Log in

Relevant bibliographies by topics / Volumetric efficiency modeling / Journal articles

To see the other types of publications on this topic, follow the link: Volumetric efficiency modeling.

Journal articles on the topic 'Volumetric efficiency modeling'

Author: Grafiati

Published: 4 June 2021

Last updated: 13 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Volumetric efficiency modeling.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Leontiev, Aleksandr. "Physical modeling of a skip pneumatic winder." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, no. 4 (June 25, 2021): 64–73. http://dx.doi.org/10.21440/0536-1028-2021-4-64-73.

Full text

Abstract:

Introduction. The analytical phase of research on mine skip pneumatic winders has been passed, so the theoretical provisions have to be tested by the methods of physical modeling which is aimed at confirming the mathematical model adequacy and assessing the effectiveness of different types of sealing devices. Research methods. Physical modeling phases have been formulated, including modeling by geometric and aerodynamic similarity criteria, constructing aerodynamic characteristics of the installation, carrying out experiments with non-contacting and combined seals, and calculating the values o

APA, Harvard, Vancouver, ISO, and other styles

2

Skocypec, R. D., R. F. Boehm, and J. M. Chavez. "Heat Transfer Modeling of the IEA/SSPS Volumetric Receiver." Journal of Solar Energy Engineering 111, no. 2 (1989): 138–43. http://dx.doi.org/10.1115/1.3268299.

Full text

Abstract:

During the summer and fall of 1987 in Almeria, Spain, a wire-pack receiver was tested by the International Energy Agency/Small Solar Power Systems (IEA/SSPS). The basic operation of the receiver is that: air is drawn through several layers of stainless steel wire screen; concentrated solar flux is directed on the face of the screen pack; the oxidized wires absorb the solar energy; and heat is transferred to the air flowing through the screen. Although the experiment goal was strictly proof-of-concept and was not receiver characterization, modeling efforts were initiated to help understand the

APA, Harvard, Vancouver, ISO, and other styles

3

Huang, Yu, Jian Ruan, Yong Chen, Chuan Ding, and Sheng Li. "Research on the Volumetric Efficiency of 2D Piston Pumps with a Balanced Force." Energies 13, no. 18 (2020): 4796. http://dx.doi.org/10.3390/en13184796.

Full text

Abstract:

Axial piston pumps with high rotational speeds are required in many fields to increase the power-to-weight ratio. However, three main sliding friction pairs in the pump restrict the increase in rotational speed. To solve this problem, we propose a 2D piston pump with a balanced force that contains a sliding friction pair. Firstly, the mechanical structure and working principle of the pump are described. Then, the pump volumetric efficiency is studied by mathematical modeling, and volumetric losses containing backflow and leakage are analyzed and discussed from the perspectives of load pressure

APA, Harvard, Vancouver, ISO, and other styles

4

Merala, Raymond, Mont Hubbard, and Takashi Miyano. "Modeling and Simulation of a Supercharger." Journal of Dynamic Systems, Measurement, and Control 110, no. 3 (1988): 316–23. http://dx.doi.org/10.1115/1.3152688.

Full text

Abstract:

A dynamic model is developed for simulating and predicting performance for superchargers of relatively arbitrary geometric configuration. A thermodynamic control volume approach and bond graph models are used to derive continuity and energy equations linking the various control volumes. Bond graphs also serve to study and understand the causal implications of laws governing flows between control volumes and system dynamics. Heat transfer is neglected. Simulation outputs include time histories of pressure, temperature, mass, and energy associated with each control volume, time histories of the

APA, Harvard, Vancouver, ISO, and other styles

5

Doron, P., and A. Kribus. "The Effect of Irradiation Directional Distribution on Absorption in Volumetric Solar Receivers." Journal of Solar Energy Engineering 119, no. 1 (1997): 68–73. http://dx.doi.org/10.1115/1.2871849.

Full text

Abstract:

Volumetric solar absorbers are designed to enable the penetration of radiation deep into the absorber in order to improve the efficiency of the energy transfer from incoming radiation to the working fluid. The design of such absorbers is usually based on the irradiation energy flux distribution. We show that the directional features of the irradiation also affect the absorption characteristics of volumetric absorbers, present criteria for the characterization of directional attributes, and describe a method for their calculation. The significance of the directional data is demonstrated for two

APA, Harvard, Vancouver, ISO, and other styles

6

Ghajar, Mostafa, Amir Hasan Kakaee, and Behrooz Mashadi. "Semi-empirical modeling of volumetric efficiency in engines equipped with variable valve timing system." Journal of Central South University 23, no. 12 (2016): 3132–42. http://dx.doi.org/10.1007/s11771-016-3379-3.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Yang, Yabin, and Xin Zhou. "A Volumetric Heat Source Model for Thermal Modeling of Additive Manufacturing of Metals." Metals 10, no. 11 (2020): 1406. http://dx.doi.org/10.3390/met10111406.

Full text

Abstract:

In additive manufacturing of metallic materials, an accurate description of the thermal histories of the built part is important for further analysis of the distortions and residual stresses, which is a big issue for additively manufactured metal products. In the present paper, a computationally volumetric heat source model based on a semianalytical thermal modeling approach is proposed. The proposed model is applied to model the thermal response during a selective laser melting (SLM) process. The interaction between the laser and the material is described using a moving volumetric heat source

APA, Harvard, Vancouver, ISO, and other styles

8

Hellmuth, T. E., and L. K. Matthews. "Modeling and Optimum Design of a Wire Mesh Solar Volumetric Air Receiver." Journal of Solar Energy Engineering 119, no. 3 (1997): 208–13. http://dx.doi.org/10.1115/1.2888020.

Full text

Abstract:

This paper describes the development of a computer model to predict the performance of a discrete layer wire mesh solar volumetric air receiver. The model accounts for all important energy transfer processes within the absorber and allows for the use of two different types of wire mesh screens. Model predictions are compared to experimental results for validation purposes. An optimum design analysis is performed to determine optimum receiver characteristics and performance. Results show a predicted efficiency in the range of 89 percent to 87 percent when the outlet air temperature is between 7

APA, Harvard, Vancouver, ISO, and other styles

9

Cascaval, Dan, Corneliu Oniscu, Anca-Irina Galaction, and Fiorina Ungureanu. "Modeling of mixing for stirred bioreactors: 3. Mixing time for aerated simulated broths." Chemical Industry 56, no. 12 (2002): 506–13. http://dx.doi.org/10.2298/hemind0212506c.

Full text

Abstract:

This paper presents the experiments on mixing efficiency for aerated media for a laboratory stirred bioreactor with a double turbine impeller. The effects of stirrer rotation speed, air volumetric flow rate and stirrer position on the shaft on mixing time for aerated water and simulated broths (CMCNa solutions) were analyzed. Compared to non-aerated broths, the results indicated that the variation of mixing time with the considered parameters is very different, due to the complex flow mechanism of the gas-liquid dispersion, a mechanism which is changed by changing the broth properties or ferme

APA, Harvard, Vancouver, ISO, and other styles

10

Ko, Eunhee, and Jungsoo Park. "Diesel Mean Value Engine Modeling Based on Thermodynamic Cycle Simulation Using Artificial Neural Network." Energies 12, no. 14 (2019): 2823. http://dx.doi.org/10.3390/en12142823.

Full text

Abstract:

This study aims to construct a reduced thermodynamic cycle model with high accuracy and high model execution speed based on artificial neural network training for real-time numerical analysis. This paper proposes a method of constructing a fast average-value model by combining a 1D plant model and exhaust gas recirculation (EGR) control logic. The combustion model of the detailed model uses a direct-injection diesel multi-pulse (DI-pulse) method similar to diesel combustion characteristics. The DI-pulse combustion method divides the volume of the cylinder into three zones, predicting combustio

APA, Harvard, Vancouver, ISO, and other styles

11

Hill, David J., and Jeffrey J. Defoe. "Innovations in Body Force Modeling of Transonic Compressor Blade Rows." International Journal of Rotating Machinery 2018 (July 9, 2018): 1–12. http://dx.doi.org/10.1155/2018/6398501.

Full text

Abstract:

Aeroengine fans and compressors increasingly operate subject to inlet distortion in the transonic flow regime. In this paper, innovations to low-order numerical modeling of fans and compressors via volumetric source terms (body forces) are presented. The approach builds upon past work to accommodate any axial fan/compressor geometry and ensures accurate work input and efficiency prediction across a range of flow coefficients. In particular, the efficiency drop-off near choke is captured. The model for a particular blade row is calibrated using data from single-passage bladed computations. Comp

APA, Harvard, Vancouver, ISO, and other styles

12

Clark, Sarah A., Matthew J. Pranter, Rex D. Cole, and Zulfiquar A. Reza. "Fluvial architecture of the Burro Canyon Formation using unmanned aerial vehicle-based photogrammetry and outcrop-based modeling: Implications for reservoir performance, Escalante Canyon, southwestern Piceance Basin, Colorado." Interpretation 6, no. 4 (2018): T1117—T1139. http://dx.doi.org/10.1190/int-2018-0091.1.

Full text

Abstract:

The Cretaceous Burro Canyon Formation in the southern Piceance Basin, Colorado, represents low sinuosity to sinuous braided fluvial deposits that consist of amalgamated channel complexes, amalgamated and isolated fluvial-bar channel fills, and floodplain deposits. Lithofacies primarily include granule-cobble conglomerates, conglomeratic sandstones, cross-stratified sandstones, upward-fining sandstones, and gray-green mudstones. To assess the effects of variable sandstone-body geometry and internal lithofacies and petrophysical heterogeneity on reservoir performance, conventional field methods

APA, Harvard, Vancouver, ISO, and other styles

13

Akmalov, A. E., G. E. Kotkovskii, S. V. Stolyarov, et al. "High-performance aerosol sampler with liquid phase recirculation and pre-concentration of particles." Bulletin of Russian State Medical University, no. (4)2018 (October 5, 2018): 25–31. http://dx.doi.org/10.24075/brsmu.2018.049.

Full text

Abstract:

Testing the surrounding environment for the presence of biogenic aerosols is crucial in ensuring its safety for the population. It is often necessary to collect aerosol samples from large areas in short time, which demands excellent particle collection efficiency, a sufficient incoming air flow rate and a capacity to maintain the viability of the collected samples. Below we present the aerosol sampler with a high volumetric flow rate based on a two-stage particle concentration algorithm and consisting of a virtual impactor and a cyclone concentrator with a recirculating liquid phase. We provid

APA, Harvard, Vancouver, ISO, and other styles

14

V. Telegin, I., I. M. Volodin, and P. I. Zolotukhin. "The mathematical modeling for assessing the effectiveness of hot forging extruded round in plan forgings on crank presses." International Journal of Engineering & Technology 7, no. 2.2 (2018): 30. http://dx.doi.org/10.14419/ijet.v7i2.2.9896.

Full text

Abstract:

The article presents the results of the development of a mathematical model for calculating the efficiency indices of technological schemes for hot volumetric stamping (GOSH) on crank hot-stamping presses (KGSHP) round in the forgings plan (for gear, pulley and other similar parts). Software solutions obtained on the basis of this model allow choosing from several variants of technological schemes the most effective for using it in production or further improvement.

APA, Harvard, Vancouver, ISO, and other styles

15

Costa, Lorena Vila Bela, and Willames de Albuquerque Soares. "Avaliações de Funções de Pedotransferência para Solos Brasileiros." Revista Brasileira de Geografia Física 14, no. 4 (2021): 2028–41. http://dx.doi.org/10.26848/rbgf.v14.4.p2028-2041.

Full text

Abstract:

Pedotransfer Functions (FPT) are mathematical models that estimate difficult-to-measure soil properties through more accessible variables, generating optimization of time and financial resources. In this study, six Pedotransfer Functions, based on the equation of Van Genuchten, analyzed for the prediction of volumetric moisture of Brazilian soils, with data from the global database Soil Data Task. Applied for pressures of 0, 0.01, 0.03, 0.10, 0.20, 0.50, 2.50 and 15.0 bar, the resulting values of the equations were compared with the measured volumetric moistures through five statistical parame

APA, Harvard, Vancouver, ISO, and other styles

16

MARCHENKO, MAKSYM, VIACHESLAV KHARZHEVSKYI, OLHA KOROTYCH, and VLADYSLAV HERASYMENKO. "MODELING AND OPTIMIZATION OF THE PROCESS OF AIR PURIFICATION FROM GRAIN DUST BY MEANS OF COMPUTATIONAL FLUID DYNAMICS." HERALD OF KHMELNYTSKYI NATIONAL UNIVERSITY 297, no. 3 (2021): 100–104. http://dx.doi.org/10.31891/2307-5732-2021-297-3-100-104.

Full text

Abstract:

The article is dedicated to the development of generalized methods of calculation, modeling and optimization of the cyclones’ parameters that are used to clean the air from the grain dust. The basis of the developed methods is the usage of computational hydraulic gas dynamics, in particular the SOLIDWORKS software package and the integrated CFD-package SOLIDWORKS Flow Simulation, as well as the principles of theory of similarity and dimensions. The deposition efficiency coefficient was chosen as the optimization criterion that can be calculated as the ratio of the mass of deposited particles t

APA, Harvard, Vancouver, ISO, and other styles

17

Lobsinger, Thomas, Timm Hieronymus, and Gunther Brenner. "A CFD Investigation of a 2D Balanced Vane Pump Focusing on Leakage Flows and Multiphase Flow Characteristics." Energies 13, no. 13 (2020): 3314. http://dx.doi.org/10.3390/en13133314.

Full text

Abstract:

Vane pumps are often applied in automatic transmission systems of vehicles. Future applications require the oil pumps to be more efficient and to be able to handle multiphase flow pumping situations to a certain extend. To fulfill these requirements, efficient development tools are needed. Therefore, a less demanding computational 2D model of a fixed-type balanced vane pump was derived and numerically analyzed with the commercial computational fluid dynamics (CFD) software ANSYS CFX. The meshing of the rotating parts was done with TwinMesh, using a moving mesh approach. At first, a mesh conver

APA, Harvard, Vancouver, ISO, and other styles

18

Feng, Jianmei, Linfen Xing, Bingqi Wang, Huan Wei, and Ziyi Xing. "Effects of Working Fluids on the Performance of a Roots Pump for Hydrogen Recirculation in a PEM Fuel Cell System." Applied Sciences 10, no. 22 (2020): 8069. http://dx.doi.org/10.3390/app10228069.

Full text

Abstract:

In this paper, the performance of a Roots pump for hydrogen recirculation in proton exchange membrane (PEM) fuel cell system is simulated based on CFD modeling. The Roots pump is in a three-lobe configuration with helical rotors, and it is developed specifically for fuel cell systems between 60 to 110 kW. A three-dimensional model of the Roots pump is established to predict the pump performance, including the flow rate and power consumption under various operating conditions. Extensive simulations were conducted and then verified experimentally by operating with working fluids of air and heliu

APA, Harvard, Vancouver, ISO, and other styles

19

Gan, R., and Y. Luo. "Using the nonlinear aquifer storage–discharge relationship to simulate the base flow of glacier- and snowmelt-dominated basins in northwest China." Hydrology and Earth System Sciences 17, no. 9 (2013): 3577–86. http://dx.doi.org/10.5194/hess-17-3577-2013.

Full text

Abstract:

Abstract. Base flow is an important component in hydrological modeling. This process is usually modeled by using the linear aquifer storage–discharge relation approach, although the outflow from groundwater aquifers is nonlinear. To identify the accuracy of base flow estimates in rivers dominated by snowmelt and/or glacier melt in arid and cold northwestern China, a nonlinear storage–discharge relationship for use in SWAT (Soil Water Assessment Tool) modeling was developed and applied to the Manas River basin in the Tian Shan Mountains. Linear reservoir models and a digital filter program were

APA, Harvard, Vancouver, ISO, and other styles

20

Guo, Yuan, Yinchuan Zeng, Liandong Fu, and Xinyuan Chen. "Modeling and Experimental Study for Online Measurement of Hydraulic Cylinder Micro Leakage Based on Convolutional Neural Network." Sensors 19, no. 9 (2019): 2159. http://dx.doi.org/10.3390/s19092159.

Full text

Abstract:

Internal leakage is the most common failure of hydraulic cylinder; when it increases, it decreases volumetric efficiency, pressure and speed of the hydraulic cylinder, and can seriously affect the normal operation of the hydraulic cylinder, so it is important to measure it, especially to measure it online. Firstly, the principle of internal leakage online measurement is proposed, including the online measurement system, the fixed mode of the strain gauge and the mathematical model of the flow-strain signal conversion. Secondly, an experimental system is established to collect internal leakages

APA, Harvard, Vancouver, ISO, and other styles

21

Zhang, G. Q., and D. N. Assanis. "Manifold Gas Dynamics Modeling and Its Coupling With Single-Cylinder Engine Models Using Simulink." Journal of Engineering for Gas Turbines and Power 125, no. 2 (2003): 563–71. http://dx.doi.org/10.1115/1.1560708.

Full text

Abstract:

A flexible model for computing one-dimensional, unsteady manifold gas dynamics in single-cylinder spark-ignition and diesel engines has been developed. The numerical method applies an explicit, finite volume formulation and a shock-capturing total variation diminishing scheme. The numerical model has been validated against the method of characteristics for valve flows without combustion prior to coupling with combustion engine simulations. The coupling of the gas-dynamics model with single-cylinder, spark-ignition and diesel engine modules is accomplished using the graphical MATLAB-SIMULINK en

APA, Harvard, Vancouver, ISO, and other styles

22

Petraikin, A. V., K. A. Sergunova, D. S. Semenov, et al. "Dynamic Phantom for Flow Model in Magnetic Resonance Angiography." Medical Visualization, no. 6 (December 28, 2017): 130–39. http://dx.doi.org/10.24835/1607-0763-2017-6-130-139.

Full text

Abstract:

Purpose. To develop phantom for flow modeling in magnetic resonance angiography (MRA): relative contrast assessment, accuracy of the linear velocity and volumetric flow, what improve accuracy of diagnostic in cardiac and neurosurgical clinics (quality assessment of blood and cerebrospinal fluid motion). To compare scanners of different manufactures in points of the MRA efficiency using the developed phantom.Materials and methods. The main part of dynamic phantom consists of a disc filled with agarose gel (for linear and volumetric velocity control) and silicone tubes for fluid flow modelling.

APA, Harvard, Vancouver, ISO, and other styles

23

Bishara, Dana, and Mahmood Jabareen. "A reduced mixed finite-element formulation for modeling the viscoelastic response of electro-active polymers at finite deformation." Mathematics and Mechanics of Solids 24, no. 5 (2018): 1578–610. http://dx.doi.org/10.1177/1081286518802419.

Full text

Abstract:

In this work, a parameter identification procedure has been held for characterizing the widely used dielectric elastomer VHB. The calibration procedure has been performed using various experimental data found in previous works including uniaxial and multiaxial tests. Unlike the uniaxial tests, the multiaxial tests yield inhomogeneous deformation fields and, therefore, the finite-element method is adopted to obtain numerical solutions for the multiaxial tests. Here, a numerical scheme has been developed using the reduced mixed finite-element formulation, which eliminates the possible volumetric

APA, Harvard, Vancouver, ISO, and other styles

24

Shargh, Mahdie, and Mohammad A. Behnajady. "A high-efficient batch-recirculated photoreactor packed with immobilized TiO2-P25 nanoparticles onto glass beads for photocatalytic degradation of phenazopyridine as a pharmaceutical contaminant: artificial neural network modeling." Water Science and Technology 73, no. 11 (2016): 2804–14. http://dx.doi.org/10.2166/wst.2016.132.

Full text

Abstract:

In this study, removal efficiency of phenazopyridine (PhP) as a model pharmaceutical contaminant was investigated in a batch-recirculated photoreactor packed with immobilized TiO2-P25 nanoparticles on glass beads. Influence of various operational parameters such as irradiation time, initial concentration of PhP, volume of solution, volumetric flow rate, pH and power of light source was investigated. Results indicated that removal percentage increases with the rise of irradiation time, volumetric flow rate and power of light source but decreases with the rise of initial concentration of PhP and

APA, Harvard, Vancouver, ISO, and other styles

25

Huang, Tsung-Hui, Jiun-Shyan Chen, Michael R. Tupek, Frank N. Beckwith, Jacob J. Koester, and H. Eliot Fang. "A variational multiscale immersed meshfree method for heterogeneous materials." Computational Mechanics 67, no. 4 (2021): 1059–97. http://dx.doi.org/10.1007/s00466-020-01968-1.

Full text

Abstract:

AbstractWe introduce an immersed meshfree formulation for modeling heterogeneous materials with flexible non-body-fitted discretizations, approximations, and quadrature rules. The interfacial compatibility condition is imposed by a volumetric constraint, which avoids a tedious contour integral for complex material geometry. The proposed immersed approach is formulated under a variational multiscale based formulation, termed the variational multiscale immersed method (VMIM). Under this framework, the solution approximation on either the foreground or the background can be decoupled into coarse-

APA, Harvard, Vancouver, ISO, and other styles

26

Vadood, M., M. S. Johari, and A. R. Rahai. "A New Approach for Simulation of Hot Mix Asphalt; Numerical and Experimental." Journal of Mechanics 31, no. 6 (2015): 701–11. http://dx.doi.org/10.1017/jmech.2015.36.

Full text

Abstract:

ABSTRACTIn this study a novel approach for 3D modeling of cylindrical sample of hot mix asphalt (HMA) is presented. To this end, the cylindrical sample was divided into several slices and using a developed algorithm the processed images were extended to 3D volumetric objects to reconstruct the 3D microstructure of HMA. To evaluate the efficiency of the presented 3D model for prediction of mechanical behavior, HMA was regarded as a two-phase mixture; mastic phase and aggregate phase. The asphalt binder, filler, air voids and fine aggregates were considered as mastic with viscoelastic behavior a

APA, Harvard, Vancouver, ISO, and other styles

27

Casula, Laura, Guglielmo D’Amico, Giovanni Masala, and Filippo Petroni. "Performance estimation of photovoltaic energy production." Letters in Spatial and Resource Sciences 13, no. 3 (2020): 267–85. http://dx.doi.org/10.1007/s12076-020-00258-x.

Full text

Abstract:

AbstractThis article deals with the production of energy through photovoltaic (PV) panels. The efficiency and quantity of energy produced by a PV panel depend on both deterministic factors, mainly related to the technical characteristics of the panels, and stochastic factors, essentially the amount of incident solar radiation and some climatic variables that modify the efficiency of solar panels such as temperature and wind speed. The main objective of this work is to estimate the energy production of a PV system with fixed technical characteristics through the modeling of the stochastic facto

APA, Harvard, Vancouver, ISO, and other styles

28

Piekutin, Janina, and Urszula Kotowska. "Model of Hydraulic Resistance When Forecasting Reverse Osmosis in Water Treatment." Membranes 11, no. 5 (2021): 314. http://dx.doi.org/10.3390/membranes11050314.

Full text

Abstract:

The article presents research on the treatment of infiltration water with increased ammonium ion and nitrate(V) content through reverse osmosis. Then, research was conducted on the phenomena related to the decrease in the permeability of the membrane used for the research. The search for an appropriate interpretation of the phenomena was carried out using mathematical modeling. Based on the assumptions of the hydraulic model of the filtration resistance, calculations were made to forecast the efficiency of the osmotic membrane used in the discussed process. For this purpose, the following indi

APA, Harvard, Vancouver, ISO, and other styles

29

Alnaimat, Fadi, Bobby Mathew, and Ali Hilal-Alnaqbi. "Modeling a Dielectrophoretic Microfluidic Device with Vertical Interdigitated Transducer Electrodes for Separation of Microparticles Based on Size." Micromachines 11, no. 6 (2020): 563. http://dx.doi.org/10.3390/mi11060563.

Full text

Abstract:

This article conceptualizes and mathematically models a dielectrophoretic microfluidic device with two sets of interdigitated transducer vertical electrodes for separation of a binary heterogeneous mixture of particles based on size; each set of electrodes is located on the sidewalls and independently controllable. To achieve separation in the proposed microfluidic device, the small microparticles are subjected to positive dielectrophoresis and the big microparticles do not experience dielectrophoresis. The mathematical model consists of equations describing the motion of each microparticle, f

APA, Harvard, Vancouver, ISO, and other styles

30

Howard, Samuel Sami. "Numerical Modeling Prediction of Thermal Storage during Discharging Phase, PV- Thermal Solar and with Nanofluids." Journal of Technology Innovations in Renewable Energy 10 (March 3, 2021): 1–18. http://dx.doi.org/10.6000/1929-6002.2021.10.01.

Full text

Abstract:

This study is intended to present a numerical model that was established after the energy conservation equations coupled with the heat transfer equations to predict the discharge behavior of different phase change materials, paraffin under the effect of different operating conditions such as solar radiation, heat transfer fluid, using nanofluids; AI2O3, CuO, Fe304 and SiO2, at different concentrations, and heat transfer fluid temperatures. Besides, the effect of the aforementioned operating conditions on the thermal storage process using PV-Thermal hybrid system and the thermal energy conversi

APA, Harvard, Vancouver, ISO, and other styles

31

Yan, Di, Qian Tang, Ahmed Kovacevic, et al. "Designing nano-aluminum laden fuel pump for aviation applications." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 234, no. 6 (2020): 634–43. http://dx.doi.org/10.1177/0954408920935315.

Full text

Abstract:

In view of the fact that traditional liquid propellants cannot meet the design requirements of large-thrust flight vehicle, it has become a new trend to add nano-metal powder to liquid propellants to greatly increase density and specific impulse. In order to achieve the variable flow-rate and variable-proportion transportation of aviation fuel with nano-aluminum, a new type of solid-liquid mixing pumping system is designed, including powder conveying device, stirring device, pump and corresponding drive and transmission system. For the purpose of avoiding the frictional contact between the rot

APA, Harvard, Vancouver, ISO, and other styles

32

Natvig, J. R. R., B. Skaflestad, F. Bratvedt, et al. "Multiscale Mimetic Solvers for Efficient Streamline Simulation of Fractured Reservoirs." SPE Journal 16, no. 04 (2011): 880–88. http://dx.doi.org/10.2118/119132-pa.

Full text

Abstract:

Summary Advances in reservoir characterization and modeling have given the industry improved ability to build detailed geological models of petroleum reservoirs. These models are characterized by complex shapes and structures with discontinuous material properties that span many orders of magnitude. Models that represent fractures explicitly as volumetric objects pose a particular challenge to standard simulation technology with regard to accuracy and computational efficiency. We present a new simulation approach based on streamlines in combination with a new multiscale mimetic pressure solver

APA, Harvard, Vancouver, ISO, and other styles

33

Gao, Pei, Xue Lei Zhang, and Xin Wei Yu. "The Effects of Environment Wind on Heat Transfer Performance of Direct Air Cooled Island and its Improvements." Advanced Materials Research 753-755 (August 2013): 2752–56. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.2752.

Full text

Abstract:

Using a CFD software, the numerical simulation of a 2×300MW direct air-cooled unit is done by multi-stage modeling method. the effect of the environmental wind on the heat-exchanging performance of the air-cooling island is analyzed by numerical simulation. The effects of different wind velocities and directions on exterior flow field and heat-exchanging efficiency are analyzed. The reasons of hot air recirculation and the decrease of the fans’ output are found. The heat transfer performance of air-cooled island is affected after the installation of windproof net. The result shows that the for

APA, Harvard, Vancouver, ISO, and other styles

34

Rollin, Joseph A., Julia Martin del Campo, Suwan Myung, et al. "High-yield hydrogen production from biomass by in vitro metabolic engineering: Mixed sugars coutilization and kinetic modeling." Proceedings of the National Academy of Sciences 112, no. 16 (2015): 4964–69. http://dx.doi.org/10.1073/pnas.1417719112.

Full text

Abstract:

The use of hydrogen (H2) as a fuel offers enhanced energy conversion efficiency and tremendous potential to decrease greenhouse gas emissions, but producing it in a distributed, carbon-neutral, low-cost manner requires new technologies. Herein we demonstrate the complete conversion of glucose and xylose from plant biomass to H2 and CO2 based on an in vitro synthetic enzymatic pathway. Glucose and xylose were simultaneously converted to H2 with a yield of two H2 per carbon, the maximum possible yield. Parameters of a nonlinear kinetic model were fitted with experimental data using a genetic alg

APA, Harvard, Vancouver, ISO, and other styles

35

Poubeau, Adèle, Arthur Vauvy, Florence Duffour, Jean-Marc Zaccardi, Gaetano de Paola, and Marek Abramczuk. "Modeling investigation of thermal insulation approaches for low heat rejection Diesel engines using a conjugate heat transfer model." International Journal of Engine Research 20, no. 1 (2018): 92–104. http://dx.doi.org/10.1177/1468087418818264.

Full text

Abstract:

Heat losses through combustion chamber walls are a well-known limiting factor for the overall efficiency of internal combustion engines. Thermal insulation of the walls has the potential to decrease substantially these heat losses. However, evaluating numerically the effect of coating and of its location in the combustion chamber and then design an optimized combustion system require the use of high-fidelity engine models. The objective of this article is to present the whole workflow implying the use of three-dimensional computational fluid dynamics techniques with conjugate heat transfer (CH

APA, Harvard, Vancouver, ISO, and other styles

36

White, Jeremy, Victoria Stengel, Samuel Rendon, and John Banta. "The importance of parameterization when simulating the hydrologic response of vegetative land-cover change." Hydrology and Earth System Sciences 21, no. 8 (2017): 3975–89. http://dx.doi.org/10.5194/hess-21-3975-2017.

Full text

Abstract:

Abstract. Computer models of hydrologic systems are frequently used to investigate the hydrologic response of land-cover change. If the modeling results are used to inform resource-management decisions, then providing robust estimates of uncertainty in the simulated response is an important consideration. Here we examine the importance of parameterization, a necessarily subjective process, on uncertainty estimates of the simulated hydrologic response of land-cover change. Specifically, we applied the soil water assessment tool (SWAT) model to a 1.4 km2 watershed in southern Texas to investigat

APA, Harvard, Vancouver, ISO, and other styles

37

Khalil, Lina Ali, and Maysoon Basheer Abid. "Numerical Simulation of Unsaturated Soil Water Flow from a Trickle Point System, Considering Evaporation and Root Water Uptake." Al-Khwarizmi Engineering Journal 14, no. 4 (2018): 103–14. http://dx.doi.org/10.22153/kej.2018.05.005.

Full text

Abstract:

This research was carried out to study the effect of plants on the wetted area for two soil types in Iraq and predict an equation to determine the wetted radius and depth for two different soil types cultivated with different types of plants, the wetting patterns for the soils were predicted at every thirty minute for a total irrigation time equal to 3 hr. Five defferent discharges of emitter and five initial volumetric soil moisture contents were used ranged between field capacity and wilting point were utilized to simulate the wetting patterns. The simulation of the water flow from a single

APA, Harvard, Vancouver, ISO, and other styles

38

Khalil, Lina Ali, and Maysoon Basheer Abid. "Numerical Simulation of Unsaturated Soil Water from a Trickle Irrigation System for Sandy Loam Soils." Journal of Engineering 25, no. 3 (2019): 38–52. http://dx.doi.org/10.31026/j.eng.2019.03.04.

Full text

Abstract:

Trickle irrigation is a system for supplying filtered water and fertilizer directly into the soil and water and it is allowed to dissipate under low pressure in an exact predetermined pattern. An equation to estimate the wetted area of unsaturated soil with water uptake by roots is simulated numerically using the HYDRUS-2D/3D software. In this paper, two soil types, which were different in saturated hydraulic conductivity were used with two types of crops tomato and corn, different values of emitter discharge and initial volumetric soil moisture content were assumed. It was assumed that the wa

APA, Harvard, Vancouver, ISO, and other styles

39

Zhang, Qi, Bin Wen, Xuemei Zhang, Kai Wu, Xinyu Wu, and Yinyou Zhang. "In-Cylinder Oxygen Concentration Estimation Based on Virtual Measurement and Data Fusion Algorithm for Turbocharged Diesel Engines." Applied Sciences 11, no. 16 (2021): 7594. http://dx.doi.org/10.3390/app11167594.

Full text

Abstract:

In-cylinder oxygen concentration (ICOC) is critical for advanced combustion control of internal combustion engines, and is hard to be accessed in commercial measurements. In existing research, ICOC is predicted by conventional dynamical model based on mass/energy conservation, which suffers from uncertainties such as inaccuracy of volumetric efficiency or the error of orifice geometry. In this paper, we enhance the ICOC estimation by implementing two vital strategies. Firstly, we introduce a method called virtual measurement to resist the conventional model uncertainties, in this method we mod

APA, Harvard, Vancouver, ISO, and other styles

40

Prakash, R., and K. J. Kennedy. "Kinetics of an anaerobic fluidized bed reactor using biolite carrier." Canadian Journal of Civil Engineering 23, no. 6 (1996): 1305–15. http://dx.doi.org/10.1139/l96-939.

Full text

Abstract:

Start-up and steady state operation of anaerobic fluidized bed reactors (AFBRs) with biolite as the inert carrier material was studied. Start-up and concomitant biofilm development of AFBRs was performed using two common start-up techniques, the maximum efficiency profile (MEP) technique and the maximum load profile (MLP) technique. The MEP start-up technique increases the volumetric organic loading rates to the reactor gradually and is tied to the removal efficiency of the process. The MLP start-up technique maintains a moderately high but constant volumetric organic loading rate irrespective

APA, Harvard, Vancouver, ISO, and other styles

41

Silich, A. A., and Eh M. Yusupova. "Mathematical model of shaping toothed products using volumetric tool with one motion parameter." Advanced Engineering Research 20, no. 3 (2020): 295–301. http://dx.doi.org/10.23947/2687-1653-2020-20-3-295-301.

Full text

Abstract:

Introduction. The development of a mathematical model of one-parameter shaping of a toothed product is considered. As an example, shaping of the side surface of the teeth of the Novikov gearing is studied; the mode and magnitude of the change in the shaping error heightwise the wheel tooth are shown. The work objective was to develop a mathematical model of the surface of the product teeth as a generating surface envelope of the tool. A computational and experimental study is carried out. The mathematical models obtained can be used in devices with copiers when shaping the side surface of the

APA, Harvard, Vancouver, ISO, and other styles

42

Zhulay, Yu O., and O. D. Nikolayev. "Evaluation of hydraulic power of drilling string with a cavitation hydrovibrator." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 3 (2021): 31–37. http://dx.doi.org/10.33271/nvngu/2021-3/031.

Full text

Abstract:

Purpose. To develop a method for assessing the drill string hydraulic energy based on mathematical modeling of dynamic processes at the drill string with a hydraulic vibrator rock system, taking into account the nonlinear dependence of system dissipative losses on the drill string vibration amplitudes at drill operating modes. Methodology. Methods are based on experimental and theoretical studies on the drill string dynamic parameters and the evaluation of efficiency of converting stationary fluid flow into pulsating flow. Findings. The results are presented in the form of calculated and exper

APA, Harvard, Vancouver, ISO, and other styles

43

Liu, Kan, John R. Phillips, Xiao Sun, Sayeed Mohammad, Raymond L. Huhnke, and Hasan K. Atiyeh. "Investigation and Modeling of Gas-Liquid Mass Transfer in a Sparged and Non-Sparged Continuous Stirred Tank Reactor with Potential Application in Syngas Fermentation." Fermentation 5, no. 3 (2019): 75. http://dx.doi.org/10.3390/fermentation5030075.

Full text

Abstract:

Syngas (mixture of CO, H2 and CO2) fermentation suffers from mass transfer limitation due to low solubility of CO and H2 in the liquid medium. Therefore, it is critical to characterize the mass transfer in syngas fermentation reactors to guide in delivery of syngas to the microorganisms. The objective of this study is to measure and predict the overall volumetric mass transfer coefficient, kLa for O2 at various operating conditions in a 7-L sparged and non-sparged continuous stirred-tank reactor (CSTR). Measurements indicated that the kLa for O2 increased with an increase in air flow rate and

APA, Harvard, Vancouver, ISO, and other styles

44

Shin, Hyunki, Donghyuk Jung, Manbae Han, Seungwoo Hong, and Donghee Han. "Minimization of Torque Deviation of Cylinder Deactivation Engine through 48V Mild-Hybrid Starter-Generator Control." Sensors 21, no. 4 (2021): 1432. http://dx.doi.org/10.3390/s21041432.

Full text

Abstract:

Cylinder deactivation (CDA) is an effective technique to improve fuel economy in spark ignition (SI) engines. This technique enhances volumetric efficiency and reduces throttling loss. However, practical implementation is restricted due to torque fluctuations between individual cylinders that cause noise, vibration, and harshness (NVH) issues. To ease torque deviation of the CDA, we propose an in-cylinder pressure based 48V mild-hybrid starter-generator (MHSG) control strategy. The target engine realizes CDA with a specialized engine configuration of separated intake manifolds to independently

APA, Harvard, Vancouver, ISO, and other styles

45

KAYHKO, JARI, KARI PELTONEN, HEIKKI MUTIKAINEN, et al. "The role of gas dispersion in the oxygen delignification process." May 2021 20, no. 5 (2021): 321–28. http://dx.doi.org/10.32964/tj20.5.321.

Full text

Abstract:

Oxygen delignification is an essential part of the pulp production process. Delignification occurs with the aid of alkali and dissolved oxygen. Dissolved oxygen is obtained by dispersing oxygen gas into the pulp suspension by using efficient mixers. Little is known about the state of oxygen gas dispersion and its effect on oxy-gen delignification kinetics and efficiency. This paper will present the results for the effect of gas bubble size on the performance of oxygen delignification. The results are mainly based on detailed studies made in a Finnish hardwood mill where the oxygen bubble size

APA, Harvard, Vancouver, ISO, and other styles

46

Sapniwat, Sukruthai, and Falan Srisuriyachai. "Effects of Polymer Adsorption and Desorption on Polymer Flooding in Waterflooded Reservoir." International Journal of Research in Science 3, no. 3 (2017): 1. http://dx.doi.org/10.24178/ijrs.2017.3.3.01.

Full text

Abstract:

Polymer Flooding is one of the most well-known methods in Enhanced Oil Recovery (EOR) technology, resulting in favorable conditions for displacement mechanism to lower residual oil in the reservoir. Polymers can lower mobility ratio by increasing the viscosity of injected water, hereby increasing volumetric sweep efficiency. Moreover, polymer adsorption onto the rock surface can help decrease reservoir permeability contrast. Due to absolute permeability reduction, the effective permeability to water is also reduced. Once the polymer is adsorbed onto the rock surface, polymer molecules can be d

APA, Harvard, Vancouver, ISO, and other styles

47

Seeam, Amar, Tianxin Zheng, Yong Lu, Asif Usmani, and David Laurenson. "BIM Integrated Workflow Management and Monitoring System for Modular Buildings." International Journal of 3-D Information Modeling 2, no. 1 (2013): 17–28. http://dx.doi.org/10.4018/ij3dim.2013010103.

Full text

Abstract:

The authors are collaborating with a manufacturer of custom built steel frame modular units which are then transported for rapid erection onsite (volumetric building system). As part of its strategy to develop modular housing, Enemetric, is taking the opportunity to develop intelligent buildings, integrating a wide range of sensors and control systems for optimising energy efficiency and directly monitoring structural health. Enemetric have recently been embracing Building Information Modeling (BIM) to improve workflow, in particular cost estimation and to simplify computer aided manufacture (

APA, Harvard, Vancouver, ISO, and other styles

48

Saquib, A. N., H. M. T. Khaleed, Irfan Anjum Badruddin, et al. "Development of Preform for Simulation of Cold Forging Process of A V8 Engine Camshaft Free from Flash & Under-Filling." Mathematics 7, no. 11 (2019): 1026. http://dx.doi.org/10.3390/math7111026.

Full text

Abstract:

Finite Element Method based techniques apply to a wide spectrum of engineering applications including manufacturing. The flexibility to achieve optimized results by simulations adds another dimension to process-development. The efficiency due to simulation is enhanced many folds for developing desired components by reducing the cost as well as time. This paper investigates cold forging process to be adopted to produce camshafts with a target to minimize flash as well as under filling. These two factors being major problems encountered when cold forging is to be adopted for complex shaped produ

APA, Harvard, Vancouver, ISO, and other styles

49

Sproles, E., A. Nolin, K. Rittger, and T. Painter. "Climate change impacts on maritime mountain snowpack in the Oregon Cascades." Hydrology and Earth System Sciences Discussions 9, no. 11 (2012): 13037–81. http://dx.doi.org/10.5194/hessd-9-13037-2012.

Full text

Abstract:

Abstract. Globally maritime snow comprises 10% of seasonal snow and is considered highly sensitive to changes in temperature. This study investigates the effect of climate change on maritime mountain snowpack in the McKenzie River Basin (MRB) in the Cascades Mountains of Oregon, USA. Melt water from the MRB's snowpack provides critical water supply for agriculture, ecosystems, and municipalities throughout the region especially in summer when water demand is high. Because maritime snow commonly falls at temperatures close to 0 °C, accumulation of snow versus rainfall is highly sensitive to tem

APA, Harvard, Vancouver, ISO, and other styles

50

Ivanova, A. A., M. G. Berengarten, and M. A. Bulatov. "Modeling of regeneration process of oil contaminated quartz sand with water solution of natural surfactant in vibratory fluidized bed." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 3 (2019): 197–202. http://dx.doi.org/10.20914/2310-1202-2019-3-197-202.

Full text

Abstract:

The development of new and modernization of existing technological systems aimed at increasing the efficiency of treatment of surface storm water and industrial wastewater is an important area. Since individual objects are connected to each other in wastewater treatment systems, a change in the operation parameters of one of them will affect the others. For example, carrying out the correct effective regeneration of the quick filter, selected for a certain grade of filter material and the type of pollution, will relieve the work of the treatment plant as a whole. The actual direction is the in

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!