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排序方式: 共有48条查询结果,搜索用时 15 毫秒
1.
Hyun Kyu Suh 《Fuel》2008,87(6):925-932
This paper investigates the effect of injection parameters on the characteristics of dimethyl ether (DME) as an alternative fuel in a diesel engine with experimental and analytical models based on empirical equations. In order to study macroscopic and microscopic characteristics of DME fuel, this work focuses on the atomization characteristics of DME and compares experimental and predicted results for spray development obtained by empirical models for diesel and DME fuel. Detailed comparisons of spray tip penetration from three different empirical correlations and from visualization experiments of diesel and DME fuels were conducted under various fuel injection conditions. In comparison with the results of different empirical equations for measured spray tip penetration, the experimental results of this study provide good agreement with the calculation results based on empirical equations, except during the earliest stage of the injected spray sequence. The results of atomization characteristics indicate that DME showed better spray characteristics than conventional diesel fuel. Also, the fuel injection delay and maximum injection rate of DME fuel are shorter and lower than those of diesel fuel at the same injection conditions, respectively. 相似文献
2.
MCM-41 materials were synthesized using alkyl(decosane, dodecyl)trimethyl ammonium bromide as structure directing surfactants. X-ray diffraction (XRD) analysis and nitrogen adsorption measurements reveal that the pores are hexagonal with tunable textural properties through the choice of surfactant and experimental condition. Poly(diphenylamine), PDPA was entrapped into the pores of MCM-41 by initial sorption of diphenylamine (DPA, monomer) in a medium (napthalein sulfonic acid) that provides self-assembling of DPA inside the pores and subsequent oxidative of polymerization with peroxydisulphate. Clear presence of an additional peak (around 9-10°) in XRD pattern for the DPA loaded MCM-41 provides evidence for self-assembled structure. Upon polymerization the self-assembly of DPA molecules resulted tubular PDPA inside the pores of MCM-41. PDPA thus formed shows different electronic property than the PDPA prepared by conventional method. XRD and FTIR spectroscopic analysis of PDPA loaded MCM-41 clearly informs that PDPA are entrapped in channels of MCM-41. 相似文献
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Georgina K. SuchAngus P.R. Johnston Kang LiangFrank Caruso 《Progress in Polymer Science》2012,37(7):985-1003
The synthesis of nanoengineered materials with precise control over material composition, architecture and functionality is integral to advances in diverse fields, including biomedicine. Over the last 10 years, click chemistry has emerged as a prominent and versatile approach to engineer materials with specific properties. Herein, we highlight the application of click chemistry for the synthesis of nanoengineered materials, ranging from ultrathin films to delivery systems such as polymersomes, dendrimers and capsules. In addition, we discuss the use of click chemistry for functionalizing such materials, focusing on modifications aimed at biomedical applications. 相似文献
5.
Water spray is the most widely used means of wet dust reduction, and its atomization parameters are directly related to the effect of dust reduction. In order to obtain the atomization properties of solid-cone spray for dust reduction, the paper used droplet velocity and particle size to characterize its atomization characteristics. The Phase Doppler Particle Analyzer (PDPA) was used to precisely measure droplet sizes and velocities of a solid-cone spray at distances of 15?cm, 25?cm and 45?cm horizontally from the nozzle outlet, using low and medium spray pressures. The results show that the droplet size was fluctuant before spray pressure increasing to 2.0?MPa and then decreased gradually with the increasing of spray pressure. The droplet velocity increased with the raising spray pressure and the velocity at 45?cm is the minimum. The droplet size measurements taken 45?cm from the nozzle exhibited more complex slope changes in particle size curve that were not existed at the closer distances spray of 15?cm or 25?cm, which implies that the near-field spray is more stable than far-field spray. This study is of important significance for further understanding the characteristics of solid-cone spray and guiding its application in dust reduction. 相似文献
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In order to understand the asphalt separation processes in a new technique of solvent deasphalting, the hydrodynamics of the jet-driven swirling flow within a spray granulation tower (SGT) was studied by using experimental and numerical methods. Mean velocity components were measured by use of the Phase Doppler Particle Anemometer (PDPA). Simulation with Reynolds Stress Model (RSM) was carried out to understand the flow information. Two different zones in the jet-driven swirling flow were observed in both experiment and simulation. A combined effect of jet, jet entrainment and jet interactions leads to complex flow behavior in the upper part. A double swirling flow was identified on the basis of the tangential and the axial velocity distribution in the lower part. The specific flow pattern was identified based on the experimental and computational flow field. An empirical formula was proposed to predict the percentage of the SGT occupied by the jet and the swirl zone. 相似文献
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10.
Jeekuen?LeeEmail author Shinjae?Kaug Byungjoon?Rho 《Journal of Mechanical Science and Technology》2003,17(5):766-775
The intermittent spray characteristics of a multi-hole diesel nozzle with a 2-spring nozzle holder were investigated experimentally.
Without changing the total orifice exit area, the hole number of the multi-hole nozzle varied from 3 (dn=0.42 mm) to 5 (dn=0.32mm). The time-resolved droplet diameters of the spray including the SMD (Sauter mean diameter) and the AMD (arithmetic
mean diameter), injected intermittently from the multi-hole nozzles into still ambient air, were measured by using a 2-D PDPA
(phase Doppler particle analyzer). The 5-hole nozzle spray shows the smaller spray cone angle, the decreased SMD distributions
and the small difference between the SMD and the AMD, compared with that of the 3-hole nozzle spray. From the SMD distributions
with the radial distance, the spray structure can be classified into the three regions : (a) the inner region showing the
high SMD distribution; (b) the mixing flow region where the shear flow structure would be constructed; and (c) the outer region
formed through the disintegration processes of the spray inner region and composed of fine droplets. Through the SMD distributions
along the spray centerline, it reveals that the SMD decreases rapidly after showing the maximum value in the vicinity of the
nozzle tip. The SMD remains the constant value near the Z/dn=166 and 156.3 for the 3-hole and 5-hole nozzles, which illustrate that the disintegration processes of the 5-hole nozzle
spray proceed more rapidly than that of the 3-hole nozzle spray. 相似文献