Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency

Wave-shaped vanes are widely used in various power and energy systems for improved efficiency and prevention of droplet erosion. The vanes consist of wave-shaped parallel plates with pockets. As wet steam flows through the wave-shaped path, heavier droplets are thrown to the outside and captured in...

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Autores principales:	Yoshihiro ISHIKAWA, Ryoma FUJIHARA, Shinji KUBO, Chikako IWAKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2017
Materias:	moisture separation microdroplet droplet enlargement wire mesh pressure loss Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/29e7669203004f829d6252ef6906c610
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spelling	oai:doaj.org-article:29e7669203004f829d6252ef6906c6102021-11-26T07:12:45ZStudy on microdroplet diameter enlargement for enhancement of moisture separation efficiency2187-974510.1299/mej.17-00287https://doaj.org/article/29e7669203004f829d6252ef6906c6102017-11-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/4/6/4_17-00287/_pdf/-char/enhttps://doaj.org/toc/2187-9745Wave-shaped vanes are widely used in various power and energy systems for improved efficiency and prevention of droplet erosion. The vanes consist of wave-shaped parallel plates with pockets. As wet steam flows through the wave-shaped path, heavier droplets are thrown to the outside and captured in the pockets while frequently changing direction. However, microscale droplets are difficult to completely catch since they flow straight with the steam and are carried over through the wave-shaped vanes. Accordingly, we previously investigated installing a wire mesh at the inlet of the wave-shaped vanes to enhance the droplet capture efficiency by enlarging the microdroplets. In the present study, we examined the effect of the wire mesh configuration on enlarging the microdroplet size through air-water experiments. Droplet diameters were measured by a real-time image processing system consisting of a CCD camera and pulsed laser light source. The results showed that the droplet diameter distribution largely depended on the wire mesh configuration. We evaluated the mass flow ratio for droplets with a diameter smaller than the threshold diameter. The ratio was smallest in the case of the six-layer configuration of 0.65 mm diameter compared with two other cases, 0.19 and 0.80 mm, whereas the pressure loss was largest in the case of 0.19 mm. We conducted flow visualization at the outlet of the wire mesh using a high-speed camera. The visualization results showed that a liquid film had formed over the layered wire mesh and the surface wave of the liquid film on the last layer induced the detachment of enlarged droplets from the liquid film.Yoshihiro ISHIKAWARyoma FUJIHARAShinji KUBOChikako IWAKIThe Japan Society of Mechanical Engineersarticlemoisture separationmicrodropletdroplet enlargementwire meshpressure lossMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 4, Iss 6, Pp 17-00287-17-00287 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	moisture separation microdroplet droplet enlargement wire mesh pressure loss Mechanical engineering and machinery TJ1-1570
spellingShingle	moisture separation microdroplet droplet enlargement wire mesh pressure loss Mechanical engineering and machinery TJ1-1570 Yoshihiro ISHIKAWA Ryoma FUJIHARA Shinji KUBO Chikako IWAKI Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency
description	Wave-shaped vanes are widely used in various power and energy systems for improved efficiency and prevention of droplet erosion. The vanes consist of wave-shaped parallel plates with pockets. As wet steam flows through the wave-shaped path, heavier droplets are thrown to the outside and captured in the pockets while frequently changing direction. However, microscale droplets are difficult to completely catch since they flow straight with the steam and are carried over through the wave-shaped vanes. Accordingly, we previously investigated installing a wire mesh at the inlet of the wave-shaped vanes to enhance the droplet capture efficiency by enlarging the microdroplets. In the present study, we examined the effect of the wire mesh configuration on enlarging the microdroplet size through air-water experiments. Droplet diameters were measured by a real-time image processing system consisting of a CCD camera and pulsed laser light source. The results showed that the droplet diameter distribution largely depended on the wire mesh configuration. We evaluated the mass flow ratio for droplets with a diameter smaller than the threshold diameter. The ratio was smallest in the case of the six-layer configuration of 0.65 mm diameter compared with two other cases, 0.19 and 0.80 mm, whereas the pressure loss was largest in the case of 0.19 mm. We conducted flow visualization at the outlet of the wire mesh using a high-speed camera. The visualization results showed that a liquid film had formed over the layered wire mesh and the surface wave of the liquid film on the last layer induced the detachment of enlarged droplets from the liquid film.
format	article
author	Yoshihiro ISHIKAWA Ryoma FUJIHARA Shinji KUBO Chikako IWAKI
author_facet	Yoshihiro ISHIKAWA Ryoma FUJIHARA Shinji KUBO Chikako IWAKI
author_sort	Yoshihiro ISHIKAWA
title	Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency
title_short	Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency
title_full	Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency
title_fullStr	Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency
title_full_unstemmed	Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency
title_sort	study on microdroplet diameter enlargement for enhancement of moisture separation efficiency
publisher	The Japan Society of Mechanical Engineers
publishDate	2017
url	https://doaj.org/article/29e7669203004f829d6252ef6906c610
work_keys_str_mv	AT yoshihiroishikawa studyonmicrodropletdiameterenlargementforenhancementofmoistureseparationefficiency AT ryomafujihara studyonmicrodropletdiameterenlargementforenhancementofmoistureseparationefficiency AT shinjikubo studyonmicrodropletdiameterenlargementforenhancementofmoistureseparationefficiency AT chikakoiwaki studyonmicrodropletdiameterenlargementforenhancementofmoistureseparationefficiency
_version_	1718409707556700160

Study on microdroplet diameter enlargement for enhancement of moisture separation efficiency

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