A knowledge based database system for jet impingement heat transfer correlations

Moss, MA, 1993. A knowledge based database system for jet impingement heat transfer correlations. PhD, Nottingham Trent University.

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Abstract

A database containing correlations and graphical data for the heat transfer due to single and multiple impinging air Jets has been assembled. A knowledge based database system has been constructed which assists the formulation of a simple description of geometry and flow and, using this description, retrieves and evaluates only the relevant and valid information. Where the information in the database does not satisfy this specification the system has the capability either to select the most appropriate information for extrapolation or to modify the database query to select alternative information.

Available selection techniques, both in database systems and in knowledge based systems, are not sufficiently specific for a correlation information system. Consequently a network of descriptive keywords and associated Information, based on a detailed review of the jet impingement heat transfer literature, is used to control the selection process. Additional Information, associated with each correlation, is used in determining whether the correlation is appropriate to the geometry and flow described.

The program described not only enables new correlations to be added as they appear but also enables the knowledge in the network to be extended to accommodate the addition of correlations for new geometries and flow conditions. Because of the integration of the knowledge base and the database new information must satisfy additional constraints, which are identified, to enable it to be interpreted correctly.

The Information in the system developed is confined to the heat transfer due to impinging jets but it is believed that the methods developed are more widely applicable.

A correlation for a single orthogonally Impinging air jet has been developed from experimental data extracted from the literature. Heat transfer coefficients may be derived for jet Reynolds numbers in the range 5000 to 124000 and nozzle-to-plate spacings of 1.2, 5 and 10. The correlation provides a more appropriate variation of the exponent of Reynolds number between the values appropriate to a laminar boundary layer and a turbulent boundary layer than existing correlations given in the literature.

Item Type:	Thesis
Creators:	Moss, M.A.
Date:	1993
ISBN:	9781369324587
Identifiers:	Number Type PQ10290209 Other
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	16 Jun 2021 15:33
Last Modified:	17 Oct 2023 14:29
URI:	https://irep.ntu.ac.uk/id/eprint/43099

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