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Title: Numerical study of high speed evaporating sprays

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
International Journal of Multiphase Flow
Additional Journal Information:
Journal Volume: 70; Journal Issue: C; Related Information: CHORUS Timestamp: 2016-09-14 19:45:02; Journal ID: ISSN 0301-9322
Country of Publication:
United Kingdom

Citation Formats

Irannejad, Abolfazl, and Jaberi, Farhad. Numerical study of high speed evaporating sprays. United Kingdom: N. p., 2015. Web. doi:10.1016/j.ijmultiphaseflow.2014.11.014.
Irannejad, Abolfazl, & Jaberi, Farhad. Numerical study of high speed evaporating sprays. United Kingdom. doi:10.1016/j.ijmultiphaseflow.2014.11.014.
Irannejad, Abolfazl, and Jaberi, Farhad. 2015. "Numerical study of high speed evaporating sprays". United Kingdom. doi:10.1016/j.ijmultiphaseflow.2014.11.014.
title = {Numerical study of high speed evaporating sprays},
author = {Irannejad, Abolfazl and Jaberi, Farhad},
abstractNote = {},
doi = {10.1016/j.ijmultiphaseflow.2014.11.014},
journal = {International Journal of Multiphase Flow},
number = C,
volume = 70,
place = {United Kingdom},
year = 2015,
month = 4

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.ijmultiphaseflow.2014.11.014

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Cited by: 5works
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Web of Science

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  • This report documents progress made during the second year of a three-year study of the atomization and evaporation characteristics of emulsified and alternative fuels at conditions typical of those found in gas turbine engines. The development of experimental techniques suitable for drop size measurements in realistic polydisperse fuel sprays in high pressure/temperature air has been the first goal of this year's program. The second area of interest has been the development of detailed drop models which predict the heat-up, evaporation, and trajectory of fuel sprays and the resulting size distribution parameters. In addition to these two areas, a facility wasmore » constructed during the first year of this program to allow for the containment of sprays in high pressure/temperature moving air with optical access for spray size measurements. These experimental and analytical tools have and will continue to be used to study the differences in atomization/evaporation of emulsified and neat fuels, and various other fuels at interest to the U.S. Navy.« less
  • Experimental and numerical results of the flow through orifices in rotating disks are presented, with emphasis on basic physical phenomena. It is shown that rotational effects strongly influence the massflow discharged, a phenomenon that cannot be modeled by a stationary setup. The study includes the determination of discharge coefficients under variation of the length-to-diameter ratio, pressure ratio, and rotational speed. The pressure ratio covers low as well as critical values, the maximum rotational speed is 10,000 rpm, which is equivalent to a tangential velocity of 110 m/s. In order to understand the flow structure, local flow velocities were measured bymore » means of a two-dimensional Laser-Doppler Velocimeter. Phase-resolved measurements have been carried out in front of and behind the orifices. A three-dimensional Finite-Volume Code with body-fitted coordinates in a rotating frame of reference is employed for the numerical analysis and the verification of its possibilities and limitations. The results reveal a very complex flow field, which is dominated by high velocity gradients in close vicinity to the orifices. The comparison of the computational solutions with the experimental data shows good agreement. Based on the measurements in combination with the numerical solution, a detailed insight into the physical properties of the flow is achieved.« less
  • The behavior of specimens dynamically loaded during the split Hopkinson (Kolsky) bar tests in a regime close to simple shear conditions was studied. The lateral surface of the specimens was investigated in a real-time mode with the aid of a high-speed infra-red camera CEDIP Silver 450M. The temperature field distribution obtained at different time made it possible to trace the evolution of plastic strain localization. The process of target perforation involving plug formation and ejection was examined using a high-speed infra-red camera and a VISAR velocity measurement system. The microstructure of tested specimens was analyzed using an optical interferometer-profilometer andmore » a scanning electron microscope. The development of plastic shear instability regions has been simulated numerically.« less
  • A new Eulerian model for turbulent evaporating sprays is presented. It comprises droplet heating and evaporation processes by solving separate transport equations for the droplet`s temperature and diameter. A Lagrangian approach, which the authors have discussed in detail on other occasions, is used in comparing the results of the new method. A comparison with experimental data shows that both approaches are successful in predicting the main features of turbulent evaporating sprays.
  • In the present study, a framework for modeling two-phase evaporating flow is presented, which employs an Eulerian-Lagrangian-Lagrangian approach. For the continuous phase, a joint velocity-composition probability density function (PDF) method is used. Opposed to other approaches, such PDF methods require no modeling for turbulent convection and chemical source terms. For the dispersed phase, the PDF of velocity, diameter, temperature, seen gas velocity and seen gas composition is calculated. This provides a unified formulation, which allows to consistently address the different modeling issues associated with such a system. Because of the high dimensionality, particle methods are employed to solve the PDFmore » transport equations. To further enhance computational efficiency, a local particle time-stepping algorithm is implemented and a particle time-averaging technique is employed to reduce statistical and bias errors. In comparison to previous studies, a significantly smaller number of droplet particles per grid cell can be employed for the computations, which rely on two-way coupling between the droplet and gas phases. The framework was validated using established experimental data and a good overall agreement can be observed.« less