The pressure drop and the convective heat transfer characteristics of ethanol and water in a circular tube with a diameter of with and without phase change have been studied experimentally. The test section consists of a glass tube coated with a transparent indium tin oxide heater film. For single-phase liquid flow (including superheated liquid) 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. Wavy patterns on the film surface indicate shear forces between vapor and liquid phase during slug flow. Temporary dryout phenomena occur even at a low mean vapor quality due to film rupture as a result of film instabilities. Local Nusselt numbers are calculated for the two-phase flow at different heat fluxes and Reynolds numbers. Compared with single-phase flow the heat transfer is enhanced by a factor of 3–8.
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Flow Visualization and Local Measurement of Forced Convection Heat Transfer in a Microtube
Boris Schilder,
Boris Schilder
Department of Mechanical Engineering,
Technische Universitaet Darmstadt
, Petersenstrasse 30, 64287 Darmstadt, Germany
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Simon Yu Ching Man,
Simon Yu Ching Man
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Singapore
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Nobuhide Kasagi,
Nobuhide Kasagi
Department of Mechanical Engineering,
University of Tokyo
, Tokyo 113-8656, Japan
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Steffen Hardt,
Steffen Hardt
Center of Smart Interfaces,
Technische Universitaet Darmstadt
, Darmstadt D-64287, Germany
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Peter Stephan
Peter Stephan
Department of Mechanical Engineering,
e-mail: p.stephan@ttd.tu-darmstadt.de
Technische Universitaet Darmstadt
, Petersenstrasse 30, 64287 Darmstadt, Germany
Search for other works by this author on:
Boris Schilder
Department of Mechanical Engineering,
Technische Universitaet Darmstadt
, Petersenstrasse 30, 64287 Darmstadt, Germany
Simon Yu Ching Man
School of Mechanical and Aerospace Engineering,
Nanyang Technological University
, 50 Nanyang Avenue, Singapore 639798, Singapore
Nobuhide Kasagi
Department of Mechanical Engineering,
University of Tokyo
, Tokyo 113-8656, Japan
Steffen Hardt
Center of Smart Interfaces,
Technische Universitaet Darmstadt
, Darmstadt D-64287, Germany
Peter Stephan
Department of Mechanical Engineering,
Technische Universitaet Darmstadt
, Petersenstrasse 30, 64287 Darmstadt, Germanye-mail: p.stephan@ttd.tu-darmstadt.de
J. Heat Transfer. Mar 2010, 132(3): 031702 (9 pages)
Published Online: January 4, 2010
Article history
Received:
October 20, 2008
Revised:
July 31, 2009
Online:
January 4, 2010
Published:
January 4, 2010
Citation
Schilder, B., Man, S. Y. C., Kasagi, N., Hardt, S., and Stephan, P. (January 4, 2010). "Flow Visualization and Local Measurement of Forced Convection Heat Transfer in a Microtube." ASME. J. Heat Transfer. March 2010; 132(3): 031702. https://doi.org/10.1115/1.4000046
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