Measurement of Local Liquid Temperature Using Micro-Thermocouple in Subcooled Boiling Flow

Abstract

In this paper, the developed algorithm was described, which can discriminate the local phase temperature in the two-phase flow measured by a self-manufactured micro-thermocouple. The algorithm used to calculate the temperature of each phase was based on the response time of the micro-thermocouple and the exponential regression method. This algorithm was verified by conducting experiments with an optical chopper and a laser. This algorithm was also applied to the measurement of the liquid temperature in subcooled boiling flow. The liquid temperature was measured by means of a micro-thermocouple which was made of alumel-chromel wire (K-type) with an outer diameter of 12.7 μm had a response time of several milliseconds. Finally, the liquid temperatures estimated by the developed algorithm in the case of subcooled boiling were used to assess the capability of the CFX-4.2 code.