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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Effect of Sand Fouling on Compact Fin Heat Exchangers

Get access (open in a dialog) DOI: 10.1615/IHTC15.hex.008503
pages 3513-3526

摘要

Current pan-industry trends in technology development have resulted in the need for more compact heat exchangers with high effectiveness and at reduced size, weight, and pumping power requirements (SwAP). In most cases this has resulted in higher fin density and narrower fluid passages, thus substantially increasing the potential for fouling. In applications where compact heat exchangers are exposed to harsh environmental conditions, such as those designed for field use in desert climates, certain military field use, and off-road conditions, contamination fouling is of particular concern. While in the past there has been considerable research studying contamination fouling on liquid heat exchangers, the research related to particulate fouling on air-side heat exchangers has remained limited; therefore, the available data are generally inadequate. The issue of particulate fouling has been aggravated in recent years due to the need for systems to operate in harsh environments. The current study focuses on sand fouling in air cooled, highly compact heat exchangers. The driving variable that was measured during the sand fouling process was the differential pressure drop across the heat exchanger. Five samples were tested with fin counts of 31, 38, 47, 18, and 28 fins per inch (FPI). Tests were run based on MIL-Std-810E standard-specified duration, and results are reported for parametric variation of the velocity, sand concentration, test sample geometry, fin density, and humidity levels that collectively characterized the fouling phenomenon. It was found that test sample number 4, 18 FPI, had an overall better performance among the five samples.