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Qianfeng Liu

Bio: Qianfeng Liu is an academic researcher from Tsinghua University. The author has contributed to research in topics: Solenoid valve & Hydraulic drive system. The author has an hindex of 10, co-authored 50 publications receiving 288 citations. Previous affiliations of Qianfeng Liu include Chengdu University of Technology & Southwest Petroleum University.


Papers
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TL;DR: In this paper, a stochastic searching algorithm to find the collision droplet pairs is performed by utilizing the collision kernels and defining the mean free path of a droplet, and the criteria to distinguish the different regimes of binary droplet collision are carried out.

33 citations

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TL;DR: In this article, the numerical stability of solving the ODEs by using a fourth-order Runge-Kutta scheme is analyzed by a theoretical method in order to increase the time step size to save the computational time.

33 citations

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TL;DR: Based on the operation conditions of the Control Rod Hydraulic Drive System (CRHDM), the electromagnetic force of the direct action solenoid valve was analyzed by experiment and numerical method as mentioned in this paper.

33 citations

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TL;DR: In this article, the authors simulated droplet-laden flows in cyclone and swirl-vane separators based on Lagranian-Eulerian approach, where the actual droplets are represented by some characteristic droplets, and the carrier phase is described by Reynolds-Averaged Navier-Stokes (RANS) equations.

29 citations

Journal ArticleDOI
Zhao Chenru1, Qianfeng Liu1, Zhen Zhang1, Pei-Xue Jiang1, Hanliang Bo1 
TL;DR: In this article, simulations of experiments on buoyancy-enhanced heat transfer of supercritical CO2 in a heated vertical tube with an inner diameter of 2.0mm at an inlet Reynolds number, Rein, of 1970 were performed using low Reynolds number turbulence models.
Abstract: The heat transfer enhancement (HTE) from buoyancy occurs in upward and downward flows at supercritical pressures when the buoyancy parameter, Bo*, is above 8 × 10−6. Numerical simulations of experiments on buoyancy-enhanced heat transfer of supercritical CO2 in a heated vertical tube with an inner diameter of 2.0 mm at an inlet Reynolds number, Rein, of 1970 were performed using low Reynolds number turbulence models. The Myong and Kasagi (MK) model quantitatively predicted the buoyancy-enhanced heat transfer. The trade-off between buoyancy effect on the viscous length scale and the redistribution of velocity profiles resulted in similar heat transfer results although the mechanisms on the two aspects were different for upward and downward flows. Heat transfer deterioration (HTD) occurred in upward flow as Rein increased. The supercritical heat transfer in upward flows for various Rein were compared to obtain a better understanding of the buoyancy effect under HTE and HTD conditions.

29 citations


Cited by
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01 Jan 2009
TL;DR: The results imply that the multiscale surface roughness at nanoscale plays a minor role in the impact events for small The authors less than or approximately equal 120 but an important one for large They greater than or about equal 120.
Abstract: We experimentally investigate drop impact dynamics onto different superhydrophobic surfaces, consisting of regular polymeric micropatterns and rough carbon nanofibers, with similar static contact angles. The main control parameters are the Weber number We and the roughness of the surface. At small We, i.e., small impact velocity, the impact evolutions are similar for both types of substrates, exhibiting Fakir state, complete bouncing, partial rebouncing, trapping of an air bubble, jetting, and sticky vibrating water balls. At large We, splashing impacts emerge forming several satellite droplets, which are more pronounced for the multiscale rough carbon nanofiber jungles. The results imply that the multiscale surface roughness at nanoscale plays a minor role in the impact events for small We less than or approximately equal 120 but an important one for large We greater than or approximately equal 120. Finally, we find the effect of ambient air pressure to be negligible in the explored parameter regime We less than or approximately equal 150.

246 citations

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TL;DR: Modeling of particle deposition in the human lung indicated that coarse particles generated by crustal sources may have adverse health effects as strong as those resulting from fine particles generated from combustion sources.

167 citations

Journal ArticleDOI
Mingjun Wang1, Wang Yingjie1, Wenxi Tian1, Suizheng Qiu1, Guanghui Su1 
TL;DR: In this paper, the latest progress of nuclear reactor thermal-hydraulic research using CFD method is outlined, especially at XJTU-NuTheL, where the mathematical models of complicate two-phase boiling phenomena and thermal hydraulic features under the motion conditions are established.

121 citations

Journal ArticleDOI
01 Nov 2019-Energy
TL;DR: In this paper, the research and development of S-CO2 cycles are analyzed from two aspects: (i) the system design and analysis and (ii) energy transfer/conversion mechanisms and key components development.

98 citations

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TL;DR: This work presents a critical and in-depth review of all major thermal models and heat transfer mechanisms pertinent to DEM-based simulations, aiming to provide a clear path for the development of robust thermalDEM-based models.

73 citations