Abstract
A gate valve is one of the main elements of a circular pipeline, but the flow characteristics around the gate valve are hardly known. In this study, clarification of the flow field in front of the gate valve model in a pipe flow via flow visualization and PIV analysis was attempted. As a result, four kinds of steady necklace-type vortex systems, 2-vortex, 4-vortex, 6-vortex and 8-vortex systems, were clearly observed in a Reynolds number between 290 and 2130. In addition, the main vortex was observed in the Reynolds number range between 2130 and 4870 with difficulty. On this account, both the center position and vorticity in the main vortex are presented against Reynolds number.
Highlights
A gate valve has a feature that the pressure loss when fully opened is small and the valve opening degree can be finely adjusted
Yamada et al (2015) investigated flow field and loss coefficient produced by a gate valve model installed in a circular pipe [5]
Various vortex systems to be similar with the necklace vortex systems shown by Nakahara and Yamada [8] were confirmed upstream of the gate valve model in this experiment
Summary
A gate valve has a feature that the pressure loss when fully opened is small and the valve opening degree can be finely adjusted. Koram and Sparrow (1978) and Sparrow et al (1980) reported heat transfer and pressure drop characteristics induced by an unsymmetric blockage element installed into the circular pipe [1] [2]. Yamada et al (2015) investigated flow field and loss coefficient produced by a gate valve model installed in a circular pipe [5]. They first showed that one necklace-type vortex is formed in front and moves over the gate valve. Excluding the study by Yamada et al, the flow field in front of the protrusion has hardly been investigated [5]. In this paper the feature of the necklace-type vortex (vortex system, vortex position, and vorticity) was investigated by flow visualization and PIV analysis against a wide Reynolds number
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
