Jin-yuan Qian

Jin-yuan Qian
Zhejiang University | ZJU · Institute of Process Equipment

Professor (Associate)

About

108
Publications
25,312
Reads
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1,274
Citations
Citations since 2016
100 Research Items
1253 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Introduction
Jin-yuan Qian is an Associate Professor in Institute of Process Equipment, College of Energy Engineering, Zhejiang University currently. His research interests include Computational Fluid Dynamics, Heat Transfer, Flow Control and applications in Heat Exchangers and Valve etc.
Additional affiliations
December 2017 - August 2021
Zhejiang University
Position
  • Professor (Associate)
August 2016 - November 2017
Lund University
Position
  • PostDoc Position
January 2016 - February 2016
University of Leeds
Position
  • Researcher
Education
August 2011 - June 2016
Zhejiang University
Field of study
  • Institute of Process Equipment
August 2007 - July 2011
Zhejiang University
Field of study
  • Mixed Class, Chu Kochen Honors College

Publications

Publications (108)
Article
Full-text available
Liquid–liquid two-phase flow in microchannel is very common in micro-chemical and micro-biological system, etc. Deep understanding of the liquid–liquid two-phase flow mechanisms and mass transfer in microchannel can promote industrial applications significantly. To summarize the recent research progress on the liquid–liquid two-phase flow in microc...
Article
Steam flow is the main form for energy transfer in power plants, process industries, etc. The flow rate of the steam relates to the energy transfer amount directly. Pressure reducing valves are used for flow rate control of the compressible superheated steam in these piping systems. In this paper, a pressure reducing valve with a novel valve core i...
Article
Full-text available
In this study, Al2O3-water nanofluids flowing through a micro-scale T45-R type Tesla valve was investigated numerically. Both forward and reverse flows were investigated based on a verified numerical model. The effects of nanofluids flow rate, temperature, and nanoparticle volume fraction on fluid separation in the bifurcated section and the pressu...
Article
Full-text available
Valves are widely used in various working conditions for their flow control functions, and the cavitation inside valves has been investigated owing to its harm to the valve itself and the connecting downstream parts. This paper presents a comprehensive review of the progress that has been achieved in the past years about cavitation in valves includ...
Article
As a key device affecting the safety and economy of the pipeline system of nuclear power plants, the control valve regulates the medium pressure and flow rate. In this paper, taking the sleeve control valve as the research object, lift coefficient of flow field and vibration analysis of valve stem and plug are conducted with fluid–structure interac...
Conference Paper
As the key device of the secondary circuit system, the main feed water regulating valve plays a significant role in controlling water level, whose reliability directly affects the safety of the nuclear power plant. During the use of the main feed water regulating valve, the movement and stress state of the valve core are affected by the hydraulic f...
Article
In this investigation, thermal performance characteristics of passive solar water heater with vacuum tube were experimentally studied by using the mixture of wet gas and liquid water. Five different outlet locations of the tank were used to produce five different proportions of wet gas-liquid water mixtures. Experimental results were proposed in th...
Article
In this study, droplet characteristics including droplet length and formation time, and mixing efficiency in droplets were investigated via the volume of fluid (VOF) method coupled with a user defined scalar (UDS) model. A cross-shaped junction with a square cross-section was designed and used for droplet formation. An initial arrangement which dif...
Article
Sleeve regulating valve is the key component in the industrial system. As the main cause of vibration and noise inside the sleeve regulating valve, cavitation also increases the energy loss when the fluid flows through the valve. In this paper, in order to quantitatively analyze the influence of cavitation in the sleeve regulating valve, the effect...
Conference Paper
The serious aerodynamic noise is caused in the downstream of control valve by high pressure difference. Severe aerodynamic noise will affect worker safety and production safety. Throttling orifice plate located in control valve downstream is one of the most important devices for reducing aerodynamic noise under high pressure difference. Therefore,...
Conference Paper
Hydraulic valve is used as an important hydraulic component, playing a vital role in fluid power transmission and control systems. When the phenomenon of sticking of valve core occurs, it may seriously decrease the accuracy and sensitivity of the hydraulic valve. Micro-deformation is one of the most common faults causing the valve core sticking, wh...
Conference Paper
The utilization of V-spirally corrugated tubes has attracted the attention of many researchers recently. As typical enhancement techniques of heat transfer, they combined the merits of roughness, turbulators and enhanced surface. This paper mainly studies the influence of depth ratio (DR = 0.039–0.199), pitch ratio (PR = 2.37–4.77), and various num...
Article
Full-text available
The Main Steam Valve Set (MSVS) is the key protection equipment for nuclear power plants, whose dynamic characteristics are directly related to the security of the secondary circuit system under overpressure conditions. Dynamic mesh technology is used in this work to capture the dynamic characteristics of the interconnected pilot valves on the MSVS...
Article
The steam trap valve is used in thermal power systems to pour out condensate water and keep steam inside. While flowing through steam trap valves, the condensate water can easily reach cavitation, which may cause serious damage to the piping system. In this paper, in order to control cavitation inside steam trap valves, effects of sleeve parameters...
Article
Two-stage sleeve control valve has been widely implemented in high-pressure difference hydraulic system, whose function is to reduce hydrodynamic noise. The sleeve with orifices plays a significant role in reducing the hydrodynamic noise. The ratio of orifices diameter between outer sleeve and inner sleeve, Ri is investigated in this paper. The cou...
Article
As a key device influencing the safety and the economy of nuclear power plants simultaneously, the main feed water regulating valve (MFWRV) controls the flow rate flowing to the steam generator. In this work, modal and structural analysis is conducted under different loading conditions to investigate vibration characteristics and mechanical charact...
Article
s Feed-water valves (FWVs) are used to regulate the flow rate of water entering steam generators, which are very important devices in nuclear power plants. Due to the working environment of relatively high pressure and temperature, there is strength failure problem of valve body in some cases. Based on the thermo-fluid-solid coupling model, the val...
Conference Paper
The check valve is one of the most important devices for safety protection of the piping system in thermal and nuclear power plants. As the key component of the check valve, the valve disc accounts for a major effect on the flow characteristics especially during the opening and closing processes. In this paper, a typical swing check valve is taken...
Conference Paper
LNG (liquefied natural gas) cryogenic ball valve (CBV) is an important flow control device in LNG receiving stations. Its reliability directly affects the stability of the pipeline system, especially its damage or leak in the seat seal will seriously threaten the normal operation and the safety of LNG receiving stations. When LNG flows through the...
Article
Full-text available
Closed circuit axial piston transmission (CCAPT) has been implemented in the field of hydraulic transmission. As a result of frictional loss and leakage loss, the temperature rise is unavoidable, that can shorten the service life of crucial components. Based on the method of computational fluid dynamics and liquid-solid mathematical coupling, struc...
Article
In this paper, the piston type valve core and the unbalanced moment on its bottom are studied. To decrease the influence of non-common geometrical factors, a simplified model of the piston type globe valve is proposed in this study. Based on the computational fluid dynamics (CFD) method, the effects of different geometrical parameters on the unbala...
Article
Cryogenic ball valves are one of the most important fluid control devices in liquefied natural gas (LNG) receiving stations. The dynamic flow characteristics of cryogenic ball valves directly affect the stability of a pipeline system. In this paper, the sliding mesh technology was adopted to simulate the dynamic flow characteristics of the cryogeni...
Article
Full-text available
Realizing conversion between fluid power and mechanical energy, the closed circuit axial piston transmission (CCAPT) plays a vital and indispensable role in miscellaneous industries. The frictional loss and leakage loss inside the system give rise to the inevitable temperature rise. In order to prolong the life of the device, a cooling structure on...
Article
A novel hybrid smooth and spirally corrugated tube is introduced in this article, which is the combination of smooth part and corrugated part. With the help of the finite volume method, a better understanding of the mechanism for heat transfer enhancement can be obtained. A qualitative and quantitative analysis about the effect of geometrical param...
Article
Ambient condition, especially the wind condition, is an important factor to determine the behavior of hydrogen diffusion during hydrogen release. However, only few studies aim at the quantitative study of the hydrogen diffusion in a wind-exist condition. And very little researches aiming at the variable wind condition have been done. In this paper,...
Article
Full-text available
In this paper, the effect of membrane features on flow characteristics in the microfluidic passive valve (MPV) and the membrane behavior against fluid flow are studied using the fluid-structure interaction (FSI) analysis. Firstly, the microvalve model with different numbers of microholes and pitches of microholes are designed to investigate the flo...
Article
Purpose: Mechanical heart valves (MHVs) are widely used to replace diseased heart valves, but it may suffer from cavitation due to the rapid closing velocity of the leaflets, resulting in the damage of red blood cells and platelets. The aim of this study is to apply computational fluid dynamics (CFD) method to investigate the cavitation in bileafl...
Article
Spirally corrugated tubes are widely used in thermal engineering, such as airconditionings and heat pumps due to their advantages like extended surfaces for heat transfer enhancement and easy fabrication with low economic costs. In this paper, the numerical simulation is carried out to analyze the thermohydraulic performances of multi-start spirall...
Conference Paper
The sleeve regulating valve is a typical flow regulating component, which is indispensable in various industrial applications. This work investigates the effects of the body structure on the overall performance and the flow characteristic of a sleeve regulating valve. The anterior cavity h, the diameter of the center cavity Dc, and the eccentricity...
Article
Compared to conventional globe valves, the pilot-control globe valve (PCGV) possesses advantages of lower energy consumption and higher space utilization. In order to analyze the effects of pilot pipe and damping orifice arrangements, this work proposes four PCGVs and conducts simulations to compare their overall performances, overall flow characte...
Article
Risk analysis and consequence assessment aimed at the hydrogen refueling station are of great importance for the large-scale commercialization of the hydrogen refueling station. In this paper, the unintended hydrogen release in both momentum-buoyancy dominated regime and momentum dominated regime is investigated numerically. The profile of the flam...
Article
Full-text available
Smart control processes have been proposed for many years, while for smart flow control—especially when “smart flow control” comes at the microscale—it turns out that many new innovations and enabling technologies are possible [...]
Article
Feed-water valves are widely used in nuclear power plants to regulate the flow rate of the water supplying to steam generators and thus hold the water level in steam generators at desired value. The flow rate characteristics of feed-water valves have important effects on the management quality of the water level in steam generators and therefore in...
Article
Full-text available
Steam is a common medium in thermal engineering. When it flows through a throttling element, the aerodynamic noise may occur due to the disturbance. In this investigation, superheated steam flowing through a Venturi tube, one of the main parts in a temperature and pressure regulation valve, at different thermal conditions is studied to analyze to e...
Article
Full-text available
A mechanical heart valve (MHV) is an effective device to cure heart disease, which has the advantage of long life and high reliability. Due to the hemodynamic characteristics of blood, mechanical heart valves can lead to potential complications such as hemolysis, which have damage to the blood elements and thrombosis. In this paper, flowing feature...
Article
Spring linked two-stage perforated plate (STP) is a novel industrial component, which can be used for pressure stabilization in piping systems. In this paper, dynamic flow characteristics of STP with different holes arrangements are investigated with transient numerical methods by moving grids technology and User-Defined Function (UDF). The reliabi...
Article
Studies focused on the behavior of the hydrogen leakage and diffusion are of great importance for facilitating the large scale application of the hydrogen energy. In this paper, the hydrogen leakage and diffusion in six scenarios which including comparison of different leakage position and different wind effect are analyzed numerically. The studied...
Article
Full-text available
Control valves are widely used to regulate fluid flux in nuclear power plant, and there are more than 1500 control valves in the primary circuit of the nuclear power plant. With their help, the flux can be regulated to a specific level of water or steam to guarantee the energy efficiency and safety of nuclear power plant. The flux characteristics o...
Article
Full-text available
A heat exchanger is a device that transfers unneeded heat from one region to another, and transferred heat may be fully reused, thus improving energy efficiency. To augment this positive process, many studies and investigations on automation technologies have been performed. Inserts are widely used in pipe flow for heat transfer enhancement, since...
Article
Cavitation occurring in a sleeve regulating valve not only increases the energy waste of the whole piping system but also causes severe and costly damage to the valve body and the piping system. In this paper, in order to reduce the cavitation inside the sleeve regulating valve, the effects of different valve core shapes, including flat bottom, ell...
Article
Due to the merits of higher heat transfer efficiency, spirally corrugated tubes are widely used in a range of applications for heat transfer enhancement, especially in coaxial heat exchangers. This paper studied a novel hybrid smooth and six-start spirally corrugated tube and focused on its heat transfer performance as well as its pressure drop. Fi...
Article
Full-text available
The injection flow rates of two liquid phases play a decisive role in the slug generation of the liquid-liquid slug flow. However, most injection flow rates so far have been constant. In order to investigate the effects of dynamic injection flow rates on the slug generation, including the slug size, separation distance and slug generation cycle tim...
Article
Fouling on heat exchanger surfaces can weaken the heat-transfer capability, increase the energy consumption, and even cause the failure of the whole system. In coaxial heat exchangers, spirally corrugated tubes perform better than smooth ones concerning heat transfer and antifouling. In this article, a parametric study on the antifouling performanc...
Article
Superheated steam is the main medium in the piping system of steam power plants. In these pipelines, perforated plates are widely used to regulate the flow rate, pressure, and also reduce aerodynamics noise of steam. For the superheated steam flow, the flow resistance and aerodynamic noise are two key parameters of the perforated plates. In order t...
Article
Purpose The purpose of this paper is to study the effects of dimple geometries and arrangements on the heat transfer enhancement in a dimple jacketed heat exchanger. Design/methodology/approach For the purpose of this paper, with the experimental validated numerical model, this paper carries out numerical simulations of both single dimples with di...
Conference Paper
Piston type valve cores are widely adopted in check valves, globe valves, pressure reducing valves and so forth. With the irregular inlet flow channel, the bottom of piston type valve core exits unbalanced torques usually. The unbalanced torque causes the valve core to squeeze sealing elements and increases the energy consumption. To analyze the un...
Conference Paper
Steam trap valves are mainly used in thermal power systems to pour out condensate water and keep steam inside. While during the condensate water flowing through steam trap valves, the condensate water is easy to reaching cavitation, which may cause serious damage to the piping system. In order to reducing the cavitation occupation in steam trap val...
Article
When fluids flow in microchannels, due to the relative low hydraulic diameter and low flow velocity, the flow is usually laminar flow, which hinders the effective mixing between two liquid-liquid phases. In this paper, the mixing efficiency at both droplet forming stage and droplet moving stage are investigated with the volume of fluid (VOF) method...
Article
Multi-stage Tesla valves in the reversed flow state can be applied during the hydrogen decompression process between the high pressure hydrogen storage vessel and the fuel cell. Under high-pressure turbulent hydrogen flow, severe aerodynamic noise may be caused and large energy loss inside Tesla valves may be generated, which can cause uncomfortabl...
Article
Slug flow is a common flow pattern in the liquid–liquid two-phase flow in microchannels. It is an ideal pattern for mass transfer enhancement. Many factors influence the slug formation such as the channel geometries (channel widths, channel depth), flow rates of the two phase, and physical properties. In this paper, in order to investigate the liqu...
Article
The pilot operated proportional directional valves (POPDVs) with a flow rate ranging from 100 to 1000 L/min are widely used in electro-hydraulic systems (EHSs). The deadzone of the pilot stage valve and its control compensation could significantly affect the position control performance for the main stage valve that could directly affect dynamics o...
Article
Hydrogen fuel cell is an ideal power source for electric vehicles. For a hydrogen fuel cell electric vehicle, the hydrogen is reserved in a high pressure level to promote the recharge mileage while relatively low-pressure hydrogen is demanded for proper functioning of the fuel cell stack, so that decompression of hydrogen is needed before hydrogen...
Article
Full-text available
Microfluidic systems have witnessed rapid development in recent years. As one of the most common structures, the micro-orifice is always included inside microfluidic systems. Hydrodynamic cavitation in the micro-orifice has been experimentally discovered and is harmful to microfluidic systems. This paper investigates cavitating flow through a micro...
Article
Full-text available
目 的 目前大中型控制阀大多存在结构复杂、 驱动能耗大、 反应时间慢、 振动噪声大、 稳定性差和使用寿命短等缺点。 基于此, 浙江大学相关研究人员组建了特种控制阀研究室, 致力于提升控制阀的整体性能和设计水平。 研究点 本研究室的主要方向为: • 1. 控制阀内部流动特性分析和新结构设计开发; • 2. 流体目标流量、 温度、 压力和振动噪声等的智能控制研究; • 3. 适应纳米流体、 压缩氢气和高温高压过热蒸汽等新流体介质的智慧控制阀研究。 展 望 特种控制阀作为超超临界火电机组、 核电、 石化高压反应和百万吨级乙烯工程等国家重大重点工程的关键零部件之一, 将会在内流动机理、 新结构开发、 新流体介质和智能控制等研究领域得到广泛关注和长足发展。
Article
In order to comprehensively understand the specific noise generation process inside pressure reducing valves (PRV) and its existing research outcomes, the generation of noise in PRV with its research methods in China and abroad was summarized. Then, the current research status of noise reduction technologies was reviewed from two aspects: source an...
Article
Full-text available
Liquid–liquid two-phase flow in microchannels has attracted much attention, due to the superiority of mass transfer enhancement. One of the biggest unresolved challenges is the low mixing efficiency at the microscale. Suitable mixing efficiency is important to promote the mass transfer of two-phase flow in microchannels. In this paper, the mixing e...
Article
Full-text available
When liquids flow through a throttling element, the velocity increases and the pressure decreases. At this point, if the pressure is below the saturated vapor pressure of this liquid, the liquid will vaporize into small bubbles, causing hydraulic cavitation. In fact, a vaporization nucleus is another crucial condition for vaporizing, and particles...
Conference Paper
In a piping system, due to the sudden opening or closing of valves and pumps etc., pressure inside can be changed both rapidly and suddenly, which may cause water hammer, noise, vibration, and even damage the whole piping system seriously. Thus, to stabilize pressure in piping system under a target value is very important. In this paper, a novel pr...
Conference Paper
In the present study, water-oil flow patterns and slug hydrodynamics were experimentally studied in square glass microchannels with various hydraulic diameters (Dh = 600 μm, 400 μm, 200 μm). The aqueous phase is the continuous phase while the organic phase is the dispersed phase. The ranges of flow rates of the continuous phase and the dispersed ph...
Conference Paper
Hydropower stations play an important role in discharging the flood. Especially in wet seasons, the river water always contains several percentages of sediment, and the velocity of the water flowing through the flood discharging tunnel is very high. Arranging some energy dissipation orifice plates in the flood discharging tunnel, cannot only reduce...
Conference Paper
Full-text available
This work visualized water-silicone oil two-phase flow patterns both at the inlet cross-junction and in the main square microchannel with a channel width of 400 μm. Tubing/threading, dripping and jetting were identified at the inlet junction while annular, slug and droplet flows were categorized in the main microchannel at 50 mm downstream of the j...
Conference Paper
This work visualized water-silicone oil two-phase flow patterns both at the inlet cross-junction and in the main square microchannel with a channel width of 400 μm. Tubing/threading, dripping and jetting were identified at the inlet junction while annular, slug and droplet flows were categorized in the main microchannel at 50 mm downstream of the j...
Article
Micro-droplets with excellent physical properties and size effects are widely used in different fields. Peristaltic pumps are often used for droplet generation. The thrust force of pumps is periodic as a periodic disturbance when the time scale is short enough. Numerical simulation based on a validated model was applied to study the periodic distur...
Article
Heat transfer enhancement is of great importance for energy efficiency improvement. The utilization of spirally corrugated tubes is one of the efficient ways to strengthen heat transfer. In this article, based on a validated numerical model, the effects of geometric parameters of a six-start spirally corrugated tube, including the pitch p and the c...