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ACRC Technical Report 190PDF


Title:Fin-Tube Junction Effects on Flow and Heat Transfer in Flat Tube Corrugated Multilouvered Heat Exchangers
Author(s):Tafti, D.K.; Cui, J.
Subject(s):augmented louver geometries
air-side heat transfer enhancement
Abstract:Three-dimensional simulations of four louver-tube junction geometries are performed to investigate the effect on louver and tube friction and heat transfer characteristics. Three Reynolds numbers, 300, 600 and 1100, based on bulk velocity and louver pitch are calculated. Strong three-dimensionality exists in the flow structure in the region where the angled louver transitions to a flat landing adjoining the tube surface, whereas the flow on the angled louver far from the tube surface is essentially two-dimensional. Due to the small spatial extent of the transition region, its overall impact on louver heat transfer is limited, but the strong flow acceleration on the louver top surface augments the heat transfer coefficient on the tube surface by over 50%. In spite of the augmentation, the presence of the tube lowers the overall Nusselt number of the heat exchanger by over 30 %. Comparisons with correlations derived from experiments on full heat exchanger cores show that computational modeling of a small subsystem can be used reliably to extract performance data for the full heat exchanger.
Issue Date:2002-01
Publisher:Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Air Conditioning and Refrigeration Center TR-190
Genre:Technical Report
Sponsor:Air Conditioning and Refrigeration Project 114
Date Available in IDEALS:2009-06-04

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