The Application of Capacitance Transducer for Measuring Local Thickness of Condensate Film in Low-Temperature Range Heat Pipes
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A description is provided for the automated capacitance transducer for measuring local thickness of condensate film of the working fluid in short low-temperature range heat pipes. This paper presents the framework, calibration data for compact open capacitance sensors, and electronic equipment that enables to perform measurements of local thickness of the working fluid at the condensing surface inside the heat pipes. Time-averaged values of the condensate film thickness are measured, depending on the heat load on the capillary-porous evaporator. The measurement error does not exceed 2·10-3mm. It is demonstrated that the condensate film thickness lessens sharply with the increase of the heat load on the evaporator of a short low-temperature heat pipe, while the heat resistance of the film on the condensing surface reaches 60% of the total heat resistance of a short low-temperature heat pipe with the capillary-porous evaporator.
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