NDLI: Falling Films in Micro- and Minigrooves: Heat Transfer and Flow Stability

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gambaryan-Roisman, Tatiana Stephan, Peter
Copyright Year	2003
Abstract	Structured (in particular, micro- and minigrooved) wall surfaces may improve numerous industrial processes, including falling film evaporation, thin film evaporation in lean premixed prevaporized combustion technology (LPP), and spray and jet cooling. The advantages of such surfaces include the promotion of ultra-thin film evaporation at the apparent contact lines and the prevention of dry patches on hot surfaces. However, the behavior of thin film flow on structured surfaces has not yet been comprehensively studied. We derive a model describing the heat transfer in liquid film flowing down inclined micro- or minigrooved walls. The derived model accounts for peculiarities of the evaporation process in the vicinity of the liquid-vapor-solid contact line (“micro region”) and their effect on the overall heat transfer rate. It is shown that the effect of the micro region is to increase the overall heat transfer rate at the constant fluid flow rate. A long-wave stability analysis has been performed to quantify the effect of the capillary structure on the film stability properties. Sinusoidal and triangular longitudinal groove shapes have been considered. Two cases have been studied: (i) the film completely covers the wall structure; (ii) the film partly covers the wall structure. It is shown that the longitudinal grooves completely covered by the liquid have a stabilizing effect on the falling film flow. The performed analysis is a step towards modeling the wavy motion of the liquid film on grooved surfaces.
Sponsorship	Nanotechnology Institute
Starting Page	449
Ending Page	456
Page Count	8
File Format	PDF
ISBN	0791836673
DOI	10.1115/ICMM2003-1054
Volume Number	1st International Conference on Microchannels and Minichannels
Conference Proceedings	ASME 2003 1st International Conference on Microchannels and Minichannels
Language	English
Publisher Date	2003-04-24
Publisher Place	Rochester, New York, USA
Access Restriction	Subscribed
Subject Keyword	Stability Cooling Fluid dynamics Sprays Vapors Evaporation Flow (dynamics) Modeling Waves Film flow Thin films Liquid films Shapes Combustion technologies Heat transfer
Content Type	Text
Resource Type	Article

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