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URN etd-0119106-173853 Statistics This thesis had been viewed 2230 times. Download 1179 times. Author Kuo-Shu Hung Author's Email Address No Public. Department Mechanical Engineering Year 2005 Semester 1 Degree Ph.D. Type of Document Doctoral Dissertation Language English Page Count 162 Title Numerical Method for Analysis of Thermal and Flow Fields of Compressible Flow in an Enclosure with Periodically Moving Boundary Keyword Vibration Two-stage pressure correction method Partition Non-Boussinesq fluid. Moving boundary Moving boundary Non-Boussinesq fluid. Partition Two-stage pressure correction method Vibration Abstract The aim of this thesis is to develop a numerical method for analysis of thermal and flow fields of compressible flow in an enclosure with periodically moving boundary. The combined influence of the partitions, movement of the walls, and the buoyancy as well on the flow pattern and heat transfer performance is evaluated. The two-stage pressure correction scheme is developed and modified for simultaneously determining the distributions of absolute pressure, density, temperature, and velocity of the compressible flow field in the enclosure during the start-up and periodically stable periods. The compressible-flow model is adopted, and the governing equations are expressed in integral form and discretized on the staggered grids which may locally or globally deform in resonance with the walls to accommodate the variation in the volume of the enclosure.
The application of this method has been extended to the following topics: (1) thermal convection in a square enclosure with a vibrating wall, (2) flow and thermal fields in an enclosure with two periodically vibrating walls, (3) flow and thermal fields in an enclosure with partitions and two periodically vibrating walls, and (4) pressure effects on natural convection for non-Boussinesq fluid in a rectangular enclosure.
Effects of wall vibration in a rectangular enclosure containing air under various thermal boundary conditions are investigated. The vibrating wall leads to periodic variations in the flow and thermal fields, and also in Nusselt numbers, within the rectangular enclosure, and hence results in remarkable different features in different situations. Major parameters, including frequency, stroke, and the phase angle of the wall vibrations on the flow, are evaluated. For particular situations, the effects of height of aperture formed by adiabatic partitions are added to study.
Advisor Committee Chin-Hsiang Cheng - advisor
C.Y. Soong - co-chair
C.Y. Wen - co-chair
H.T. Chen - co-chair
J.R. Ho - co-chair
P.Y. Tzeng - co-chair
Wei-Mon Yan - co-chair
Files Date of Defense 2006-01-13 Date of Submission 2006-01-19