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Frost Growth in Laminar Channel Flows with Streamwise Vortices

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PDF TR123.pdf (8MB) ACRC Technical Report 123 PDF
Title: Frost Growth in Laminar Channel Flows with Streamwise Vortices
Author(s): Storey, B.D.; Jacobi, A.M.
Subject(s): frost growth heat transfer surfaces
Abstract: An experimental study of frost growth under the influence of streamwise vortices in a laminar channel flow is presented. A new model of frost growth is developed to normalize the growth rate of frost with respect to the effects of environmental parameters and time. This normalization and a scale analysis show that the dimensionless frost thickness grows with the square root of environmental time, a single parameter capturing environmental and temporal effects. Experimental plain-channel data obey this relationship to within the uncertainty of the measurements. Also in agreement with the model, the data show no significant dependence on channel location or on Reynolds number (for 5OO<Re<2500 based on hydraulic diameter). Comparisons of model predictions to data from previous studies demonstrate good agreement with these independent data obtained under other conditions. The growth patterns of frost behind a delta-wing fixed to the surface of the channel are explained using flow visualization results. The appearance of frost on the surface occurs sooner, and the frost has an internal structure in regions where the vortices impose a flow toward the surface different from regions unaffected by vortices. Horseshoe vortices form at the junction of the channel and wing and the interaction of tip vortex and horseshoe vortex were qualitatively observed. The maximum frost height behind the delta wing in the spanwise direction is compared to the plain channel results: frost growth rate under the influence of the streamwise vortex was approximately 13% higher than for the plain-channel case.
Issue Date: 1997-07
Publisher: Air Conditioning and Refrigeration Center. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report: Air Conditioning and Refrigeration Center TR-123
Genre: Technical Report
Type: Text
Language: English
Sponsor: Air Conditioning and Refrigeration Project 58
Date Available in IDEALS: 2009-04-24
Identifier in Online Catalog: 4167298

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