Local heat (mass) transfer in a rotating square channel with ejection holes /
The objective of this experimental investigation is to examine the effects of rotation, flow ejection, and channel orientation on the local heat (mass) transfer distribution for radial outward flow in a square channel, rotating about a perpendicular axis. The application of rotating channels with ej...
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1999.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=730298581&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | The objective of this experimental investigation is to examine the effects of rotation, flow ejection, and channel orientation on the local heat (mass) transfer distribution for radial outward flow in a square channel, rotating about a perpendicular axis. The application of rotating channels with ejection holes can be found in the internal cooling passage of rotors in the high-efficient turbine propulsion engine. In this study, various type of cross section of coolant passage is simplified as a square cross section, The square test channel is oriented so that the direction of rotation was perpendicular or at a 45 ĚŠangle to the leading and trailing wails. The test section is eight hydraulic diameters long. There are eight ejection holes along the leading or trailing wall of the test channel. The diameter of each ejection hole is equal to one-fifth of the channel hydraulic diameter. Naphthalene sublimation technique is used to determine local heat(mass) transfer distribution on the wall with ejection holes and side walls, associated with numerical analysis. For numerical analysis, commercialized software implementing finite difference method is used along with grid generating software. The rotation numbers of 0 to [] 0.24 with constant Reynolds number of 5,500, are examined. Utilizing the results of numerical analysis, the new data reduction procedure for the naphthalene sublimation method is developed and the resultant uncertainty of mass transfer coefficient is decreased down to 9.84%. When constant bulk naphthalene vapor density was used, the uncertainty of mass transfer coefficient was 21.85%. As a result of the experiment, the mass transfer distributions on the measured three walls of a normally or diagonally rotating channel with ejection holes are presented. The computed flow fields inside the channel are also presented with vector plots and contour plots, to show three-dimensional motion of the fluid. Finally, the explanations of fluid mechanism onto mass transfer distributions for the given conditions are attempted. |
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| Item Description: | Vita. "Major Subject: Mechanical Engineering". |
| Physical Description: | xiii, 149 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilm Inc. |
| Bibliography: | Includes bibliographical references (leaves 93-96). |