The pressure drop and the convective heat transfer characteristics of ethanol and water in a 600 μm diameter tube with and without phase change has been studied experimentally. The test section consists of a glass tube coated with a transparent ITO (indium tin oxide) heater film. For single phase flow it was found that the measured Nusselt numbers and friction factors are in good agreement with the theoretical values expected from Poiseuille flow. Subsequently, the boiling heat transfer of ethanol was studied. It was found that boiling with bubble growth in both upstream and downstream directions leaving behind a thin evaporating liquid film on the tube wall is the dominant phase change process. Local Nusselt numbers are calculated for the two phase flow at different heat fluxes and Reynolds numbers. Compared to single phase flow the heat transfer is enhanced by a factor of 3 to 8.
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ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
June 23–25, 2008
Darmstadt, Germany
Conference Sponsors:
- Nanotechnology Institute
ISBN:
0-7918-4834-5
PROCEEDINGS PAPER
Local Measurement of Forced Convection Heat Transfer in a Micro Glass Tube
B. Schilder,
B. Schilder
Technische Universitaet Darmstadt, Darmstadt, Germany
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S. C. M. Yu,
S. C. M. Yu
Nanyang Technological University, Singapore
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S. Hardt,
S. Hardt
University of Hanover, Hannover, Germany
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P. Stephan
P. Stephan
Technische Universitaet Darmstadt, Darmstadt, Germany
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B. Schilder
Technische Universitaet Darmstadt, Darmstadt, Germany
S. C. M. Yu
Nanyang Technological University, Singapore
N. Kasagi
University of Tokyo, Tokyo, Japan
S. Hardt
University of Hanover, Hannover, Germany
P. Stephan
Technische Universitaet Darmstadt, Darmstadt, Germany
Paper No:
ICNMM2008-62054, pp. 543-550; 8 pages
Published Online:
June 11, 2009
Citation
Schilder, B, Yu, SCM, Kasagi, N, Hardt, S, & Stephan, P. "Local Measurement of Forced Convection Heat Transfer in a Micro Glass Tube." Proceedings of the ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. Darmstadt, Germany. June 23–25, 2008. pp. 543-550. ASME. https://doi.org/10.1115/ICNMM2008-62054
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