Simulation of Water Mist Spray for Commercial Kitchen Ventilation (CKV) System Using Ansys-CFD

2014 ◽  
Vol 660 ◽  
pp. 704-708 ◽  
Author(s):  
Norzelawati Asmuin ◽  
Mohd Farid Sies ◽  
Mohamad Khairi Hassan ◽  
M.R. Pairan ◽  
N.A. Nor Salim ◽  
...  
Keyword(s):  
Fluid Flow ◽  
Flow Characteristics ◽  
Water Mist ◽  
Simulation Tool ◽  
Spray Nozzle ◽  
Cfd Model ◽  
Nozzle Orifice ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Pressure

Concept of the water mist spray in CKV system is to clean the gas filter at kitchen hood. This research aims to analyze the behavior and flow characteristics of water mist spray produced by spray nozzle. A computational fluid dynamics (CFD) model with k-epsilon turbulence method is a simulation tool for the characterization of sprays. The fluid flow for case1, case 2 and case 3 have the same pattern type of graph. Changes have seen in fluid flow pressure and velocity. The value of fluid flow pressure was decreasing from the first point at water inlet until to the last point at nozzle orifice. The total pressure values for case 1, case 2, and case 3 are 99.997 kPa, 199.991 kPa and 299.992 kPa respectively. The highest velocity is recorded at the liquid tip of the nozzle which is about 144.15 m/s for case 3. In the other hand, the highest value of fluid flow pressure was recorded at the water inlet part.

scholarly journals Numerical study of flow characteristics on wing airfoil eppler 562 with whitcomb winglet variations

2018 ◽  
Vol 204 ◽  
pp. 04009
Author(s):  
S.P Setyo Hariyadi ◽  
Sutardi ◽  
Wawan Aries Widodo ◽  
Muhammad Anis Mustaghfirin ◽  
Arifandi Rachmadiyan
Keyword(s):  
Fluid Flow ◽  
Numerical Study ◽  
Fuel Efficiency ◽  
Flow Characteristics ◽  
Lower Surface ◽  
Computational Fluid Dynamics Cfd ◽  
Fluid Flow Characteristics ◽  
Conducting Research ◽  
Cfd Method ◽  
Wing Airfoil

Winglet is a tool used to improve the efficiency of aircraft and UAV performance by preventing fluid flow jump from lower surface to upper surface at wingtip. The addition of this winglet resulted in improved lift and reduction of drag force from the aircraft wing or UAV. From Whitcomb's research, it was found that the use of winglet on a full size airplane can increase fuel efficiency by 7%. The research led to the idea of conducting research on fluid flow characteristics on the UAV wing with the Eppler 562 airfoil combined with the whitcomb winglet. This numerical study was conducted using the Computational Fluid Dynamics (CFD) method based on the advantages of using this simulation that can review the fluid flow in macroscopic way. This study is provide accurate fluid flow visualization results and can improve the performance of the wings when compared with wings without winglet (plain wing). Wing with the Eppler 562 airfoil combined with the whitcomb winglet results reduction in rotating motion that makes velocity components as opposed to lift.

Characterization of Single-Phase Flow Hydrodynamics in Berty Reactor using Computational Fluid Dynamics (CFD)

2021 ◽  
Author(s):  
Khunnawat Ountaksinkul ◽  
Sirada Sripinun ◽  
Panut Bumphenkiattikul ◽  
Surapon Bubphacharoen ◽  
Arthit Vongachariya ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Single Phase ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Kinetic Studies ◽  
Stirred Tank Reactors ◽  
Computational Fluid Dynamics Cfd ◽  
Continuous Stirred Tank

This work studies the flow characteristics in the Berty reactor, a gradientless reactor for kinetic studies, using three-dimensional (3D) computational fluid dynamics (CFD), and the non-ideal continuous stirred tank reactors...

3D Numerical Simulation of the Airflow in a Pneumatic Splicer

2011 ◽  
Vol 130-134 ◽  
pp. 2345-2348
Author(s):  
Xiao Xing ◽  
Guo Ming Ye
Keyword(s):  
Numerical Simulation ◽  
High Speed ◽  
Air Flow ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Swirling Flows ◽  
Computational Results ◽  
Cfd Model ◽  
3D Numerical Simulation ◽  
Computational Fluid Dynamics Cfd

To investigate the effect of air flow in an pneumatic splicer on splicing performance, a computational fluid dynamics (CFD) model has been developed to simulate the air flow characteristics in an splicing chamber. Three-dimensional numerical simulation is conducted and standard K-ε turbulence model is used. Velocity distributions in the chamber are presented and analyzed. The computational results show that the velocities in the chamber are transonic. The air flows in the chamber are two swirling flows with opposite directions. This work also shows that CFD technique can provide a better understanding of the behavior of the high speed air flow in the air splicing chamber.

Flow Characteristics of Gerotor Motors with Pin and Nonpin Designs

2022 ◽  
Author(s):  
Chiu-Fan Hsieh ◽  
Tehseen Johar ◽  
Yi-Hao Lin
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Flow Characteristics ◽  
Geometric Design ◽  
Performance Quality ◽  
Output Torque ◽  
Computational Fluid Dynamics Cfd ◽  
The Stability ◽  
Comparison Of The Results ◽  
Velocity Pressure

Abstract The geometric design of a gerotor motor has a significant impact on its function, performance, quality, reliability and cost. When designing a gerotor motor all these features must be considered. A gerotor motor can be classified into two types based on the geometric design; gerolor (pin design) and gerotor (nonpin design). In this article geometric parameters of the two design types are discussed briefly and the operation of the gerotor motor is described as well. A numerical analysis is carried out by using computational fluid dynamics (CFD) tool (PumpLinx) to analyze the fluid flow and predict the performance of both types of gerotor designs. Various characteristics of the two designs of the gerotor motor are investigated and compared which include the gerotor design, fluid flow rate, velocity, pressure and output torque. Comparison of the results found out that using pin design gerotor motor, the flow rate, flow velocity, pressure and torque will vary greatly. Nonpin design can significantly reduce variations in all the flow characteristics thereby enhancing the stability and reduction in the leakage risk.

Using Computational Fluid Dynamics (CFD) for Evaluation of Fluid Flow Through a Gate Valve

2012 ◽  
Vol 8 (4) ◽  
Author(s):  
Pedro Esteves Duarte Augusto ◽  
Marcelo Cristianini
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Fluid Flow ◽  
Pressure Drop ◽  
Gate Valve ◽  
Flow Behavior ◽  
Flow Characteristics ◽  
Type Equation ◽  
Pharmaceutical Products ◽  
Computational Fluid Dynamics Cfd

Abstract Gate valves are the most common valve in industrial plants. However, there is no work in the literature regarding the use of computational fluid dynamics (CFD) to evaluate the fluid flow characteristics and pressure drop in gate valves. The present work evaluated the fluid flow and pressure drop through a commercial gate valve using CFD. The obtained values for the pressure loss coefficient (k) are in accordance to those described in the literature and a power type equation could be used for modeling it as function of the Reynolds Number. Fluid flow behavior through the gate valve highlighted the flow recirculation and stagnant areas, being critical for food and pharmaceutical products processing. The obtained results reinforce the advantages in using CFD as a tool for the engineering evaluation of fluid processes.

Investigation of the fluid flow during the recoating process in additive manufacturing

2019 ◽  
Vol 26 (4) ◽  
pp. 605-613
Author(s):  
Andrei Kozhevnikov ◽  
Rudie P.J. Kunnen ◽  
Gregor E. van Baars ◽  
Herman J.H. Clercx
Keyword(s):  
Fluid Flow ◽  
Cfd Simulation ◽  
Flow Characteristics ◽  
Rectangular Cavity ◽  
Cavity Depth ◽  
Content Type ◽  
Loop Control ◽  
Computational Fluid Dynamics Cfd ◽  
Distance Sensor ◽  
Step Over

Purpose This paper aims to explore the fluid flow in the stereolithography process during the recoating step. The understanding of the flow dynamics can be used as an input for an active control of the resin surface height map. The recoating over a rectangular cavity has been considered to investigate the influence of the cavity depth on the resin surface height map. Design/methodology/approach Two-dimensional numerical simulations have been used to obtain the flow characteristics as function of the cavity depth. An experimental setup, which mimics the recoating process in the stereolithography process, was used to verify the results of simulations and to test the suitability of the 2D model. The surface height profile along the centreline was measured by a confocal chromatic distance sensor and compared to the 2D numerical results. Findings By means of computational fluid dynamics (CFD) simulation, the flow in the cavity and the free-surface behaviour of the resin was explained for different cavity depths and confirmed by experiments. Research limitations/implications The study is focused only on the cavity depth variation to show feasibility and suitability of the presented CFD model and the proposed analytical expression to estimate the layer thickness. Practical implications The proposed approach can serve as a tool for designing the closed-loop control for the recoating system in the next generation of stereolithography equipment. Originality/value In the present work, the fluid flow behaviour, a source of significant imperfection in the recoating process, has been investigated during the recoating step over a rectangular cavity.

Gland Seal Erosion in a Geothermal Turbine

2003 ◽  
Author(s):  
Zdzislaw Mazur ◽  
Luis M. Palacios ◽  
Gustavo Urquiza
Keyword(s):  
Fluid Dynamics ◽  
Solid Particles ◽  
Steam Flow ◽  
Cfd Model ◽  
Flow Conditions ◽  
System Flow ◽  
Gland Seal ◽  
Rotor Surface ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Pressure

Excessive erosion of the low-pressure shaft end gland seal of a 25 MW geothermal turbine has been investigated. Due to excessive erosion of the gland seal rotor surface the turbine vacuum was partially destroyed and the efficiency of the cycle degraded. This study uses computational fluid dynamics (CFD) to identify the causes of erosion and the optimal steam seal system flow conditions for reducing the erosion problem. The predictions were based upon a numerical calculation using a CFD model of the rotor end gland seal with a steam flow containing hard solid particles and solved with the commercial CFD code: Adapco STAR-CD. The results confirmed the existence of flow conditions that play a major role in the rotor gland seal erosion. Afterwards, the flow was simulated changing seal steam flow conditions (flow pressure). It was confirmed that there exists threshold seal flow conditions below which erosion does not occur. The recommendations for adjusting shaft end gland seal system are provided to avoid erosion problem.

scholarly journals Effect of Furnace Gas Composition on Characteristics of Supersonic Oxygen Jets in the Converter Steelmaking Process

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3353
Author(s):  
Liujie Yao ◽  
Rong Zhu ◽  
Yixing Tang ◽  
Guangsheng Wei ◽  
Kai Dong
Keyword(s):  
High Temperature ◽  
Volume Fraction ◽  
Flow Characteristics ◽  
Converter Steelmaking ◽  
Cfd Model ◽  
Steelmaking Process ◽  
Combustion Experiment ◽  
Computational Fluid Dynamics Cfd ◽  
Fluid Flow Characteristics ◽  
Jet Characteristics

During the converter steelmaking process, the presence of supersonic oxygen jets can provide oxygen to high-temperature metal baths that promotes chemical reactions in the bath, accelerates the smelting rhythm, and facilitates a uniform distribution of the ingredients in the bath. In this paper, a computational fluid dynamics (CFD) model with combustion reactions is established and compared to the results of combustion experiment. This paper studies the behavior and fluid flow characteristics of supersonic oxygen jets under different environmental compositions under a steelmaking temperature of 1873 K. This validated CFD model can be used to investigate the effect of furnace gas on supersonic oxygen jet characteristics during the converter steelmaking process. The results indicate that the composition of furnace gas has an impact on the characteristics of the oxygen jet. Specifically, as the carbon monoxide (CO) volume fraction increases, the high velocity region of supersonic oxygen jet increases, and the high temperature and the high turbulent kinetic energy regions expand.

CFD Simulations of Flows in Step-up Street Canyons

2020 ◽  
Author(s):  
Soo-Jin Park ◽  
Jae-Jin Kim ◽  
Eric Pardyjak ◽  
Ji-Yoon Hong
Keyword(s):  
Wind Tunnel ◽  
Flow Characteristics ◽  
Width Ratio ◽  
Cfd Model ◽  
Wind Tunnel Experiments ◽  
Cfd Simulations ◽  
Street Canyons ◽  
Recirculation Zones ◽  
Computational Fluid Dynamics Cfd ◽  
Two Stages

<p>We analyzed the flow characteristics in strep-up street canyons using a computational fluid dynamics (CFD) model. Simulated results are validated against experimental wind-tunnel results, with the CFD simulations conducted under the same building configurations (H<sub>u</sub>/H<sub>d</sub> = 0.33, 0.6 and L/S = 1, 2, 3, and 4; H<sub>u</sub>, H<sub>d</sub>, L, and S respectively indicate the upwind, downwind building heights, the building length and street-canyon width) as those in the wind-tunnel experiments. The CFD model reproduced the in-canyon vortex, recirculation zones above the downwind buildings, and stagnation point position reasonably well. Furthermore, we analyze the flow characteristics in the step-up street canyons based on the numerical results. The in-canyon flows simulated in the shallow (H<sub>u</sub>/H<sub>d</sub> = 0.33) and deep (H<sub>u</sub>/H<sub>d</sub> = 0.6) street canyons underwent two stages (development and mature stages) as the building-length ratio increased. In the development stages, one clockwise-rotating vortex was formed in the step-up street canyons and its center was slightly tilted toward the wall of the upwind building. However, in the mature stages, two clockwise-rotating vortices were formed in the upper and lower layers. A clockwise vortex and a counterclockwise vortex were stabilized as the building width ratio increased.</p>

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