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Title: Flow Boiling in Mini to Micro Diameter Channels
Authors: Karayiannis, T
Mahmoud, MM
Issue Date: 2018
Publisher: World Scientific Publishers
Citation: In: Thome, JR (ed), "Encyclopedia of Two-Phase Heat Transfer And Flow III", 2018
Abstract: Flow boiling in mini to micro passages is a current research area pursued in a number of laboratories. However, a review of past literature indicates that there are discrepancies and disagreements in the published results on the prevailing flow patterns, heat transfer rates and pressure drop in such geometries. In this chapter we review and present new research on the effect of five different parameters or factors on the above. These parameters are summarized as follows: (1) The channel inner surface finish. (2) Channel heated length. (3) Channel material. (4) Fluid properties. (5) And finally, a discussion is included on the more recent trends in research, i.e. the use of surface nano coating. The coating differs from the surface finish in that the coating achieves nearly controlled and uniformly distributed microstructure over the heat transfer surface, while surface finish results in a random micro structure. The chapter starts with a brief review of bubble nucleation and dynamics in macro and micro channels in order to quantify the effect of surface microstructure and fluid properties. It continues with a description of the experimental facility and data reduction followed by a presentation and discussion of the effects of each of the above parameters in a separate section. A detailed discussion on fundamental phenomena is included and related to flow patterns, heat transfer characteristics and pressure drop results. Final conclusions and recommendation are then given.
ISBN: 978-981-3227-31-6
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Embargoed Research Papers

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