Direct Computational Simulations for Internal Condensing Flows and Results on Attainability/Stability of Steady Solutions, Their Intrinsic Waviness, and Their Noise Sensitivity
Author:
Narain A.1, Liang Q.1, Yu G.1, Wang X.1
Affiliation:
1. Department of Mechanical Engineering–Engineering Mechanics, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931
Abstract
The paper presents a new two-dimensional computational approach and results for laminar/laminar internal condensing flows. Accurate numerical solutions of the full governing equations are presented for steady and unsteady film condensation flows on a sidewall inside a vertical channel. It is found that exit conditions and noise sensitivity are important. Even for stable steady solutions obtained for nearly incompressible vapor phase flows associated with unconstrained exit conditions, the noise sensitivity to the condensing surface’s minuscule transverse vibrations is high. The structure of waves, the underlying characteristics, and the “growth/damping rates” for the disturbances are discussed. A resonance condition for high “growth rates” is proposed and its efficacy in significantly enhancing wave motion and heat transfer rates is computationally demonstrated. For the unconstrained exit cases, the results make possible a separately reported study of the effects of shear, gravity, and surface tension on noise sensitive stable solutions.
Publisher
ASME International
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference46 articles.
1. Liang, Q., Wang, X., and Narain, A., 2004, “Effects of Gravity, Shear, and Surface Tension in Internal Condensing Flows—Results from Direct Computational Simulations,” (accepted for publication in the ASME Journal of Heat Transfer). 2. Liang, Q., 2003, “Unsteady Computational Simulations and Code Development for a Study of Internal Film Condensation Flows’ Stability, Noise-Sensitivity, and Waviness,” Ph.D. thesis, Michigan Technological University. 3. Krotiuk, W. J., 1990, Thermal-Hydraulics for Space Power, Propulsion, and Thermal Management System Design, American Institute of Aeronautics and Aeronautics, Washington, DC. 4. Faghri, A., 1995, Heat Pipe Science and Technology, Taylor and Francis, Washington, DC. 5. Nusselt, W. , 1916, “Die Oberfla¨chenkondesation des Wasserdampfes,” Z. Ver. Dt. Ing., 60(27), pp. 541–546.
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