The Experts below are selected from a list of 14424 Experts worldwide ranked by ideXlab platform

Christian Coddet - One of the best experts on this subject based on the ideXlab platform.

  • optimal design of a cold Spray Nozzle by numerical analysis of particle velocity and experimental validation with 316l stainless steel powder
    Materials & Design, 2007
    Co-Authors: Wenya Li, Hanlin Liao, G Douchy, Christian Coddet
    Abstract:

    Abstract The optimization of exit diameter of a cold Spray Nozzle under different Spray conditions was investigated numerically for the first time. The optimal expansion ratio is influenced by the gas conditions, particle size, Nozzle divergent section length and throat diameter. The optimal expansion ratio increases with the increases in gas pressure and Nozzle divergent length. It decreases with the increases in gas temperature, particle size and Nozzle throat diameter. The optimal expansion ratio using He is less than that using N 2 under the same operating conditions. The experiment with a 316L stainless steel powder indicates that a dense 316L stainless steel coating with a high microhardness can be deposited with an optimized Nozzle using air as an accelerating gas owing to the high particle velocity. The good correlation of particle velocity with the coating microstructure and microhardness confirmed the optimal design method.

  • optimal design of a convergent barrel cold Spray Nozzle by numerical method
    Applied Surface Science, 2006
    Co-Authors: Wenya Li, Hanlin Liao, Hongtao Wang, Changjiu Li, G Zhang, Christian Coddet
    Abstract:

    Abstract A convergent-barrel (CB) cold Spray Nozzle was designed through numerical simulation. It was found that the main factors influencing significantly particle velocity and temperature include the length and diameter of the barrel section, the nature of the accelerating gas and its pressure and temperature, and the particle size. Particles can achieve a relatively low velocity but a high temperature under the same gas pressure using a CB Nozzle compared to a convergent–divergent (CD) Nozzle. The experiment results with Cu powder using the designed CB Nozzle confirmed that particle deposition can be realized under a lower gas pressure with a CB Nozzle.

Pravansu S Mohanty - One of the best experts on this subject based on the ideXlab platform.

  • design and optimization of rectangular cold Spray Nozzle radial injection angle expansion ratio and traverse speed
    Surface & Coatings Technology, 2017
    Co-Authors: Vikram Varadaraajan, Pravansu S Mohanty
    Abstract:

    Abstract A cold Spray Nozzle with radially injected powder was numerically modeled and experimentally validated. The gas flow field and particle trajectories were simulated for various injection angles and expansion ratios. Injection angle was seen to affect particle distribution and injection pressures. The effect of expansion ratio was numerically studied and experimentally verified with stainless steel powders. For this material system, highest deposition efficiency was observed at an overexpanded flow regime. High deposition rate was accompanied by strain rate induced phase change. In addition, the effect of traverse speed (between 1 and 6 mm/s) was assessed experimentally. While the speed did not affect bond strength and coating hardness, an optimum speed was found where there was a substantial increase in deposition rate.

I. W. Kirk - One of the best experts on this subject based on the ideXlab platform.

  • measurement and prediction of atomization parameters from fixed wing aircraft Spray Nozzles
    Transactions of the ASABE, 2007
    Co-Authors: I. W. Kirk
    Abstract:

    A survey of Spray Nozzles used by the agricultural aviation industry identified Nozzles and operating conditions that were most commonly used in applying agricultural chemicals in the U.S. Eleven hydraulic Nozzles and their typical range of operating conditions were selected from the survey. These eleven Nozzles were subjects of a research program to develop Spray atomization models that would be easy for aerial applicators to use in adjusting operations to control Spray drift from aerial agricultural Sprays. Each Nozzle was conducted through a series of trials in a Spray Nozzle test facility equipped with a laser spectrometer to develop a data set for atomization model development. Computer spreadsheet models were developed from the data set with operator selection of a specific Spray Nozzle and inputs of Nozzle orifice size, Spray discharge angle, Spray pressure, and aircraft airspeed. The model outputs included droplet size parameters, drift potential parameters, and droplet spectra classification. Aircraft speed was the dominating factor influencing atomization from most of the Spray Nozzle models. Validation studies showed that the models gave useful estimates of the computed parameters for estimating compliance with product label and state regulatory agency requirements for Spray drift mediation. The models are available on-line and in a user handbook as well as in the current technical presentation.

  • measurement and prediction of atomization parameters from fixed wing aircraft Spray Nozzles
    Transactions of the ASABE, 2007
    Co-Authors: I. W. Kirk
    Abstract:

    A survey of Spray Nozzles used by the agricultural aviation industry identified Nozzles and operating conditions that were most commonly used in applying agricultural chemicals in the U.S. Eleven hydraulic Nozzles and their typical range of operating conditions were selected from the survey. These eleven Nozzles were subjects of a research program to develop Spray atomization models that would be easy for aerial applicators to use in adjusting operations to control Spray drift from aerial agricultural Sprays. Each Nozzle was conducted through a series of trials in a Spray Nozzle test facility equipped with a laser spectrometer to develop a data set for atomization model development. Computer spreadsheet models were developed from the data set with operator selection of a specific Spray Nozzle and inputs of Nozzle orifice size, Spray discharge angle, Spray pressure, and aircraft airspeed. The model outputs included droplet size parameters, drift potential parameters, and droplet spectra classification. Aircraft speed was the dominating factor influencing atomization from most of the Spray Nozzle models. Validation studies showed that the models gave useful estimates of the computed parameters for estimating compliance with product label and state regulatory agency requirements for Spray drift mediation. The models are available on-line and in a user handbook as well as in the current technical presentation.

Jusuke Hidaka - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication of composite particles by liquid–liquid interfacial crystallization using an ultrasonic Spray Nozzle
    Powder Technology, 2014
    Co-Authors: Kazuki Gonda, Kazunori Kadota, Yuto Deki, Yuichi Tozuka, Atsuko Shimosaka, Yoshiyuki Shirakawa, Jusuke Hidaka
    Abstract:

    Abstract The purpose of this study was to produce composite particles, consisting of core starch particles coated with glycine, by liquid–liquid interfacial crystallization with an ultrasonic Spray Nozzle and to investigate the effect of operating conditions on glycine particle morphology. We confirmed that ultrasonic irradiation could improve the coating efficiency of the core starch particles during the crystallization process. We also investigated the transformation between different polymorphs of glycine crystals that covered the starch surface. The coating efficiency of the fine glycine crystals on the starch particles was improved by using an ultrasonic Spray Nozzle rather than anti-solvent crystallization without an ultrasonic Spray Nozzle. The glycine crystals on the surface of starch particles transformed from unstable to stable forms according to the solution-mediated mechanism and Ostwald rule of stages. The interaction between the core particles and guest particles was found to be a key factor in producing the composite particles. The results indicate that this crystallization process using the ultrasonic Spray Nozzle is promising for efficiently producing composite particles.

Wenya Li - One of the best experts on this subject based on the ideXlab platform.

  • optimal design of a cold Spray Nozzle by numerical analysis of particle velocity and experimental validation with 316l stainless steel powder
    Materials & Design, 2007
    Co-Authors: Wenya Li, Hanlin Liao, G Douchy, Christian Coddet
    Abstract:

    Abstract The optimization of exit diameter of a cold Spray Nozzle under different Spray conditions was investigated numerically for the first time. The optimal expansion ratio is influenced by the gas conditions, particle size, Nozzle divergent section length and throat diameter. The optimal expansion ratio increases with the increases in gas pressure and Nozzle divergent length. It decreases with the increases in gas temperature, particle size and Nozzle throat diameter. The optimal expansion ratio using He is less than that using N 2 under the same operating conditions. The experiment with a 316L stainless steel powder indicates that a dense 316L stainless steel coating with a high microhardness can be deposited with an optimized Nozzle using air as an accelerating gas owing to the high particle velocity. The good correlation of particle velocity with the coating microstructure and microhardness confirmed the optimal design method.

  • optimal design of a convergent barrel cold Spray Nozzle by numerical method
    Applied Surface Science, 2006
    Co-Authors: Wenya Li, Hanlin Liao, Hongtao Wang, Changjiu Li, G Zhang, Christian Coddet
    Abstract:

    Abstract A convergent-barrel (CB) cold Spray Nozzle was designed through numerical simulation. It was found that the main factors influencing significantly particle velocity and temperature include the length and diameter of the barrel section, the nature of the accelerating gas and its pressure and temperature, and the particle size. Particles can achieve a relatively low velocity but a high temperature under the same gas pressure using a CB Nozzle compared to a convergent–divergent (CD) Nozzle. The experiment results with Cu powder using the designed CB Nozzle confirmed that particle deposition can be realized under a lower gas pressure with a CB Nozzle.