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Local measurement of forced convection heat transfer in a micro glass tube

Schilder, B. and Yu, S. C. M. and Kasagi, N. and Hardt, Steffen and Stephan, Peter (2008):
Local measurement of forced convection heat transfer in a micro glass tube.
In: ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels, ASME, pp. 543-550, DOI: 10.1115/ICNMM2008-62054, [Online-Edition: http://dx.doi.org/10.1115/ICNMM2008-62054],
[Book Section]

Abstract

The pressure drop and the convective heat transfer characteristics of ethanol and water in a 600 \textgreekmm 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.

Item Type: Book Section
Erschienen: 2008
Creators: Schilder, B. and Yu, S. C. M. and Kasagi, N. and Hardt, Steffen and Stephan, Peter
Title: Local measurement of forced convection heat transfer in a micro glass tube
Language: English
Abstract:

The pressure drop and the convective heat transfer characteristics of ethanol and water in a 600 \textgreekmm 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.

Title of Book: ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels
Publisher: ASME
ISBN: 0-7918-4834-5
Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute for Technical Thermodynamics (TTD)
Exzellenzinitiative
Exzellenzinitiative > Clusters of Excellence
Zentrale Einrichtungen
Exzellenzinitiative > Clusters of Excellence > Center of Smart Interfaces (CSI)
16 Department of Mechanical Engineering > Institute for Nano- and Microfluidics (NMF)
Event Title: ASME 6th International Conference Nanochannels, Microchannels, Minichannels
Event Location: Darmstadt
Event Dates: 23.-25.06.2008
Date Deposited: 26 Apr 2011 12:05
DOI: 10.1115/ICNMM2008-62054
Official URL: http://dx.doi.org/10.1115/ICNMM2008-62054
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