Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Apparatus for Comparing Thermal Conductivity of Nanofluids and Base Fluid Using Simultaneously Measured Resistance Variation Signals from Two Hot Wire Sensors

동시에 측정된 두 열선센서의 저항변화 신호를 이용한 나노유체와 기본유체의 열전도율 비교장치

  • 이신표 (경기대학교 공과대학 기계시스템공학과)
  • Received : 2014.05.12
  • Accepted : 2014.10.02
  • Published : 2015.01.01
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Abstract

Exact comparisons of the thermal conductivities of the base fluid and a nanofluid are very important in the early stages of nanofluid development. A simple procedure of measuring the thermal conductivity of the two fluids by the transient hot wire method and numerically dividing these values is used for this purpose. However, because the experiments are not performed simultaneously and the physical properties of the measurement system are sometimes not properly known, large errors are incurred during the evaluation process. This article proposes a new apparatus for thermal conductivity comparison where the working principle is mainly based on relative measurement rather than absolute measurement. The measuring circuit and data processing steps are explained in detail; a validation test was performed using the well-known glycerine and engine oil.

나노유체 개발 초기단계에서 기본유체 대비 제조한 나노유체의 열전도율이 얼마나 상승했는지 그 값을 정확히 비교하는 것이 중요하다. 지금까지는 기본유체와 나노유체의 열전도율을 비정상열선법으로 별도 측정한 후 수치적으로 나누어 비교하는 단순한 방법을 사용하였다. 이 때 두 유체의 열전도율 측정이 동시에 이루어지지 않고 절대측정방법의 특성상 측정시스템의 관련 수치들이 정확히 사용되지 않으면 개별 열전도율에 나타나는 오차를 피할 수 없다. 본 연구에서는 비교대상인 두 유체를 동시에 사용하여 열전도율 비를 상대적으로 측정하는 새로운 방법을 제시하였다. 기존 비정상열선법 회로를 변형한 측정회로와 데이터 처리과정을 자세히 설명하였고 엔진오일과 글리세린을 이용한 검증실험을 통하여 제시된 방법의 타당성을 검토하였다.

Keywords

References

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