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3D VISUALIZATION OF LOCAL HEAT TRANSFER COEFFICIENTS ON AIRCRAFT HEAT EXCHANGER
Keywords:
heat transfer coefficient, temperature oscillation method, Reynolds number.DOI:
https://doi.org/10.17654/0973576322063Abstract
This paper deals with the measurement of local and average values of the heat transfer coefficient on the oil side of an aircraft heat exchanger. We used a dynamic method of thermal oscillations for the measurement, which allows such measurement with sufficient accuracy and incredible speed. The measurement was divided into three separate tasks, namely the top, side and front of the exchanger and was performed in the range of 0.1 to 0.7 kg/s oil mass flow. The resulting distributions of the intensity of heat transfer correspond to the assumptions, more significant ambiguities were on the front, where problems with glare effects appeared. Rather, the average values as a function of mass flow indicate laminar flow, which was confirmed by a simple calculation of the Reynolds number. Overall, the temperature oscillation method has proven to be a very suitable and fast tool for monitoring local heat transfer coefficients in a heat exchanger.
Received: October 16, 2022;
Accepted: November 28, 2022;
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