, and 1.18, were investigated. In order to validate the FBG sensor measurement, a thermocouple and a single hot-wire were employed to measure on the heated cylinder and streamwise fluctuating velocity in the near-wake of the downstream cylinder, respectively. The FBG sensor measurement of is in good agreement with that simultaneously obtained by the thermocouple. The measured is closely correlated to the hot-wire measurement; the -spectrum exhibits a pronounced peak at the vortex shedding frequency, as identified in for each The results suggest that the FBG sensor can be used to measure reliably both time-averaged and fluctuating temperatures. The heat transfer characteristics of the heated cylinder are examined for different and further compared with the case of an isolated cylinder.
Fluctuating Temperature Measurements on a Heated Cylinder Placed in a Cylinder Near-Wake
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division June 26, 2003; revision received November 19 2003. Associate Editor: P. M. Ligrani.
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Wang , Z. J., Zhou, Y., Wang , X. W., and Jin, W. (March 10, 2004). "Fluctuating Temperature Measurements on a Heated Cylinder Placed in a Cylinder Near-Wake ." ASME. J. Heat Transfer. February 2004; 126(1): 62–69. https://doi.org/10.1115/1.1643910
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