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The thermal behavior of the inside air of a closed Venlo glasshouse without plants was analysed under semi-arid climate conditions. The aim of the study was to investigate to what extent the characteristics of the greenhouse design and outside climatic conditions influence airflow and temperature patterns inside the greenhouse.
Get Price1008_14 numerical simulation of airflow distribution in mixed flow dryer 1008_15 COMPUTATIONAL FLUID DYNAMICS (CFD) ANALYSIS OF AIR FLOW UNIFORMITY IN A FIXED-BED DRYER FOR MEDICINAL PLANTS 1008_16 UTILIZATION OF NITROGEN GAS FOR REFRIGERATION AND ATMOSPHERE MODIFICATION IN GRAIN STORAGE: A SIMULATION STUDY
Get PriceNumerical Simulation of the Airflow Over a Military Aircraft with Active Intake T Triantafyllou*, T Nikolaidis, M Diakostefanis, P Pilidis Cranfield University, School of Aerospace, Transport and Manufacturing, College Rd, Cranfield, Bedford MK43 0AL, United Kingdom ABSTRACT The aim of the study presented herein is to numerically predict the ...
Get PriceRequest PDF | On Jun 1, 2004, D. Pless and others published Numerical simulation of airflow and temperature during inspiration in a nose model with septal perforation | Find, read and cite all the ...
Get PriceThe change of bubbles and the position of the tuyere in an oxygen coal combustion melting and separating furnace affect the flow and splash behavior of the molten pool. To analyze this problem further, a three-dimensional numerical simulation method was used to explore the behavior and change of the flow field inside the molten pool during double-row tuyere injection. In addition, the ...
Get PriceHence, the application of existing models is restricted to small apparent contact angles. Moreover, the effects of surface structures or roughness are not included in these lubrication models. To overcome these limitations, a direct numerical simulation (DNS) of the liquid flow and heat transfer within the microregion is presented in this paper.
Get PriceWe study wind turbulence over breaking waves based on direct numerical simulation (DNS) of two-fluid flows. In the DNS, the air and water are simulated as a coherent system, with the interface captured using the coupled level-set and volume-of-fluid method.
Get PriceThe results of numerical simulation showed that the dust-carrying airflow, after being blocked by the coal cutter, dispersed in the lateral direction, leading to an increase of airflow velocity on the walkway side to 1.75 m s −1, and a dust concentration as high as 2500 mg m −3. At the same time, an airflow vortex area with the largest ...
Get PriceFor dry powder inhalers, the airflow properties in the airways could affect the deposition of inhaled particles; the flow patterns vary inherently between patients. This paper provides an evaluation of the effects of six airflow patterns on the behaviour of inhaled particles, as determined by using numerical simulations…
Get PriceIn this paper, the acoustic behaviour of chip fans is characterised by measuring the sound pressure levels at different speeds when running idle. In addition, the aeroacoustic and flow behaviour of chip turbines is numerically modelled with a Computational Fluid Dynamic (CFD) simulation.
Get PriceThis paper presents a relatively simple method to analyze potential methane hazard and preventive methods based on a computer simulation of the airflow and methane emission on the longwall face and in the goaf. The presented approach considers the operation of a longwall shearer and conveyers and their possible impacts on both direct emissions of methane and migration from adjacent goafs.
Get PriceNumerical simulation of airflow characteristics in the spinning zone at starting time of air-jet spinning machine. Thi Viet Bac Phung, Akihiro Yoshida, Yoshiyuki Iemoto, Hideyuki Uematsu, and Shuichi Tanoue ... The effect of different nozzle configurations on airflow behaviour and yarn quality.
Get PriceNumerical Simulation of Ventilation Air Flow in Underground Mine Workings S.M. Aminossadati ... simulate the airflow behavior in underground cross-cut regions, where brattice sails are used to direct the airflow into these regions. Brattice sails are cost effective ventilation control devices for temporary or permanent use in
Get PriceCHAPTER 6 APPLICATION OF NUMERICAL SIMULATION TO VENTILATED FLOW PROBLEMS 102 6.1 Introduction Airflow in ventilated enclosures can be divided into the following groups: mixing type where the flow is driven by forced convection, and natural convection where the main driving force is the buoyancy.
Get PriceReynolds average method (RANS) is a numerical. simulation method widely used in vehicle aerodynamic s. simulation…
Get PriceNumerical study of the airflow over forest clearings. In order to better understand the behaviour of the turbulent flow around forests interrupted by clearings, numerical simulations with a LVEL k-ϵ turbulence model have been performed. The effects of the clearing width on the flow field were studied for two-dimensional forest-clearing-forest ...
Get PriceExport Figures View in gallery Shape of the oscillating membrane as described in Eqs. –. View in gallery Time–height cross section (a) of the observed zonal-mean zonal flow velocity component [adapted from Fig. 10 in Plumb and McEwan (1978), contour lines are in mm s −1] and (b) compared to the results of the 3D numerical simulation at y = L y /2 (contour lines are in m s −1).
Get PriceThe indoor airflow and contaminant particle concentration in two geometrically different rooms have been investigated using the Large Eddy Simulation (LES) technique based on Renormalization Group (RNG) theory derived by Yakhot, Orszag, Yakhot and Israeli, Journal of Scientific Computing, 1989. The first room is without contaminant particles.
Get PriceThis paper reports large eddy simulations of the interaction between an atmospheric boundary layer and a canopy (representing a forest cover). The problem is studied for a homogeneous configuration representing the situation encountered above a continuous forest cover, as well as for a heterogeneous configuration representing the situation similar to an edge or a clearing in a forest. The ...
Get PriceWhen tunnel boring machines (TBMs) are used to construct tunnels, large quantities of rock dust are produced, affecting the working environment of construction personnel. To explore ways to improve the air quality in tunnels, this study employed a numerical simulation to investigate controlling rock dust via tunnel ventilation systems. The results showed that when the secondary compressed ...
Get PriceThe direct numerical simulation (DNS) of an idealized isolated cough is used to characterize the jet/puff dynamics using the trajectory of the leading turbulent vortex ring and extract its topology by fitting an ellipsoid to the exhaled fluid contour.
Get PriceNumerical simulations of the flow with the prescribed displacement of the airfoil and comparison with experiment V Řidký1,2, P Šidlof 1,2DQG V Vlček2 1Technical University of Liberec, NTI FM ...
Get PriceNumerical simulation of ventilation air flow in underground mine workings. ... This paper uses CFD modeling to simulate the airflow behavior in underground crosscut regions, where brattice sails are used to direct the airflow into these regions. Brattice sails are cost effective ventilation control devices for temporary or permanent use in ...
Get PriceA Mach-10 hypersonic boundary layer of air overriding a cold, isothermal, non-catalytic flat wall, and with a stagnation enthalpy of 21.6 extrm {MJ} extrm {kg}^{-1}, is analysed using direct numerical simulations.The calculations include multicomponent transport, equilibrium vibrational excitation and chemical kinetics for air dissociation.
Get Priceshows the behavior of different turbulence models, as well as the effect of the grid layout and differencing schemes on the numerical results. 2. TURBULENCE MODELS Airflow over the Ahmed body is governed by the Navier-Stokes equations. As turbulent flow is made up of a spectrum of vortex scales, the turbulence
Get PriceNUMERICAL SIMULATION OF STEADY FLOW IN A COMPLIANT TUBE OR CHANNEL WITH TAPERED WALL THICKNESS. Journal of Fluids and Structures, Vol. 16, Issue. 8, p. 1009. Journal of Fluids and Structures, Vol. 16, Issue. 8, p. 1009.
Get PriceY. N. Zhang, M.E.Sc. (co-supervised with Prof. Jiang, Dept. of ECE, The University of Western Ontario, Chief Supervisor: Zhang), “Numerical Simulation of Fluid Flow and Heat Transfer in Supercritical Water Cooled Reactor ,” Department of Mechanical and Materials Engineering, The University of Western Ontario (completed in April 2009).
Get Price4.1. Distribution of Airflow Velocity Field in the Tunnel. The tunnel face is the most likely location where gas is emitted and accumulated, and the ventilation effect of this location directly affects the ventilation status of the entire tunnel. Therefore, the local airflow field of the tunnel face is the focus of this numerical simulation study.
Get PriceNumerical Simulation and Analysis of HVAC Duct Student Name: Shivanand Doddaganiger Guide Name: Dr. N. R. Deore Simulation of passenger compartment climatic conditions is becoming increasingly important as an alternate to wind-tunnel and field testing to achieve improved airflow comfort while
Get PriceThe selections of simulation tool and the methods for simplifying and validating the models are key to predicting the data center's thermal behavior correctly. In addition, airflow …
Get PriceThe numerical model included the area from the front tip of the nose to the posterior end of the nasal concha. As displayed in Fig. 1a, b, the nasopharynx was expanded to fit the experimental setup. The geometry of the human nasal cavity was created by aligning and processing 40 computed tomographic (CT) images of the respiratory tract of a healthy man.
Get PriceUnderhood vehicle airflow simulations are an important part of the overall vehicle thermal management process, especially in the preliminary stages of the vehicle development program when performing experimental work on cooling system prototypes can prove to be expensive, time-consuming, or simply impossible due to the absence of any physical vehicle prototypes. Accurate prediction of the ...
Get PriceQili, W., Binbin, J., Mingquan, Y. et al. Numerical simulation of the flow and erosion behavior of exhaust gas and particles in polysilicon reduction furnace. Sci Rep 10, 1909 (2020). https://doi ...
Get PriceThe melt-blowing process uses high-speed and high-temperature airflow from the die head to draw polymer melt into micron-sized fibers. In this work, to reduce the diameter of the melt-blowing fibers, three new slot dies have been designed based on the common slot die. With computational fluid dynamics technology, the two-dimensional flow fields from these new types of slot dies were ...
Get PriceSong et al. (2016), for example, conducted direct numerical simulations (DNS) of the flow induced by a hummingbird in forward flight. They used a nominal geometry representing the hummingbird and the kinematics were extracted from high-speed videos of the bird flying in the wind tunnel.
Get PriceNumerical tool comes in handy to investigate and optimize the flow through the check valve. In this investigation, transient conditions are identified and simulated to study the airflow and pressure drop through check valve. A check valve sub-system consists of valve body, valve, spring and retainer.
Get PriceThe inhaled air may carry many toxic particles or pharmaceutical aerosols to the human respiratory system in addition to oxygen. During inhalation, the fresh air inhaled through the mouth or the nose is transported to the distal zones of the lungs (i.e., the acinar region), while the waste air leaves the body by following the same path during exhalation.
Get PriceRequest PDF | Numerical Computations of Room Airflow Regimes | Airflow characteristics in the air-conditioned spaces play an important role to obtain the comfortable and hygienic conditions. This ...
Get PriceAveraged Navier Stokes) for airflow movement. These works include particle dispersion in a ventilated room with objects inside with a zero equation model by Zhao and Guan (2007), cross and single side ventilation with a k- Ý model by Visagavel, et al. (2009), numerical simulation models for the calculation of heat transfer coefficients by
Get PriceBy using direct numerical simulation (DNS), Lin et al. [35] compared two different airway models, one of which was from the mouth up to generation 6 and the other started from the trachea. They concluded that the second model that lacked upper airway could not provide a realistic airflow field in the lung. Thus, to reliably estimate the amount
Get PriceUnderhood vehicle airflow simulations are an important part of the overall vehicle thermal management process, especially in the preliminary stages of the vehicle development program when performing experimental work on cooling system prototypes can prove to be expensive, time-consuming, or simply impossible due to the absence of any physical vehicle prototypes.
Get PriceThe numerical model included the area from the front tip of the nose to the posterior end of the nasal concha. As displayed in Fig. 1a, b, the nasopharynx was expanded to fit the experimental setup. The geometry of the human nasal cavity was created by aligning and processing 40 computed tomographic (CT) images of the respiratory tract of a healthy man.
Get Price3-D Numerical Simulation of Particle Concentration Effect on a ... and airflow patterns under the influence of EHD and external flows, assuming various particle concentrations. ... direct numerical simulation (DNS) algorithm for turbulent flow in a channel. Schmid and Vogel developed a model in which a Lagrangian
Get Priceresearch, the airflow performance and acoustic behaviour of the contra-rotating fan will be studied. The objectives of this study are to perform the simulations for the flow generation by the contra-rotating fans, furthermore, investigate the effect of the different spacing between the two propellers on the noise generation.
Get PriceThe paper established a computational model of aerodynamic noises for 3-train formation including 3 trains, 6 bogies and 2 windshields. Based on Lighthill acoustic theories, a wideband noise source model was used to recognize the aerodynamic noise source of the high-speed train. Aerodynamic pressures of the high-speed train were extracted and compared with experimental results.
Get PriceLand scarcity in relation to the swift urbanisation causes vertical development of buildings and infrastructures. The increasing importance of the main vertical transport - elevator, urges the elevator aerodynamics study to evaluate its acoustic, ride comfort, aerodynamics performance, and airflow effect. They were carried out experimentally or(and) via modeling and simulation.
Get PriceNUMERICAL SIMULATION OF CLOUD DROP IMPINGEMENT ON A HELICOPTER 3.1 Tail Rotor . Initially, the supercooled drops are located upstream of the tail rotor, on a y-z plane parallel to the tail rotor rotation axis; the distance between the axis of rotation and this plane is 5 m, Figure 1. Numerical testing showed that
Get PriceIn this paper, the authors present results on dynamic behavior analysis of the stiffened composite plate with piezoelectric patches under airflow by finite element method and experimental study. The first-order shear deformation plate theory and nine-noded isoparametric piezoelectric laminated plate finite element with five elastic degrees of freedom at each node and one electric degree of ...
Get PriceThis study is devoted to numerical and experimental investigations about the influence of an electrical discharge over a flat plate immersed in a rarefied Mach 2 airflow. Regarding the experimental work, a negative dc discharge is created by applying a potential difference gap between two spanwise aluminum electrodes flush mounted on the plate. The electrode placed close to the leading edge is ...
Get PriceIn order to conduct in-depth researches on rationality of air conditioning system equipment of a high-speed train as well as its pipeline system design, working conditions of the air conditioning system and distribution of aerodynamic characteristics including pressure, velocity and temperature in high speed trains should be computed carefully at the design stage.
Get PriceQili, W., Binbin, J., Mingquan, Y. et al. Numerical simulation of the flow and erosion behavior of exhaust gas and particles in polysilicon reduction furnace. Sci Rep 10, 1909 (2020). https://doi ...
Get PriceResponsible for more than 1.5 × 10 6 deaths worldwide during 2020, the recent COVID-19 pandemic has made evident the need to better understand how airborne infectious diseases spread among individuals. It is an accepted scientific fact that flow physics plays a central role in the transmission of the SARS-CoV-2 virus (Severe Acute Respiratory Syndrome CoronaVirus), responsible for COVID-19 ...
Get PriceNumerical investigation of the breakup behavior of an oscillating two-phase jet ... “ A digital filter based generation of inflow data for spatially developing direct numerical or large eddy simulations,” J. Comput. Phys. ... “ Experimental and numerical study of the turbulence characteristics of airflow around a research vessel,” J ...
Get PriceNumerical tool comes in handy to investigate and optimize the flow through the check valve. In this investigation, transient conditions are identified and simulated to study the airflow and pressure drop through check valve. A check valve sub-system consists of valve body, valve, spring and retainer.
Get PriceThe numerical simulations of human sniffing described above, however, reveal that the odorant mass transport onto the olfactory mucosa during sniffing (turbulent airflow) is remarkably similar to that which occurs during resting breathing (i.e., laminar airflow) if the total flow rate is the same in both conditions.
Get PriceNumerical simulation of the airflow over a military aircraft with active intake T Triantafyllou, T Nikolaidis, M Diakostefanis, and P Pilidis Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 2016 231 : 8 , 1369-1390
Get PriceThe paper established a computational model of aerodynamic noises for 3-train formation including 3 trains, 6 bogies and 2 windshields. Based on Lighthill acoustic theories, a wideband noise source model was used to recognize the aerodynamic noise source of the high-speed train. Aerodynamic pressures of the high-speed train were extracted and compared with experimental results.
Get PriceBy using direct numerical simulation (DNS), Lin et al. [35] compared two different airway models, one of which was from the mouth up to generation 6 and the other started from the trachea. They concluded that the second model that lacked upper airway could not provide a realistic airflow field in the lung. Thus, to reliably estimate the amount
Get Priceyears of CPU time in a super computer to solve a meaningful problem of airflow in and around buildings. Therefore, the computer capacity is still far too small and the computer speed is far too slow with the direct numerical simulation method. RANS modeling requires little computing time and is the most commonly used method to
Get PriceThis study is devoted to numerical and experimental investigations about the influence of an electrical discharge over a flat plate immersed in a rarefied Mach 2 airflow. Regarding the experimental work, a negative dc discharge is created by applying a potential difference gap between two spanwise aluminum electrodes flush mounted on the plate. The electrode placed close to the leading edge is ...
Get PriceNumerical simulation by CFD, validation, air conditioning, interior air flow, thermal comfort, railway rolling stock ... airflow to be inhomogeneous and turbulent along the nozzle (but was taken constant in the simulation) a good quantitative prediction of local flow fields was difficult, although. the global behaviour of the flow field was ...
Get Price3. Results and discussion. The boundary conditions play an important role in the flow simulation. In the experiments, a nozzle was a xed to the inlet of the model to decrease inlet losses and dampen out any external instabilities (Johnstone 2003).The use of a nozzle ensures virtually uniform inlet conditions at all flow rates, producing nearly plug flow (i.e. “top hat”) inlet velocity ...
Get PriceThe numerical simulations of human sniffing described above, however, reveal that the odorant mass transport onto the olfactory mucosa during sniffing (turbulent airflow) is remarkably similar to that which occurs during resting breathing (i.e., laminar airflow) if the total flow rate is the same in both conditions.
Get PriceBy using direct numerical simulation (DNS), Lin et al. [35] compared two different airway models, one of which was from the mouth up to generation 6 and the other started from the trachea. They concluded that the second model that lacked upper airway could not provide a realistic airflow field in the lung. Thus, to reliably estimate the amount
Get PriceNumerical investigation of the breakup behavior of an oscillating two-phase jet ... “ A digital filter based generation of inflow data for spatially developing direct numerical or large eddy simulations,” J. Comput. Phys. ... “ Experimental and numerical study of the turbulence characteristics of airflow around a research vessel,” J ...
Get Pricegives an overview of the numerical model and the computation of turbulence intensity. Section 3 provides the simulation results of two typical cases of terrain-disrupted airflow at HKIA, namely, easterly wind in a stable boundary layer in spring-time and southeasterly flow associated with a tropical cyclone.
Get PriceNumerical tool comes in handy to investigate and optimize the flow through the check valve. In this investigation, transient conditions are identified and simulated to study the airflow and pressure drop through check valve. A check valve sub-system consists of valve body, valve, spring and retainer.
Get Price1 On CFD simulation of wind-induced airflow in narrow ventilated facade cavities: coupled and decoupled simulations and modelling limitations K. Nore (a,b), B. Blocken (c) ∗, J.V. Thue (a) (a) Department of Civil and Transport Engineering, Norwegian University of Science and Technology
Get Pricenumerical model validation. The following paper describes a validation study in which the thermal effects within the vicinity of a single block building with leeward wall heating has been modelled physically and reproduced numerically in a micro-scale model. A three-dimensional numerical simulation (using CFD code CHENSI) of airflow
Get PriceThis study is devoted to numerical and experimental investigations about the influence of an electrical discharge over a flat plate immersed in a rarefied Mach 2 airflow. Regarding the experimental work, a negative dc discharge is created by applying a potential difference gap between two spanwise aluminum electrodes flush mounted on the plate. The electrode placed close to the leading edge is ...
Get Price