Title page for ETD etd-06122008-125449


Type of Document Dissertation
Author Zhou, Fuguo
URN etd-06122008-125449
Title Internal Cooling in Ribbed Rectangular (AR=4:1) Passages at High Rotation Numbers and Improvement in Finning Strategies
Degree Doctor of Philosophy (Ph.D.)
Department Engineering Science (Interdepartmental Program)
Advisory Committee
Advisor Name Title
Sumanta Acharya Committee Chair
Dimitris E. Nikitopoulos Committee Member
Guoli Ding Committee Member
John M. Tyler Committee Member
Bin Li Dean's Representative
Keywords
  • heat exchanger
  • internal passage
  • cooling
  • rotating
  • heat transfer
  • fin
  • turbine blade
Date of Defense 2007-12-20
Availability unrestricted
Abstract
Experimental studies have been performed on two-pass rectangular internal coolant channels with aspect ratio AR 4:1 with high rotation numbers. Three passages are investigated: smooth, 90 deg ribbed and 45 deg ribbed. A maximum Reynolds number of 150,000 and a maximum rotation number of 0.6 are achieved in the study. These maximum parameter values are considerably higher than those previously reported for the 4:1 AR geometry, and provide data for parameter ranges that may be representative of certain modern turbine blades. Heat transfer behaviors with rotation in the three passages are presented. Rotation effects, density effects and buoyancy effects are discussed. Friction factors and thermal performance factors are also provided. In addition, innovative finning strategies are proposed and tested in a straight stationary rectangular channel using transient liquid crystal method aiming to enhance the heat transfer rate of heat exchangers. The test results show an overall heat transfer rate of 3 and above for Reynolds numbers up to 65,000.
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