Library Subscription: Guest

ISSN Online: 2377-424X

ISBN Print: 1-56032-797-9

International Heat Transfer Conference 11
August, 23-28, 1998, Kyongju, Korea

APPLICATIONS OF NUMERICAL FLOW MODELLING TO HIGH-PERFORMANCE HEAT TRANSFER SURFACES

Get access (open in a dialog) DOI: 10.1615/IHTC11.1920
pages 333-338

Abstract

Numerical models are presented for flow and heat transfer over louvred-fm and plain, perforated and slit corrugated fin heat transfer surfaces. 2-D and 3-D models are applied to louvred fins in compact heat exchangers, and it is shown that accurate computations of overall heat transfer can only be achieved by using 3-D models which incorporate the effects of tube surface area and fin resistance. 2-D models based on the assumption of uniform fin temperature are shown to overpredict the heat transfer considerably.
The flow and heat transfer over corrugated fins are computed at Reynolds numbers typical of charge-air cooler internal fins. Accurate predictions of flow and heat transfer are presented for the laminar-flow regime, but it is shown that the high-Re k-ε model with log-law wall functions gives poor predictions of heat transfer for the turbulent-flow regime, and it is suggested that low-Re forms of the model would be more accurate in this regime.