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Article
Effects of gravity and surface tension and interfacial-waves and heat-transfer rates in internal condensing flows
ASME 2003 Heat Transfer Summer Conference
  • Q. Liang, Michigan Technological University
  • X. Wang, Michigan Technological University
  • A. S. Barve, Michigan Technological University
  • Amitabh Narain, Michigan Technological University
Document Type
Conference Proceeding
Publication Date
7-21-2003
Abstract
The paper presents accurate numerical solutions of the full 2D governing equations for steady and unsteady laminar/laminar internal condensing flows. The chosen geometry allows for film condensation on the bottom wall of a tilted (from vertical to horizontal) channel. It is found that it is important to know whether the exit conditions are constrained or unconstrained because incompressible vapor flows occur only for exit conditions that are unconstrained. For the incompressible vapor flow situations, a method for computationally obtaining the stable steady/quasi-steady solutions is given here and the resulting solutions are shown to be in good agreement with some relevant experimental data for horizontal channels. These solutions are shown to be sensitive to the frequency-content and strength of ever-present minuscule transverse vibrations of the condensing surface. The effects of noise-sensitivity, gravity (terrestrial to zero-gravity), and surface tension on the attainability of stable steady/quasi-steady solutions, structure of superposed waves, and heat-transfer rates are discussed. It is shown that significant enhancement in wave-energy and heat-transfer rates are possible by designing the condensing surface noise to be in resonance with the intrinsic waves.
Publisher's Statement

© 2003 by ASME. Publisher’s version of record: http://dx.doi.org/10.1115/HT2003-47472

Citation Information
Q. Liang, X. Wang, A. S. Barve and Amitabh Narain. "Effects of gravity and surface tension and interfacial-waves and heat-transfer rates in internal condensing flows" ASME 2003 Heat Transfer Summer Conference Vol. Heat Transfer: Volume 2 (2003) p. 663 - 670
Available at: http://works.bepress.com/a-narain/21/