Laminar Forced Convection Heat Transfer in the Combined Entry Region of Non-Circular Ducts-Reference-Cited by-同舟云学术

Laminar Forced Convection Heat Transfer in the Combined Entry Region of Non-Circular Ducts

Published:2004-02-01 Issue:1 Volume:126 Page:54-61
ISSN:0022-1481
Container-title:Journal of Heat Transfer
language:en
Short-container-title:

Author:

Muzychka Y. S.¹,Yovanovich M. M.²

Affiliation:

1. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NF, Canada, A1B 3X5

2. Department of Mechanical Engineering, University of Waterloo, Waterloo, ON, Canada, N2L 3G1

Abstract

A new model for predicting Nusselt numbers in the combined entrance region of non-circular ducts and channels is developed. This model predicts both local and average Nusselt numbers and is valid for both isothermal and isoflux boundary conditions. The model is developed using the asymptotic results for convection from a flat plate, thermally developing flows in non-circular ducts, and fully developed flow in non-circular ducts. Through the use of a novel characteristic length scale, the square root of cross-sectional area, the effect of duct shape on Nusselt number is minimized. Comparisons are made with several existing models for the circular tube and parallel plate channel and with numerical data for several non-circular ducts. Agreement between the proposed model and numerical data is within ±15percent or better for most duct shapes.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Link

http://asmedigitalcollection.asme.org/heattransfer/article-pdf/126/1/54/5737213/54_1.pdf

Reference26 articles.

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2. Churchill, S. W., and Ozoe, H., 1973, “Correlations for Laminar Forced Convection in Flow Over an Isothermal Flat Plate and in Developing and Fully Developed Flow in an Isothermal Tube,” ASME J. Heat Transfer, 95, pp. 416–419.

3. Baehr, H., and Stephan, K., 1998, Heat Transfer, Springer-Verlag.

4. Stephan, K., 1959, “Warmeubergang und Druckabfall bei Nicht Ausgebildeter Laminar Stromung in Rohren und in Ebenen Spalten,” Chem-Ing-Tech, 31, pp. 773–778.

5. Garimella, S., Dowling, W. J., Van derVeen, M., Killion, J., 2000, “Heat Transfer Coefficients for Simultaneously Developing Flow in Rectangular Tubes,” Proceedings of the 2000 International Mechanical Engineering Congress and Exposition, Vol. 2, pp. 3–11.

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