Abstract
In order to investigate the characteristics of step response and heat transfer of an optical fiber thermometer (OFT) having a tip of a 1.27mm diameter sapphire rod sputtered with platinum, OFT heated up to 1000°C was rapidly inserted into a potential core region of a free room-temperature air jet using pendulum motion. The time constant, the heat transfer coefficient of OFT, and the correlation of Nu=(3.07+0.529Re0.5) Pr0.38 for Re=380-1800 were obtained. Uncertainty analysis was also carried out to support the conclusions. OFT output shows a very slow response at the quasi-steady period but a considerably quick response at the transient period. It is also made clear that the OFT response at the quasi-steady period is close to a first-order response. Very good agreement is obtained between experiment and numerical simulations, assuming one-dimensional unsteady-state heat conduction inside the sapphire rod.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
