The Experts below are selected from a list of 40926 Experts worldwide ranked by ideXlab platform
Francisco Javier Salvador - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of the effect of orifices Inclination Angle in multihole diesel injector nozzles part 1 hydraulic performance
Fuel, 2018Co-Authors: Francisco Javier Salvador, Joaquin De La Morena, Jose J. Lopez, M CrialesiespositoAbstract:Abstract Nozzle hydraulic performance has a significant impact on diesel spray development and combustion characteristics. Thus, it is important to understand the links between the nozzle geometry, the internal flow features and the spray formation. In this paper, a detailed analysis of the impact of the nozzle orifices Inclination Angle on its hydraulic performance is performed. For this purpose, three different nozzles with included Angles of 90, 140 and 155 degrees are evaluated. Instantaneous injection rate and momentum flux are measured on a set of injector operating conditions (mainly injection pressure and discharge pressure). The results show that higher Inclination Angles lead to smaller mass flow and momentum flux at steady-state conditions, due to the higher losses at the orifice inlet. These losses are translated in lower both area and velocity coefficients. Nevertheless, the impact of this parameter is limited thanks to the counter-acting effect of the hydrogrinding process, which produces larger rounding radii at the orifice inlet as the included Angle increases. Based on the experimental results, correlations of the discharge coefficient as a function of the Reynolds number are obtained and evaluated.
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experimental investigation of the effect of orifices Inclination Angle in multihole diesel injector nozzles part 2 spray characteristics
Fuel, 2018Co-Authors: Raul Payri, Francisco Javier Salvador, Joaquin De La Morena, V PaganoAbstract:Abstract Diesel spray development is a key research topic due to its impact on the combustion characteristics. On the current paper, the effect of the orifices Inclination Angle on the spray penetration characteristics is evaluated. For this purpose, three nozzles with included Angles of 90, 140 and 155° are selected. Visualization tests are performed on a room-temperature constant-pressure vessel pressurized with a high-density gas (SF 6 ), in order to reproduce the density conditions inside the combustion chamber at the start of the injection event. Both frontal and lateral Mie-scattering visualization are used, depending on the particular nozzle configuration. Results show how the spray penetration is slower as the Inclination Angle increases, which is linked to its lower nozzle outlet velocity. A statistical correlation of the spray penetration as a function of the area and velocity coefficients is obtained and discussed.
Rebecca Webb - One of the best experts on this subject based on the ideXlab platform.
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Changes in leaf Inclination Angle as an indicator of progression toward leaf surface storage during the rainfall interception process
Journal of Hydrology, 2020Co-Authors: Curtis D. Holder, Leal K. Lauderbaugh, Roser M. Ginebra-solanellas, Rebecca WebbAbstract:Abstract During rainfall events, rain and throughfall drops impact on individual leaves exerting a force that divides the drops into multiple droplets and produces momentary increases in the leaf Inclination Angle. A portion of the splash residue from the raindrop impact accumulates on the leaf surface and adds mass to the lamina of leaf. This lab-based study examined changes in leaf Inclination Angle after the impact of a sequence of raindrops of two different volumes (10 µl and 30 µl) on leaf surfaces of three different tree species (Acer saccharinum L., Ulmus pumila L., and Quercus gambelii Nutt.). Leaf Inclination is measured as the Angle between the lamina surface normal and the horizontal. The differences between the initial leaf Inclination Angle before raindrop impacts and the steady-state leaf Inclination Angles after each raindrop impact were examined to explore the hypothesis that rainsplash residue accumulated on leaves after raindrop impact will incrementally increase the steady-state leaf Inclination Angle as the leaves approach leaf surface storage. The difference between the initial leaf Inclination Angle and the steady-state leaf Inclination Angle after two 10 µl raindrops increased by 0.23° for Q. gambelii, 0.84° for A. saccharinum, and 1.29° for U. pumila. The difference between the initial leaf Inclination Angle and the steady-state leaf Inclination Angle after two 30 µl raindrops increased by 0.56° for Q. gambelii, 1.45° for U. pumila, and 2.05° for A. saccharinum. For each species, the mass of the accumulated water incrementally increased the steady-state leaf Inclination Angle after each raindrop impact. As expected, larger raindrops produced more rainsplash residue on the leaf surface based on the incremental increase in steady-state leaf Inclination Angle after sequential raindrop impacts. With repeated raindrop impacts, leaves in the canopy accumulate more water (mass) as the maximum leaf surface storage is achieved. Observing changes in steady-state leaf Inclination Angles after raindrop impact may serve as an indicator for rainfall interception totals during rainfall events.
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The influence of changes in leaf Inclination Angle and leaf traits during the rainfall interception process
Agricultural and Forest Meteorology, 2020Co-Authors: Roser M. Ginebra-solanellas, Curtis D. Holder, Leal K. Lauderbaugh, Rebecca WebbAbstract:Abstract Rainfall interception is a dynamic process where raindrops exert a force on leaf surfaces causing splashing and changes in leaf Inclination Angles. Leaf biomechanical properties determine the resistance to changes in leaf Inclination Angle due to raindrop impacts. The hydrophobicity of leaf surfaces may influence water movement off the leaf. A laboratory experiment incorporating a raindrop generator and high-speed video camera was used to examine the relationships between raindrop impact, leaf biomechanics, and water droplet retention of three tree species (Acer saccharinum, Ulmus pumila, and Quercus gambelii). Specifically, we explored if the impact of a falling raindrop resulted in the maximum leaf Inclination Angle exceeding the water droplet retention Angle, allowing for the leaf to shed the intercepted raindrop. This study found that changes in leaf Inclination Angle after a single raindrop impact could explain water movement off more than 6.7% of the leaf surfaces associated with the three tree species. The change in leaf Inclination Angle over time produced a decaying sinusoidal curve after raindrop impact. The amplitude of the change in leaf Inclination Angle was greater with larger drops; however, this change varied with species. Quercus gambelii was least affected by drop impact compared with Acer saccharinum and Ulmus pumila. For species with stiff leaves, such as Quercus gambelii, the resistance of movement after raindrop impact could be a factor in inhibiting the amount of precipitation shed from the canopy. The influence of raindrop impact during rainfall events and leaf biomechanical properties may inform and enhance modeling of the dynamic process of rainfall interception.
V Pagano - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of the effect of orifices Inclination Angle in multihole diesel injector nozzles part 2 spray characteristics
Fuel, 2018Co-Authors: Raul Payri, Francisco Javier Salvador, Joaquin De La Morena, V PaganoAbstract:Abstract Diesel spray development is a key research topic due to its impact on the combustion characteristics. On the current paper, the effect of the orifices Inclination Angle on the spray penetration characteristics is evaluated. For this purpose, three nozzles with included Angles of 90, 140 and 155° are selected. Visualization tests are performed on a room-temperature constant-pressure vessel pressurized with a high-density gas (SF 6 ), in order to reproduce the density conditions inside the combustion chamber at the start of the injection event. Both frontal and lateral Mie-scattering visualization are used, depending on the particular nozzle configuration. Results show how the spray penetration is slower as the Inclination Angle increases, which is linked to its lower nozzle outlet velocity. A statistical correlation of the spray penetration as a function of the area and velocity coefficients is obtained and discussed.
M Crialesiesposito - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of the effect of orifices Inclination Angle in multihole diesel injector nozzles part 1 hydraulic performance
Fuel, 2018Co-Authors: Francisco Javier Salvador, Joaquin De La Morena, Jose J. Lopez, M CrialesiespositoAbstract:Abstract Nozzle hydraulic performance has a significant impact on diesel spray development and combustion characteristics. Thus, it is important to understand the links between the nozzle geometry, the internal flow features and the spray formation. In this paper, a detailed analysis of the impact of the nozzle orifices Inclination Angle on its hydraulic performance is performed. For this purpose, three different nozzles with included Angles of 90, 140 and 155 degrees are evaluated. Instantaneous injection rate and momentum flux are measured on a set of injector operating conditions (mainly injection pressure and discharge pressure). The results show that higher Inclination Angles lead to smaller mass flow and momentum flux at steady-state conditions, due to the higher losses at the orifice inlet. These losses are translated in lower both area and velocity coefficients. Nevertheless, the impact of this parameter is limited thanks to the counter-acting effect of the hydrogrinding process, which produces larger rounding radii at the orifice inlet as the included Angle increases. Based on the experimental results, correlations of the discharge coefficient as a function of the Reynolds number are obtained and evaluated.
Joaquin De La Morena - One of the best experts on this subject based on the ideXlab platform.
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experimental investigation of the effect of orifices Inclination Angle in multihole diesel injector nozzles part 1 hydraulic performance
Fuel, 2018Co-Authors: Francisco Javier Salvador, Joaquin De La Morena, Jose J. Lopez, M CrialesiespositoAbstract:Abstract Nozzle hydraulic performance has a significant impact on diesel spray development and combustion characteristics. Thus, it is important to understand the links between the nozzle geometry, the internal flow features and the spray formation. In this paper, a detailed analysis of the impact of the nozzle orifices Inclination Angle on its hydraulic performance is performed. For this purpose, three different nozzles with included Angles of 90, 140 and 155 degrees are evaluated. Instantaneous injection rate and momentum flux are measured on a set of injector operating conditions (mainly injection pressure and discharge pressure). The results show that higher Inclination Angles lead to smaller mass flow and momentum flux at steady-state conditions, due to the higher losses at the orifice inlet. These losses are translated in lower both area and velocity coefficients. Nevertheless, the impact of this parameter is limited thanks to the counter-acting effect of the hydrogrinding process, which produces larger rounding radii at the orifice inlet as the included Angle increases. Based on the experimental results, correlations of the discharge coefficient as a function of the Reynolds number are obtained and evaluated.
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experimental investigation of the effect of orifices Inclination Angle in multihole diesel injector nozzles part 2 spray characteristics
Fuel, 2018Co-Authors: Raul Payri, Francisco Javier Salvador, Joaquin De La Morena, V PaganoAbstract:Abstract Diesel spray development is a key research topic due to its impact on the combustion characteristics. On the current paper, the effect of the orifices Inclination Angle on the spray penetration characteristics is evaluated. For this purpose, three nozzles with included Angles of 90, 140 and 155° are selected. Visualization tests are performed on a room-temperature constant-pressure vessel pressurized with a high-density gas (SF 6 ), in order to reproduce the density conditions inside the combustion chamber at the start of the injection event. Both frontal and lateral Mie-scattering visualization are used, depending on the particular nozzle configuration. Results show how the spray penetration is slower as the Inclination Angle increases, which is linked to its lower nozzle outlet velocity. A statistical correlation of the spray penetration as a function of the area and velocity coefficients is obtained and discussed.
