A Study of a New Bidirectional Pressure-Regulating Valve for Hydraulically Interconnected Suspension Systems

2020 ◽  
Vol 143 (3) ◽  
Author(s):  
Liang Luo ◽  
Nong Zhang ◽  
Minyi Zheng ◽  
Jinglai Wu ◽  
Bo Zhu
Keyword(s):  
Cfd Simulation ◽  
Detailed Structure ◽  
Pressure Shock ◽  
Suspension Systems ◽  
System Pressure ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
Driving Conditions ◽  
Structure And Functions ◽  
Hydraulic Circuits

Abstract Due to inevitable inner leakage in hydraulic circuits and structural limits of a hydraulically interconnected suspension (HIS) system, pressure difference between HIS's two independent hydraulic circuits leads to vehicular unbalance under noncornering driving conditions and deteriorates HIS's performance under steering driving conditions. In order to address this problem, a new bidirectional pressure-regulating valve was designed to balance hydraulic pressures in the two HIS's hydraulic circuits under noncornering driving conditions. Moreover, it separates the two hydraulic circuits and enables HIS's antirollover function under cornering driving conditions. Detailed structure and functions of this valve were introduced first. Systematic and computational fluid dynamics (CFD) simulation results show that the gap between the spool and cylinder is of importance to valve's performance. Experimental results validate that the developed valve satisfies all requirements of the HIS. Furthermore, the valve can distinguish steering and nonsteering conditions and enables HIS's function accurately without any pressure shock.

Optimal Hardware Placement in a Minitower Computer Enclosure System

2011 ◽  
Author(s):  
M. Alfaro Cano ◽  
A. Hernandez-Guerrero ◽  
C. Rubio Arana ◽  
Aristotel Popescu
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Cfd Simulation ◽  
Operating Temperature ◽  
Optimal Placement ◽  
Cfd Analysis ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
The Relationship ◽  
Key Questions

One of the requirements for existing personal computers, PCs, is that the hardware inside must maintain an operating temperature as low as possible. One way to achieve that is to place the hardware components at locations with enough airflow around it. However, the relationship between the airflow and temperature of the components is unknown before they are placed at specific locations inside a PC. In this work a Computational Fluid Dynamics (CFD) analysis is coupled to a Design of Experiment (DOE) methodology to answer typical minitower key questions: a) how do the possible positions of hardware components affect their temperature?, and b) is it possible to get an optimal placement for these hardware components using the data collected by the CFD simulation results? The DOE methodology is used to optimize the analysis for a very large number of possible configurations. The results help in identifying where the efforts need to be placed in order to optimize the positioning of the hardware components for similar configurations at the designing stage. Somehow the results show that general conclusions could be drawn, but that there are not specific rules that could be applied to every configuration.

Simulation on Flow Field and Temperature Field in Water Cooling Tuyere of Blast Furnace

2013 ◽  
Vol 753-755 ◽  
pp. 2709-2712 ◽  
Author(s):  
Ya Na Qie ◽  
Shu Hui Zhang ◽  
Qing Lv ◽  
Li Hong Zhang
Keyword(s):  
Temperature Field ◽  
Economic Benefit ◽  
Cfd Simulation ◽  
Water Pressure ◽  
High Yield ◽  
Maximum Temperature ◽  
Water Cooling ◽  
Direct Motion ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results

Life span of water cooling tuyere is one of important factors of blast furnace’s direct motion and high yield. In order to improve the life of tuyere, the flow fleld and temperature field of tuyere were simulated by using computational fluid dynamics (CFD). Simulation results show that the maximum temperature appears at the front margin of tuyere outlet side. The highest temperature of tuyere reduces significantly with the increase of water pressure below 0.4MPa. When the water pressure exceeds 0.4Pa, the highest temperature reduces slowly. In consideration of economic benefit and cooling effect, the best point of inlet pressure is 0.4MPa or so.

scholarly journals Performance Assessment of Bladeless Micro-Expanders Using 3D Numerical Simulation

2019 ◽  
Vol 113 ◽  
pp. 03016 ◽  
Author(s):  
Avinash Renuke ◽  
Alberto Traverso ◽  
Matteo Pascenti
Keyword(s):  
Shear Stress ◽  
Cfd Simulation ◽  
Numerical Data ◽  
Flow Density ◽  
Cfd Analysis ◽  
Mixing Zone ◽  
Sst Turbulence Model ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
First Time

This paper summarizes the development of fully 3D Computational Fluid Dynamics (CFD) analysis for bladeless air micro expander for 200 W and 3 kW rated power. Modelling of nozzle along with rotor is done using structured mesh. This analysis, for the first time, demonstrates the interaction between nozzle and rotor using compressible flow density-based solver. The Shear Stress Transport (SST) turbulence model is employed to resolve wall effects on the rotor and to determine the shear stress accurately. The results illustrate the flow field inside stator and rotor along with complicated mixing zone between stator and rotor. The comparison of rotor-stator CFD simulation results is done with experiments to preliminary validate the model. The losses in the turbine are discussed with the help of experimental and numerical data.

scholarly journals CFD Simulation of the Airflow Distribution Inside Cube-Grow

CFD Letters ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 81-89
Author(s):  
Arina Mohd Noh ◽  
Hamdan Mohd Noor ◽  
Fauzan Ahmad
Keyword(s):  
Plant Growth ◽  
Urban Agriculture ◽  
Cfd Simulation ◽  
Measurement Data ◽  
Actual Measurement ◽  
Airflow Distribution ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
Urban People ◽  
Air Hole

Cube-Grow was developed by MARDI to promote urban agriculture to the urban population. The product enables urban people to grow their vegetables with limited space. The initial test run of the system shows that the plant growth inside the structure was below expectation. The problem arises due to a lack of airflow or improper ventilation inside the structure. Optimum ventilation or airflow is crucial for plant growth as it enhances evapotranspiration at the leaf area to promote optimum plant growth. Therefore, this study aims to increase the airflow inside the Cube-Grow and find the best location for the air hole. Computational fluid dynamics (CFD) simulation was used in this study the analyse the effect of adding an air hole to the airflow characteristic inside the Cube-Grow. CFD also was used to select the best location to place the air hole. 3 option of air hole location was analysed and the results were compared with the existing design. The initial CFD simulation results were compared with the actual measurement data before it was used for further analysis. The result shows that adding an air hole increases overall airflow inside the Cube-Grow. Option 3 was chosen as the best location for the air hole as it produces a uniform and higher airflow inside the Cube-Grow. The study proved that CFD was able to be used to optimize the design of Cube-Grow before the actual prototype was built.

Optimization of Quench Tank Structure Based on CFD Simulation

2006 ◽  
Vol 118 ◽  
pp. 363-368 ◽  
Author(s):  
Nai Lu Chen ◽  
Wei Min Zhang ◽  
Qiang Li ◽  
Chang Yin Gao ◽  
Bo Liao ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Flow Rate ◽  
Cfd Simulation ◽  
Draft Tube ◽  
Structure Design ◽  
Rate Distribution ◽  
Large Size ◽  
Solid Foundation ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results

In order to investigate the flow rate distribution and improve the flow rate uniformity of the quenchant in a quench tank, the ultrasonic Doppler velocimeter (UDV) was used to measure the flow rate of quenchant with agitation, and then a computational fluid dynamics (CFD) simulation was carried out to simulate the flow rate distribution without / with flow baffles. According to the CFD simulation results, the structures and positions of flow baffles in the draft-tube were optimized to obtain the uniform flow rate distribution in the quench zone, which were verified by experiments as well. The simulation and experimental results show that the UDV is suitable for measuring the flow rate of a large-size quench tank. This research provided a solid foundation for optimizing the structure design of flow baffles in production quench tanks.

scholarly journals Enhanced Bauxite Recovery Using a Flotation Column Packed with Multilayers of Medium

Minerals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 594 ◽  
Author(s):  
Pengyu Zhang ◽  
Wencai Zhang ◽  
Leming Ou ◽  
Yuteng Zhu ◽  
Zicheng Zhu
Keyword(s):  
Silicon Content ◽  
Cfd Simulation ◽  
Fluid Velocity ◽  
Flotation Column ◽  
Flotation Recovery ◽  
Content Ratio ◽  
Turbulent Characteristics ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
The Impact

An innovative self-designed medium was packed in a bench-scale flotation column to study its influence on the flotation recovery of bauxite. Computational fluid dynamics (CFD) simulation was conducted to reveal the impact of the packing medium on the turbulent characteristics of collection zone in the column. Simulation results show that multilayer packing of the medium divides the collection zone into small units having different turbulent intensities, which is more suitable for flotation separation. The packing medium decreases the turbulence kinetic energy (from 1.08 × 10−2 m2/s2 to 2.1 × 10−3 m2/s2), turbulence eddy dissipation (from 3.71 × 10−2 m2/s3 to 9.8 × 10−3 m2/s3) and axial fluid velocity of fluid in the column. With three layers of packing, the recovery of Al2O3 increased by 2.11% and the aluminum to silicon content ratio of the concentrate improved from 5.16 to 9.72.

scholarly journals How Does Your Fluid Flow?

2003 ◽  
Vol 125 (12) ◽  
pp. 35-37
Author(s):  
Jean Thilmany
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluid Flow ◽  
Cfd Simulation ◽  
Flow Simulations ◽  
Computational Fluid Dynamics Cfd ◽  
Advanced Analysis ◽  
Simulation Results

This article reviews the method of analyzing fluid flow in structures and designs, which is enjoying a burst of interest. Twenty years later, manufacturers across a myriad of industries are licensing the technology from a pool of vendors who now market computational fluid dynamics (CFD) packages of many stripes. Engineers use CFD to predict how fluids will flow and to predict the quantitative effects of the fluid on the solids with which they are in contact. Airflow is commonly studied with the software. Many mechanical engineers do not need access to all the bells and whistles an advanced CFD program can provide. Advanced analysis programs are usually the purview of a user trained on a particular CFD package. Engineers used CFD to determine how to best position the fans so that air flowed inside the refrigerator and the freezer in the most efficient way. After studying fluid flow simulations, they made prototypes of the most promising modeled designs to see if the prototypes matched CFD simulation results.

scholarly journals Hemodynamic Investigation of the Effectiveness of a Two Overlapping Flow Diverter Configuration for Cerebral Aneurysm Treatment

2021 ◽  
Vol 8 (10) ◽  
pp. 143
Author(s):  
Yuya Uchiyama ◽  
Soichiro Fujimura ◽  
Hiroyuki Takao ◽  
Takashi Suzuki ◽  
Motoharu Hayakawa ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
Cerebral Aneurysms ◽  
Flow Diverter ◽  
Cfd Simulations ◽  
Qualitative And Quantitative ◽  
Pressure Loss Coefficient ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
Wide Neck ◽  
Flow Diverters

Flow diverters (FDs) are widely employed as endovascular treatment devices for large or wide-neck cerebral aneurysms. Occasionally, overlapped FDs are deployed to enhance the flow diversion effect. In this study, we investigated the hemodynamics of overlapping FDs via computational fluid dynamics (CFD) simulations. We reproduced the arterial geometry of a patient who had experienced the deployment of two overlapping FDs. We utilized two stent patterns, namely the patterns for one FD and two overlapping FDs. We calculated the velocity, mass flow rate, wall shear stress, and pressure loss coefficient as well as their change rates for each pattern relative to the no-FD pattern results. The CFD simulation results indicated that the characteristics of the blood flow inside the aneurysm were minimally affected by the deployment of a single FD; in contrast, the overlapping FD pattern results revealed significant changes in the flow. Further, the velocity at an inspection plane within the aneurysm sac decreased by up to 92.2% and 31.0% in the cases of the overlapping and single FD patterns, respectively, relative to the no-FD pattern. The simulations successfully reproduced the hemodynamics, and the qualitative and quantitative investigations are meaningful with regard to the clinical outcomes of overlapped FD deployment.

scholarly journals Energy-Efficient Improvement Approaches through Numerical Simulation and Field Measurement for a Data Center

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2757 ◽  
Author(s):  
Fujen Wang ◽  
Yishun Huang ◽  
BowoYuli Prasetyo
Keyword(s):  
Numerical Simulation ◽  
Data Center ◽  
Cfd Simulation ◽  
Field Measurements ◽  
Heat Index ◽  
Temperature Index ◽  
Performance Indexes ◽  
Airflow Distribution ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results

The power density of electronic equipment increased dramatically recently. Data center and data processing and telecommunication facilities are facing the exceptionally high sensible heat loads which result in a large amount of energy consumption. In this study, a numerical simulation using computational fluid dynamics (CFD) was conducted to investigate the influence of alternative approaches to avoid bypassing and recirculation for air distribution in a full-scale data center. Field measurements were extensively conducted to validate the simulation results. Various performance indexes were adopted to enhance the evaluation of the thermal performance of the data center. The simulation results revealed that the practice with hot aisle enclosure and the installation of blocking panels for the unoccupied racks can provide satisfactory airflow distribution and thermal management under low load conditions. The return temperature index (RTI) can be improved by 3% through CFD simulation through installation of the blank panels, which reveals the reduction of recirculation airflow. The return heat index (RHI) increases by 8%, which presents a reduction of bypass airflow. A practical experiment using physical air curtains was conducted to enclose the hot aisle in the data center, which also reveals an 8% improvement for bypass airflow. Higher cooling performance can be achieved via reduction of recirculation and bypass airflow in the data center. Through the simulation of different improvement approaches in the data center, the optimum practice for cooling airflow arrangement can be identified accordingly.

Experimental and CFD investigations of carbon/SS316 mechanical face seals under different lubricating conditions

2015 ◽  
Vol 67 (2) ◽  
pp. 124-132 ◽  
Author(s):  
S. Kavinprasad ◽  
S. Shankar ◽  
M. Karthic
Keyword(s):  
Cfd Simulation ◽  
Experimental Results ◽  
Compressed Air ◽  
Content Type ◽  
Seal Design ◽  
Face Seals ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
Sealing Pressure ◽  
Materials Used

Purpose – The purpose of this paper is to test mechanical face seals made of carbon/SS316 with different coolants for evaluating its tribological performance. The reliability of a mechanical seal mainly depends on the seal materials and the type of coolant used for the lubrication. Design/methodology/approach – Compressed air, vacuum and nitrogen are the main coolants utilized for the experimental work, and the obtained results are compared with the dry running case for a specified period. The experimental results are also validated with the computational fluid dynamics (CFD) simulation results. Findings – The results shows that the sealing pressure, sliding speed and materials used would be the predominant factors for the seal design. Over compressed air, vacuum and nitrogen cooling techniques were found to be more efficient. Originality/value – The experimental results are also validated with the CFD simulation results. This paper also emphasizes the usage of vacuum as a cooling medium in industries, which will enhance the seal life at an economical cost over nitrogen.

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