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International Heat Transfer Conference 11

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

RADIATION AND CONVECTION HEAT FLUX MEASUREMENT

Nelson Martins
Mechanical Engineering Department Instituto Superior Técnico 1096 Lisbon Codex Av. Rovisco Pais Portugal

Maria da Graca Carvalho
Instituto Superior Técnico, Lisbon, Portugal

Naim Hamdia Afgan
Instituto Superior Técnico, Lisbon, Portugal

Alexander Leontiev
Joint Institute for High Temperatures

要約

The heat flux measurement is one of the essential parameter for the diagnostic of thermal systems. In the high temperature environment there are difficulties in differentiating between the convective and radiation component of heat flux on the heat transfer surface. A new method for heat flux measurement is being developed using a porous sensing element. The gas stream flowing through the porous element is used to measure the heat received by the sensor surface exposed to the hot gas environment.
A numerical model of sensor with appropriate boundary condition has been developed in order to perform analysis of possible options in the design of the sensor. The analysis includes: geometry of element, physical parameters of gas and solid and gas flow rate through the porous element.
For the optimal selection of parameters an experimental setup was designed, including the sensor element with corresponding cooling and monitoring system and high an temperature radiation source. Applying respective measuring procedure the calibration curve of the sensor was obtained. The linear dependency of the heat flux and respective temperature difference of the gas was verified. The accuracy analysis of the sensor reading has proved high linearity of the calibration curve and accuracy of ± 5%.

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