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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

THE HEAT TRANSFER MODEL OF COATING VOLATILE RESISTANCE AND RADIATION CHARACTERISTICS TEST DEVICE

Dongyang An
School of Electrical Engineering and Automation, Harbin Institute of Technology,Harbin,150001,China

Peng Xiao
School of Electrical Engineering and Automation, Harbin Institute of Technology,Harbin,150001,China

Xiaoman Guo
School of Electrical Engineering and Automation, Harbin Institute of Technology,Harbin,150001,China

Jingmin Dai
School of Electrical Engineering and Automation, Harbin Institute of Technology,Harbin,150001,China

Abstract

Oxidation coating is widely used in high temperature equipment, the heat transfer mechanism research of oxidation coating has a slow progress. As a heating technology, direct resistance heating has been widely used in test equipment which can measure volatile resistance and radiation characteristics over 2000 °C. Direct resistance heating is considered as a comparatively accurate method for the measurement of very high temperatures. The estimation of total emissivity is based on various computational methods derived by assuming that the temperature is uniform in the central part of the specimen. The validity of this approach was verified when specimens with large cross sections and when the temperature on the specimen surface was measured. A numerical model was established with the temperature variations across the specimen was taken into consideration. The mathematical model established can be used in the simulation experiments to access the magnitude of specific phenomena due to the temperature gradient inside the specimen. The simulation results will improve the accuracy of interception of sample and contribute to the development of the equipment.

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