Abstract
The blackbody cavity sensor formed by two coaxial tubes has been widely used in continuous temperature measurement of molten steel. However, due to the closed bottom of the inner tube, the temperature accuracy, response time and temperature measurement stability are seriously affected. It’s necessary to redesign and improve sensing mechanism of the traditional design, which involves multidisciplinary knowledge, including materials, heat and flow science. This paper proposes a virtual verification-based design improvement method for blackbody cavity sensor. After redesigning the structure of the sensor, a virtual model for the sensor is established. Through real-world experiment, it is found that for the temperature measurement accuracy, the deviation between the simulation and the real-world experimental result is less than 1.5°C, and for the stability time of temperature measurement, the simulation result has a deviation from the real-world experimental result less than 15%. This verifies the accuracy of the virtual model. On this basis, model simulation for further possible optimal structures and parameters is carried out, and the influence of different nitrogen flow rates and inner tube lengths on the temperature measurement accuracy and the stability time for temperature measurement is further analyzed.
Highlights
The outer tube blocks the erosion of molten steel, which is made of refractory material
For the temperature measurement stability time (MSTime), the deviation is less than 15%
The nitrogen flow rates with 0.25, 0.5, 0.75, 1.0, 1.2, 1.5 and 2.0 (m3/h) and the distances from the bottom of inner tube to target surface with 200, 300, 390, 450 and 550 are considered in the following simulation to find the influence of temperature MSTime
Summary
Based on the verified virtual model, the design improvement can be carried out through simulation, including the influence of different nitrogen flow rates and inner tube’s lengths on the temperature measurement accuracy and temperature MSTime. 4) MULTIPHASE FLOW AND INTERPHASE EXCHANGE MODEL There is a phase change between soot particle and soot vapor in the cavity of the sensor. F: HEAT EXCHANGE MODEL BETWEEN EACH PHASE In the process of interaction between the three phases, nitrogen, soot particle and soot vapor in the cavity have heat exchange with each other, which can be considered as a function of the temperature difference between different phases [20]. The Nusselt number Nup differs depending on the properties of different phases
Sign-in/Register to view highlights & summary 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 callDisclaimer: 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.
