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http://bura.brunel.ac.uk/handle/2438/6368
Title: | One-dimensional semimechanistic model for flow boiling pressure drop in small to micro passages |
Authors: | Shiferaw, D Mahmoud, M Karayiannis, TG Kenning, DBR |
Keywords: | Two phase;Pressure drop;Flow boiling;Small diameter tube |
Issue Date: | 2011 |
Publisher: | Taylor and Francis |
Citation: | Heat Transfer Engineering 32(13-14): 1150-1159, Mar 2011 |
Abstract: | Accurate predictions of two-phase pressure drop in small to micro diameter passages are necessary for the design of compact and ultra-compact heat exchangers which find wide application in process and refrigeration industries and in cooling of electronics. A semi-mechanistic model of boiling two-phase pressure drop in the confined bubble regime is formulated, following the three-zone approach for heat transfer. The total pressure drop is calculated by time-averaging the pressure drops for single-phase liquid, elongated bubble with a thin liquid film and single-phase vapour. The model results were compared with experimental data collected for a wide range of diameter tubes (4.26, 2.88, 2.02, 1.1 and 0.52 mm) for R134a at pressures of 6 – 12 bar. In its present form, the predictions of the model are close to those of the homogeneous flow model but it provides a platform for further development. |
Description: | Copyright @ 2011 Taylor and Francis Group. |
URI: | http://www.tandfonline.com/doi/abs/10.1080/01457632.2011.562726 http://bura.brunel.ac.uk/handle/2438/6368 |
DOI: | http://dx.doi.org/10.1080/01457632.2011.562726 |
ISSN: | 0145-7632 |
Appears in Collections: | Mechanical and Aerospace Engineering Dept of Mechanical and Aerospace Engineering Research Papers |
Files in This Item:
File | Description | Size | Format | |
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Fulltext.doc | 2.01 MB | Microsoft Word | View/Open |
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