JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Measuring Apparatus for Convective Heat Transfer Coefficient of Nanofluids Using a Thermistor Temperature Sensor
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Measuring Apparatus for Convective Heat Transfer Coefficient of Nanofluids Using a Thermistor Temperature Sensor
Lee, Shin Pyo;
  PDF(new window)
 Abstract
Fine wires made from platinum have been used as sensors to evaluate the convection performance of nanofluids. However, the wire sensor is difficult to handle due to its fragility. Additionally, an unrealistic convective heat transfer coefficient (h) is obtained if a rigorous calibration process combined with precision equipment is not used for measurement. This paper proposes a new evaluation apparatus for h of nanofluids that uses a thermistor sensor instead of the platinum wire. The working principles are also explained in detail. Validation experiments for pure engine oil comparing h from the two sensors confirmed numerous practical benefits of the thermistor. The proposed system can be used as a useful tool to justify the adoption of developed nanofluids.
 Keywords
Nanofluids;Pure Fluid;Convective Heat Transfer Coefficient;Thermistor;Platinum Hot Wire;Positive/Negative Temperature Coefficient of Resistance;Cold Resistance;
 Language
Korean
 Cited by
 References
1.
Lee, S., Choi, U. S., Li, S. and Eastman, J. A., 1999, "Measuring Thermal Conductivity of Fluids Containing Oxide Nanoparticles," Journal of Heat Transfer, Vol. 121, pp. 280-289. crossref(new window)

2.
Na, Y. S., 2012, "Effective Thermal Conductivity of Alumina Nanofluids in Laminar Circular Tube Flow," Ph. D. thesis, Seoul National University.

3.
Lee, S., 2008, "Measuring Convective Heat Transfer Coefficient Around a Heated Fine Wire in Cross Flow of Nanofluids," Trans. Korean Soc. Mech. Eng. B, Vol. 32, No. 2, pp. 117-124. crossref(new window)

4.
Lee, S., 2012, "Measuring Convective Heat Transfer Coefficients of Nanofluids over a Circular Fine Wire Maintaining a Constant Temperature," Trans. Korean Soc. Mech. Eng. B, Vol. 36, No. 1, pp. 9-16.

5.
Lee, S., 2015, "Apparatus for Comparing Thermal Conductivity of Nanofluids and Base Fluid Using Simultaneously Measured Resistance Variation Signals from Two Hot Wire Sensors," Trans. Korean Soc. Mech. Eng. B, Vol. 39, No. 1, pp. 29-36. crossref(new window)

6.
Incropera, F. P. and DeWitt, D. P., 2001, Introduction to Heat Transfer, 6th Ed., Wiley, pp. 116-118.

7.
Japan Patent, 3055164, B., 2004, "An acidity or alkalinity like metering device".

8.
Churchill, S. W. and Bernstein, M., 1977, "A Correlating Equation for Forced Convection from Gases and Liquids to a Circular Cylinder in Cross Flow," Journal of Heat Transfer, Vol. 99, pp. 300-306. crossref(new window)

9.
Lee, C., Hwang, Y., Choi, Y., Park, M., Lee, J., Choi, C. and Oh, J., 2008, "Comparative Study to the Tribological Characteristics of Graphite Nano Lubricants after Thermal Degradation," Journal of the KSTLE, Vol. 24, No. 4, pp. 190-195.