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contributor authorKlaus Helbig
contributor authorRalph Nasarek
contributor authorTatiana Gambaryan-Roisman
contributor authorPeter Stephan
date accessioned2017-05-09T00:33:57Z
date available2017-05-09T00:33:57Z
date copyrightJanuary, 2009
date issued2009
identifier issn0022-1481
identifier otherJHTRAO-27853#011601_1.pdf
identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/141142
description abstractFalling liquid films are used in many industrial apparatuses. In many cases the film flow along a wall with topography is considered advantageous for intensification of the heat and mass transport. One of the promising types of the wall topography for the heat transfer intensification is comprised of minigrooves aligned along the main flow direction. The wall topography affects the development of wavy patterns on the liquid-gas interface. Linear stability analysis of the falling film flow based on the long-wave theory predicts that longitudinal grooves lead to the decrease in the disturbance growth rate and therefore stabilize the film. The linear stability analysis also predicts that the frequency of the fastest growing disturbance mode and the wave propagation velocity decrease on a wall with longitudinal minigrooves in comparison with a smooth wall. In the present work the effect of the longitudinal minigrooves on the falling film flow is studied experimentally. We use the shadow method and the confocal chromatic sensoring technique to study the wavy structure of falling films on smooth walls and on walls with longitudinal minigrooves. The measured film thickness profiles are used to quantify the effect of the wall topography on wave characteristics. The experimental results confirm the theoretical predictions.
publisherThe American Society of Mechanical Engineers (ASME)
titleEffect of Longitudinal Minigrooves on Flow Stability and Wave Characteristics of Falling Liquid Films
typeJournal Paper
journal volume131
journal issue1
journal titleJournal of Heat Transfer
identifier doi10.1115/1.2993539
journal fristpage11601
identifier eissn1528-8943
keywordsStability
keywordsWaves
keywordsFilm thickness
keywordsFlow (Dynamics)
keywordsLiquid films
keywordsShades and shadows AND Wave propagation
treeJournal of Heat Transfer:;2009:;volume( 131 ):;issue: 001
contenttypeFulltext


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