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Development of algorithm to measure temperatures of liquid/gas phases using micro-thermocouple and experiment with optical chopper

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Abstract

This paper introduces the algorithm developed to measure the local temperature of phases in the non-isothermal two-phase flow by using micro-thermocouple, which was verified using an optical chopper and a laser. The micro-thermocouple, whose outer diameter of which is 12.7 μm, consists of a couple of alumel-chromel wire (K-type). The hot-junction, a part of the sensor used to for measuring temperature, is fabricated by hot-wire shapes. The response time of the micro-thermocouple, which was measured by dynamic calibration method, was several milliseconds in flow condition. An algorithm to calculate the temperature of each, which is based on the response time of micro-thermocouple and the exponential regression method, was developed. And the developed algorithm was verified through experiments using an optical chopper and a laser.

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Abbreviations

A :

Area (m2)

Cp :

Specific heat (J/kgK)

h :

Convection heat transfer coefficient (J/m2K)

I, Y :

Coefficient matrix

l :

Width to calculate averaged temperature (sec)

s:

Width to calculate ATD (sec)

t :

Time (sec)

T :

Temperature (°C)

V :

Volume (m3)

α,β,γ:

Coefficient

ρ:

Density (kg/m3)

τ:

Time constant (sec)

Λ:

Coefficient matrix

air:

Air

bubble:

Bubble

threshold:

Threshold

exp:

Experiment

i :

i-th position

J :

Junction

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Authors and Affiliations

  1. Department of Nuclear Engineering, Seoul National University, Nuclear thermal hydraulics engineering laboratory, 31-205, San 56-1, Sillimdong, Kwanakgu, 151-742, Seoul, Korea

    Seong-Jin Kim

  2. Department of Nuclear Engineering, Seoul National University, Nuclear thermal hydraulics engineering laboratory, 32-213, San 56-1, Sillimdong, Kwanakgu, 151-742, Seoul, Korea

    Goon-Cherl Park

Authors
  1. Seong-Jin Kim
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  2. Goon-Cherl Park
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Correspondence to Seong-Jin Kim.

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Kim, SJ., Park, GC. Development of algorithm to measure temperatures of liquid/gas phases using micro-thermocouple and experiment with optical chopper. J Mech Sci Technol 21, 184–195 (2007). https://doi.org/10.1007/BF03161724

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  • DOI: https://doi.org/10.1007/BF03161724

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