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

The Korean Society of Mechanical Engineers (대한기계학회)
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Measuring Convective Heat Transfer Coefficients of Nanofluids over a Circular Fine Wire Maintaining a Constant Temperature

등온으로 유지되는 가는 열선주위를 흐르는 나노유체의 대류열전달계수 측정실험

  • 이신표 (경기대학교 기계시스템공학과)
  • Received : 2011.04.29
  • Accepted : 2011.07.21
  • Published : 2012.01.01
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Abstract

This paper describes a measuring apparatus that can be used to appraise the effectiveness of nanofluids as new heat-transfer-enhancing fluids. A couple of apparatuses using fine hot wires as sensors have been proposed for this purpose; however, they have a technical weakness related to the uncertain working conditions of the sensor. The present method uses the convective heat transfer coefficient from a hot wire as an indication of the heat transfer effectiveness of the nanofluid, where the temperature of the wire remains constant during the experiment. The operating principle and experimental procedure are explained in detail, and the validity of the system is tested with pure base fluids. The effects of particle concentration, velocity, and temperature on the heat transfer coefficients of the nanofluids are discussed comprehensively using the experimental data for graphite nanolubrication oil.

본 논문은 열전달 유체로서 나노유체의 유용성을 평가하기 위한 장치를 설명한 것이다. 열선센서를 이용한 나노유체 대류성능 평가장치는 몇 가지가 제안되었으나 센서의 작동조건이 불명확한 단점이 있었다. 본 연구에서는 일정한 온도로 유지되는 가는 열선 주위를 흐르는 대류열전달계수를 측정하여 나노유체의 유용성을 평가하였다. 제시된 장치의 동작원리와 실험방법을 자세히 설명하였으며 먼저 순수유체에 대한 실험을 통하여 장치의 타당성을 검증하였다. 그래파이트 나노오일을 이용하여 대류열전달계수에 미치는 농도와 속도 그리고 온도의 영향을 종합적으로 고찰하였다.

Keywords

References

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  2. Apparatus for Comparing Thermal Conductivity of Nanofluids and Base Fluid Using Simultaneously Measured Resistance Variation Signals from Two Hot Wire Sensors vol.39, pp.1, 2015, https://doi.org/10.3795/KSME-B.2015.39.1.029