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Applied Sciences
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Recent Advances in Flow Control
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Recent Advances in Flow Control

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Mechanical Engineering".

Deadline for manuscript submissions: closed (30 April 2022) | Viewed by 10140

Special Issue Editors

Prof. Dr. Liang Hu

E-Mail Website
Guest Editor
School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China
Interests: flow measurement; ultra-clean flow control; semiconductor equipment
Prof. Dr. Yao Jing

E-Mail Website
Guest Editor
School of Mechanical Engineering, Yanshan University, Qinhuangdao, 438, China
Interests: energy saving; lightweight; digital hydraulic

Special Issue Information

Dear Colleagues,

Flow control technology currently plays important roles in many areas, working in fluid power transmission approaches to drive and control machine motions, realizing fluid medium delivery for chemical reaction systems and energy networks, in microfluidic control for labs-on-chips, and providing fabrication processes for semiconductor manufacturing and bio-manufacturing, among others. Wider applications lead to new technical developments. In recent decades, new technologies have been developed to make flow control parts and systems more intelligent, energy saving, lightweight and flexible. Additionally, new technologies applicable to higher pressure and higher flow rate situations, extremely small micro-channels, ultra-clean fluid media, and with better biocompatibility have been extensively developed to support new applications. This Special Issue of Applied Sciences will consider papers that present new advances in flow control knowledge, technology, and research methodology.

Prof. Dr. Liang Hu
Prof. Dr. Yao Jing
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • flow control
  • pump
  • valve
  • cylinder
  • hydraulic motor
  • flow meter
  • intelligent
  • energy saving
  • lightweight
  • microfluidics
  • ultra-clean
  • biocompatibility

Published Papers (5 papers)

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Research

18 pages, 11687 KiB  
Article
Numerical Analysis of the Factors Influencing the Erosion of the Valve Port of a High-Speed On/Off Valve
by Yuzheng Li, Jintao Du, Yijun Lan, Heng Du and Hui Huang
Appl. Sci. 2022, 12(12), 6212; https://0-doi-org.brum.beds.ac.uk/10.3390/app12126212 - 18 Jun 2022
Cited by 3 | Viewed by 1509
Abstract
Aiming at the problem of valve port erosion caused by contaminated particles, a three-dimensional prediction model of valve orifice erosion was established based on computational fluid dynamics (CFD) and erosion theory, considering the influence of the valve port eddy current on the oil [...] Read more.
Aiming at the problem of valve port erosion caused by contaminated particles, a three-dimensional prediction model of valve orifice erosion was established based on computational fluid dynamics (CFD) and erosion theory, considering the influence of the valve port eddy current on the oil flow. The discrete phase model (DPM) of fluent is used to obtain the orifice erosion location and erosion rate, and the causes of erosion of the high-speed on/off valve are analyzed. On this basis, several factors influencing valve port erosion are simulated to investigate the relationship between particle collision behavior and valve port erosion morphology under different factors, and the change rule of valve port erosion under different factors is analyzed. The results show that the high-speed on/off valve service life decreases with a larger cone angle of the spool, a larger pressure difference at the valve port, a larger proportion of large particle contaminants in the oil, a higher oil contamination level, and a larger filter aperture. In addition, the grey relational analysis method is used to clarify the pressure difference at the valve port, the particle size, and the filter aperture as the three most important factors affecting the erosion of the valve port of a high-speed on/off valve. Full article
(This article belongs to the Special Issue Recent Advances in Flow Control)
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19 pages, 6831 KiB  
Article
Effects of the Damping Parameters on the Opening and Closing Characteristics of Vent Valves
by Jin Zhang, Wenlong Yin, Yandong Shi, Zitong Gao, Lijiang Pan and Ying Li
Appl. Sci. 2022, 12(10), 5169; https://0-doi-org.brum.beds.ac.uk/10.3390/app12105169 - 20 May 2022
Cited by 2 | Viewed by 1448
Abstract
The main function of the vent valve is to release part of the air at the outlet of the axial compressor to prevent engine surges. The damping parameters have an important effect on the opening and closing characteristics of the vent valve. The [...] Read more.
The main function of the vent valve is to release part of the air at the outlet of the axial compressor to prevent engine surges. The damping parameters have an important effect on the opening and closing characteristics of the vent valve. The control characteristics of each component were obtained by finite element analysis and testing. The overall model of a two-stage partial pressure vent valve was established, and the reliability of the model was verified by testing. The opening and closing characteristics of the damper valve with different damping parameters were obtained by parametric simulation. The results show that there was a pressure mutation point in the middle support pressure and the pressure in the control chamber during operation of the vent valve, which made the valve open and close quickly. The damping hole of the middle shell and the middle nozzle of the support had the greatest influence on the open-close pressure ratio. The damping hole and nozzle of the middle shell had the greatest influence on the opening and closing stability. The results are used to guide the structural design, and the analytical method provides a theoretical basis for research of the same type of valve. Full article
(This article belongs to the Special Issue Recent Advances in Flow Control)
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14 pages, 4777 KiB  
Article
Research on the Centrifugal Driving of a Water-in-Oil Droplet in a Microfluidic Chip with Spiral Microchannel
by Zhongqiang Xie, Yongchao Cai, Jiahao Wu, Zhaokun Xian and Hui You
Appl. Sci. 2022, 12(9), 4362; https://0-doi-org.brum.beds.ac.uk/10.3390/app12094362 - 26 Apr 2022
Viewed by 3188
Abstract
Combining the advantages of droplet-based microfluidics and centrifugal driving, a method for centrifugally driving W/O droplets with spiral microchannel is proposed in this paper. A physical model of droplet flow was established to study the flow characteristics of the W/O droplet in the [...] Read more.
Combining the advantages of droplet-based microfluidics and centrifugal driving, a method for centrifugally driving W/O droplets with spiral microchannel is proposed in this paper. A physical model of droplet flow was established to study the flow characteristics of the W/O droplet in the spiral microchannel driven by centrifugal force, and kinematic analysis was performed based on the rigid body assumption. Then, the theoretical formula of droplet flow rate was obtained. The theoretical value was compared with the actual value measured in the experiments. The result shows that the trend of the theoretical value is consistent with the measured value, and the theoretical value is slightly larger than the experimentally measured value caused by deformation. Moreover, it is found that the mode of centrifugal driving with spiral microchannel has better flow stability than the traditional centrifugal driving structure. A larger regulation speed range can be achieved by adjusting the motor speed without using expensive equipment or precise instruments. This study can provide a basis and theoretical reference for the development of droplet-based centrifugal microfluidic chips. Full article
(This article belongs to the Special Issue Recent Advances in Flow Control)
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Graphical abstract

18 pages, 4895 KiB  
Article
An Analysis of Bubble Migration in Horizontal Thermo-Capillarity Using the VOF Modeling
by Ranjith Kumar, Yu-Chen Lin, Chia-Wei Lin, Ming-Chieh Lin and Hua-Yi Hsu
Appl. Sci. 2022, 12(9), 4355; https://0-doi-org.brum.beds.ac.uk/10.3390/app12094355 - 25 Apr 2022
Cited by 3 | Viewed by 1381
Abstract
Due to various engineering applications, spontaneous bubble movement on the heated surface has brought huge attention. This work numerically studied the bubble migration driven by the thermo-capillary force under the temperature gradients perpendicular to the gravity direction. This problem is constructed in a [...] Read more.
Due to various engineering applications, spontaneous bubble movement on the heated surface has brought huge attention. This work numerically studied the bubble migration driven by the thermo-capillary force under the temperature gradients perpendicular to the gravity direction. This problem is constructed in a two-dimensional domain, and the volume of fluid (VOF) method is adopted to capture the properties of the bubble interface between the vapor and the liquid. One still vapor bubble is initially positioned at the center of the liquid domain, and the temperature gradient is applied to two side walls. The results show that the bubble with a size greater than the capillary length can only oscillate near the initial position even with a larger temperature gradient. The deformation of the bubble such as spheroid and spherical cap can be found around this regime. However, the movement of the bubble with a size smaller than the capillary length is significant under a higher temperature gradient, and it remains a spherical shape. The coefficient of thermo-capillary force (CTh) is defined within this work, and it is found that a larger Weber number (We) accomplishes a larger CTh. This work may provide more precise guidance for smart bubble manipulation and critical heat flux estimation for future nuclear reactor design. Full article
(This article belongs to the Special Issue Recent Advances in Flow Control)
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15 pages, 5984 KiB  
Article
Rapid-Erection Backstepping Tracking Control for Electrohydraulic Lifting Mechanisms of Launcher Systems
by Lan Li, Yi Jiang, Xiaowei Yang and Jianyong Yao
Appl. Sci. 2022, 12(2), 893; https://0-doi-org.brum.beds.ac.uk/10.3390/app12020893 - 16 Jan 2022
Cited by 1 | Viewed by 1389
Abstract
Uncertainties and disturbances widely exist in electrohydraulic lifting mechanisms of launcher systems, which may worsen the rapid-erection tracking accuracy and even make the system unstable. To deal with the issue, an asymptotic tracking control framework is developed for electrohydraulic lifting mechanisms of launcher [...] Read more.
Uncertainties and disturbances widely exist in electrohydraulic lifting mechanisms of launcher systems, which may worsen the rapid-erection tracking accuracy and even make the system unstable. To deal with the issue, an asymptotic tracking control framework is developed for electrohydraulic lifting mechanisms of launcher systems. Firstly, the dynamic equations and state-space forms of the electrohydraulic lifting mechanism are modeled. Based on the system model, a nonlinear rapid-erection robust controller is constructed to achieve the improvement of the system control performance, in which a nonlinear feedback term is employed to remove the effects of uncertainties and disturbances on tracking performance. Compared to the existing results, the asymptotic tracking stability of the closed-loop system can be assured based on the Lyapunov theory analysis. In the end, the simulation example of an actual electrohydraulic lifting mechanism of the launcher system is done to validate the effectiveness with the proposed controller. Full article
(This article belongs to the Special Issue Recent Advances in Flow Control)
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