Measurement of heat transfer in the entrance region of small diameter tubes

Ting Yu Lin, Chien Yuh Yang, Satish G. Kandlikar

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

Heat transfer coefficient in the entrance region of water flowing through micro-tubes with diameters of 962 μm and 123 μm was investigated in this study. Two temperature measurement methods, thermocouple and liquid crystal thermography (LCT), were used to measure the tube surface temperature. The experimental data showed mat the Nu in the entrance region can be predicted well by conventional correlation while using the LCT to measure the temperature. Using the temperature measurements from the thermocouples attached to the surface, the Nu is found to be significantly higher than the prediction. This was believed to be due to the error in measurement of temperature. Simulation results also revealed that the measured temperature for a small diameter tube can be significantly decreased with a thermocouple attached to it. In transition flow, the wall temperature was also found to have a significantly fluctuation, as large as 2 °C, due to the unsteady flow conditions, while for fully established laminar as well as turbulent flow conditions, the fluctuation was measured to be less than 0.2 °C The effect of viscous heating was negligible in the range of parameters investigated in this study.

Original languageEnglish
Title of host publicationProceedings of the 7th International Conference on Nanochannels, Microchannels, and Minichannels 2009, ICNMM2009
Pages623-630
Number of pages8
EditionPART A
DOIs
StatePublished - 2009
Event7th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2009 - Pohang, Korea, Republic of
Duration: 22 Jun 200924 Jun 2009

Publication series

NameProceedings of the 7th International Conference on Nanochannels, Microchannels, and Minichannels 2009, ICNMM2009
NumberPART A

Conference

Conference7th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2009
Country/TerritoryKorea, Republic of
CityPohang
Period22/06/0924/06/09

Keywords

  • Heat transfer coefficient
  • Liquid crystal thermography (LCT)
  • Micro-tubes
  • Small diameter tubes
  • Transition flow
  • Transition to turbulent

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