Abstract
Experimental and numerical investigations of the forced convection heat transfer in flat channels with rectangular cross section are presented in this paper. The heat transfer is enhanced by rib-roughened surfaces applied to the wider walls of the duct. The flow rates have been varied between the Reynolds numbers 500 and 10.000, covering the range from laminar to low turbulent flow. Various configurations (rib: shape, size, spacing, angle of attack, arrangement, duct: width, height, wall temperature) have been investigated. The local heat transfer coefficients have been obtained by holographic interferometry. Local hydrodynamic parameters (with special interest to turbulent kinetic energy and Reynolds shear stresses) were measured by a laser Doppler velocimeter (LDV). According to the configurations examined experimentally, numerical CFD-calculations also have been performed. To increase the accuracy of the numerical calculations for problems with simultaneous laminar and turbulent flow regimes, an empirical procedure is proposed.
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© 1999 Springer Science+Business Media Dordrecht
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Tauscher, R., Mayinger, F. (1999). Heat Transfer Enhancement in a Plate Heat Exchanger with RIB-Roughened Surfaces. In: Kakaç, S., Bergles, A.E., Mayinger, F., Yüncü, H. (eds) Heat Transfer Enhancement of Heat Exchangers. Nato ASI Series, vol 355. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9159-1_12
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DOI: https://doi.org/10.1007/978-94-015-9159-1_12
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