Relevant bibliographies by topics / Nozzle length

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Nozzle length'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "Nozzle length"

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Hamaidia, Walid, Toufik Zebbiche, Mohamed Sellam, and Abderrazak Allali. "Performance improvement of supersonic nozzles design using a high-temperature model." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 13 (February 27, 2019): 4895–910. http://dx.doi.org/10.1177/0954410019831862.

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The aim of this paper is to discuss the development of new contours of axisymmetric supersonic nozzles giving a uniform and parallel flow at the exit section, to improve the aerodynamic performances compared to the minimum length nozzle, by increasing the exit Mach number and the thrust coefficient, and by reduction of the nozzle's mass, while holding the same throat section between the two nozzles. The new nozzle is named the best performance nozzle. Its form contains a cylindrical central body and an external wall for the flow redress. The study is done at high temperature, lower than the dissociation threshold of the molecules. The variation of the specific heats with the temperature is considered. The design is made by the method of characteristics. The predictor-corrector algorithm is used to make the numerical resolution of the obtained nonlinear algebraic equations. The validation of results is made by the convergence of the numerical critical sections ratio with that given by the theory. The comparison of the results is made with the minimum length nozzle since it is currently used in the aerospace propulsion. The design depends on M E, T0, y body, y*, and the mesh generation. The application is done with air. A computational fluid dynamics verification for the under nozzle expressed regime has shown that a flow separation with the wall is observed because of the side-loads, which are reduced for this new nozzle compared to the minimum length nozzle.
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Morgan, Michael N., and V. Baines-Jones. "On the Coherent Length of Fluid Nozzles in Grinding." Key Engineering Materials 404 (January 2009): 61–67. http://dx.doi.org/10.4028/www.scientific.net/kem.404.61.

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The delivery of grinding fluid to the contact zone is generally achieved via a nozzle. The nozzle geometry influences the fluid velocity and flow pattern on exit from the nozzle orifice. It is important to the efficiency of the process and to the performance of the operation that the fluid is delivered in a manner that ensures the desired jet velocity has adequate coverage of the contact zone. Often, assumptions about adequate coverage are based on visual inspections of the jet coherence. This paper provides new insight into the internal nozzle flows and the coherent length of a wide range of nozzle designs. The work presents a new analytical model to predict coherent length which is shown to correlate well with measured data from experiment. Recommendations are given to guide a user to optimal design of nozzles to ensure adequate fluid supply to the contact zone.
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Fu, Lei, Shuai Zhang, and Yao Zheng. "Performances analysis of asymmetric minimum length nozzles." International Journal of Modeling, Simulation, and Scientific Computing 07, no. 02 (June 2016): 1650021. http://dx.doi.org/10.1142/s1793962316500215.

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Two-dimensional (2D) and axisymmetric minimum length nozzles (MLNs) with constant and variable specific heat were strictly designed using the method of characteristics (MOCs). MOC is a numerical technique which has great advantages in accuracy and efficiency for solving hyperbolic partial differential equations. According to previous MLN designs, violent vibrations of upper wall discrete points at the inlet were observed for 2D nozzles. Meanwhile, slight compressions could be observed in the flow field of axisymmetric nozzles designed by those methods. We proposed a novel technique in which the inlet grid is intensified to overcome the limitations mentioned above. Inviscid numerical simulations by CFD revealed that the proposed nozzle could meet the requirements for exit Mach number and flow field uniformity. Additionally, asymmetric MLNs could be used to hypersonic vehicles. The preliminary performances of 2D asymmetric nozzle with constant specific heat were investigated.
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V. Paul, Roy, Kriparaj K.G., and Tide P.S. "Numerical predictions of the flow characteristics of subsonic jet emanating from corrugated lobed nozzle." Aircraft Engineering and Aerospace Technology 92, no. 7 (May 4, 2020): 955–72. http://dx.doi.org/10.1108/aeat-03-2019-0041.

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Purpose The purpose of this study is to investigate the aerodynamic characteristics of subsonic jet emanating from corrugated lobed nozzle. Design/methodology/approach Numerical simulations of subsonic turbulent jets from corrugated lobed nozzles using shear stress transport k-ω turbulence model have been carried out. The analysis was carried out by varying parameters such as lobe length, lobe penetration and lobe count at a Mach number of 0.75. The numerical predictions of axial and radial variation of the mean axial velocity, u′u′ ¯ and v′v′ ¯ have been compared with experimental results of conventional round and chevron nozzles reported in the literature. Findings The centreline velocity at the exit of the corrugated lobed nozzle was found to be lower than the velocity at the outer edges of the nozzle. The predicted potential core length is lesser than the experimental results of the conventional round nozzle and hence the decay in centreline velocity is faster. The centreline velocity increases with the increase in lobe length and becomes more uniform at the exit. The potential core length increases with the increase in lobe count and decreases with the increase in lobe penetration. The turbulent kinetic energy region is narrower with early appearance of a stronger peak for higher lobe penetration. The centreline velocity degrades much faster in the corrugated nozzle than the chevron nozzle and the peak value of Reynolds stress appears in the vicinity of the nozzle exit. Practical implications The corrugated lobed nozzles are used for enhancing mixing without the thrust penalty inducing better acoustic benefits. Originality/value The prominent features of the corrugated lobed nozzle were obtained from the extensive study of variation of flow characteristics for different lobe parameters after making comparison with round and chevron nozzle, which paved the way to the utilization of these nozzles for various applications.
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Luo, Cai Xia, and Xiao Xia Guo. "Stress of Spherical Shell with Opening Nozzle." Advanced Materials Research 452-453 (January 2012): 274–77. http://dx.doi.org/10.4028/www.scientific.net/amr.452-453.274.

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To study the stress condition at the junction of the spherical shell with opening nozzle, using the finite element analysis, a finite element model is built in view of the same spherical shell joining a flatting nozzle and inside-stretching nozzles with different inner lengths differently. The maximum stress and stress distribution are got. All kinds of stresses are obtained by the total stress which is carried on linear processing. The result shows the inside-stretching nozzle can reduce the maximum stress in comparison with the flatting nozzle, mainly reducing the local membrane stress, but not the peak stress. The maximum stress falls with increasing the inner length of the nozzle to some extent, and beyond the extent, the maximum stress tends to reach a stable value basically without changing the inner length. The stress variation can effectively provide a reference for improving the strength of the spherical shell.
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Wang, Xin Hua, Zhi Jie Li, Shu Wen Sun, and Gang Zheng. "Research on the Influence Factors of Cavitating Jet in Jet Pipe Amplifier Nozzle." Applied Mechanics and Materials 229-231 (November 2012): 617–20. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.617.

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The cavitation flow characteristics in jet pipe amplifier with different nozzles were simulated using commercial computational fluid dynamics (CFD) software. The influence of operating parameters and structural parameters of jet nozzles on cavitation jets are the key objective. These parameters mainly include inlet pressure, outlet pressure, temperature of water, nozzle convergence angle, the length of the nozzle cylindrical section, nozzle diameter and nozzle export chamfer angle. The results provide methods to limit the emergence and development of the nozzle jet internal cavitations.
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Wang, Zhi Feng, Xin Du Chen, Shen Neng Huang, Fei Yu Fang, and Han Wang. "Research on Deposition Characteristics of the Double-Nozzle in Near-Field Electrospinning." Key Engineering Materials 679 (February 2016): 59–62. http://dx.doi.org/10.4028/www.scientific.net/kem.679.59.

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With the double-nozzle NFES process, the uncertainty is more suitable to investigate than the multi-nozzle NFES and also meet higher liquid throughput requirement than conventional electrospinning. Moreover, the key point is to control the deposition characteristics of double-nozzle NFES under the interaction of the nozzles. This paper simulates the change in electric field intensity with the change of nozzle length and voltage. The experiment shows that the deposition distance becomes smaller when needle length increases, however, the influence of voltage is opposite in certain range. According to the study above, the results could be the guidance of the multi-nozzles NEFS in manufacturing process, and also can illustrate the force distribution of the jet with further modification.
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A.K., Mubarak, and Tide P.S. "Design of a double parabolic supersonic nozzle and performance evaluation by experimental and numerical methods." Aircraft Engineering and Aerospace Technology 91, no. 1 (January 7, 2018): 145–56. http://dx.doi.org/10.1108/aeat-12-2017-0275.

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Purpose The purpose of this paper is to design a double parabolic nozzle and to compare the performance with conventional nozzle designs. Design/methodology/approach The throat diameter and divergent length for Conical, Bell and Double Parabolic nozzles were kept same for the sake of comparison. The double parabolic nozzle has been designed in such a way that the maximum slope of the divergent curve is taken as one-third of the Prandtl Meyer (PM) angle. The studies were carried out at Nozzle Pressure Ratio (NPR) of 5 and also at design conditions (NPR = 3.7). Experimental measurements were carried out for all the three nozzle configurations and the performance parameters compared. Numerical simulations were also carried out in a two-dimensional computational domain incorporating density-based solver with RANS equations and SST k-ω turbulence model. Findings The numerical predictions were found to be in reasonable agreement with the measured experimental values. An enhancement in thrust was observed for double parabolic nozzle when compared with that of conical and bell nozzles. Research limitations/implications Even though the present numerical simulations were capable of predicting shock cell parameters reasonably well, shock oscillations were not captured. Practical implications The double parabolic nozzle design has enormous practical importance as a small increase in thrust can result in a significant gain in pay load. Social implications The thrust developed by the double parabolic nozzle is seen to be on the higher side than that of conventional nozzles with better fuel economy. Originality/value The overall performance of the double parabolic nozzle is better than conical and bell nozzles for the same throat diameter and length.
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Kocijel, Lino, Vedran Mrzljak, Maida Čohodar Husić, and Ahmet Čekić. "Numerical Analysis of Fuel Injector Nozzle Geometry - Influence on Liquid Fuel Contraction Coefficient and Reynolds Number." Journal of Maritime & Transportation Science 57, no. 1 (December 2019): 23–45. http://dx.doi.org/10.18048/2019.57.02.

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This paper investigates the influence of the fuel injector nozzle geometry on the liquid fuel contraction coefficient and Reynolds number. The main three fuel injector nozzle geometry parameters: nozzle diameter (d), nozzle length (l) and nozzle inlet radius (r) have a strong influence on the liquid fuel contraction coefficient and Reynolds number. The variation of the nozzle geometry variables at different liquid fuel pressures, temperatures and injection rates was analyzed. The liquid fuel contraction coefficient and Reynolds number increase with an increase in the nozzle diameter, regardless of the fuel injection rate. An increase in the r/d ratio causes an increase in the fuel contraction coefficient, but the increase is not significant after r/d = 0.1. A nozzle length increase causes a decrease in the fuel contraction coefficient. Increase in the nozzle length of 0.5 mm causes an approximately similar decrease in the contraction coefficient at any fuel pressure and any nozzle length. Fuel injectors should operate with minimal possible nozzle lengths in order to obtain higher fuel contraction coefficients.
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Kordík, Jozef, and Zdeněk Trávníček. "Novel Nozzle Shapes for Synthetic Jet Actuators Intended to Enhance Jet Momentum Flux." Actuators 7, no. 3 (August 28, 2018): 53. http://dx.doi.org/10.3390/act7030053.

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An axisymmetric synthetic jet actuator based on a loudspeaker and five types of flanged nozzles were experimentally tested and compared. The first (reference) type of nozzle was a common sharp-edged circular hole. The second type had a rounded lip on the inside. The third nozzle type was assembled from these two types of nozzles—it had a rounded lip on the inside and straight section on the outside. The fourth nozzle was assembled using orifice plates such that the rounded lips were at both inner and outer nozzle ends. The last nozzle was equipped with an auxiliary nozzle plate placed at a small distance downstream of the main nozzle. The actuators with particular nozzles were tested by direct measurement of the synthetic jet (SJ) time-mean thrust using precision scales. Velocity profiles at the actuator nozzle exit were measured by a hot-wire anemometer. Experiments were performed at eight power levels and at the actuator resonance frequency. The highest momentum flux was achieved by the nozzle equipped with an auxiliary nozzle plate. Namely, an enhancement was approximately 31% in comparison with an effect of the reference nozzle at the same input power. Furthermore, based on the cavity pressure and the experimental velocity profiles, parameters for a lumped element model (mass of moving fluid and pressure loss coefficient) were evaluated. These values were studied as functions of the dimensionless stroke length.
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Dissertations / Theses on the topic "Nozzle length"

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Taylor, Neil Vernon. "An integrated approach to expansion deflection nozzle analysis." Thesis, University of Bristol, 2002. http://hdl.handle.net/1983/f70eca23-8d5d-4ed0-8106-279b8f189747.

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Expansion Deflection (ED) nozzles have long been considered as an alternative to conventional bell and conical designs. The ED nozzle has two primary benefits over such nozzle configurations, being shorter, and with the potential for altitude compensation. However, the difficulties involved with modelling the complex flow interactions within the nozzle type have thus far prevented the creation of a reliable method for its design and analysis. The work presented within this dissertation makes use of a combination of several different approaches to flow solution to provide a more complete analysis than previously achieved. The primary advance is the use of a CFD scheme to analyse the transonic throat region, the results of which are used as input to a Method of Characteristics based algorithm for the solution of the inviscid supersonic flow-field. This method is both efficient, and allows contour optimisation through the calculus of variations. The viscous flow region is treated in a partially or fully empirical manner, depending upon ambient pressure. The results of this analysis reveal several previously unidentified flow-field behaviours and design parameter interactions. Careful selection of the variables used to define the throat region is shown to be of considerable importance, as they effect not just the thrust produced, but also whether a real flow through such a nozzle may' exist. Secondly, the high probability of shock wave formation and interaction with the nozzle wall within length optimised ED nozzles is demonstrated. This has consequences for both the design and analysis of the ED nozzle. Overall, a framework is established which allows the flow behaviour and performance characteristics of the nozzle type to be estimated in greater detail than previously possible. The performance increments demonstrated over conventional bell nozzles include an approximately 25 to 50 percent length reduction for nozzles designed for solely high altitude operation, and a similar reduction in length plus a noticeable increase in low altitude thrust for trans-atmospheric nozzles. However, before application of the ED nozzle concept to a real system becomes possible, several areas of uncertainty must be addressed, and these are highlighted at the end of this dissertation.
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Mead, Ryan M. "Analysis of Flow in a Spray Nozzle With Emphasis on Exiting Jet Free Surface." [Tampa, Fla.] : University of South Florida, 2003. http://purl.fcla.edu/fcla/etd/SFE0000138.

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Viera, Sotillo Juan Pablo. "Experimental study of the effect of nozzle geometry on the performance of direct-injection diesel sprays for three different fuels." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/81857.

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This thesis studies the influence of internal nozzle flow characteristics over a large spectrum of experimental conditions and diagnostics. Experiments were carried out for two nozzle geometries---cylindrical and conical single hole nozzles---and three different fuels. Two of the fuels are pure components---n-heptane and n-dodecane---while the third fuel consists of a three-component surrogate to better represent the physical and chemical properties of diesel fuel. Measurements include a complete hydraulic characterization consisting of instantaneous injection rate and spray momentum flux measurements; a high-speed visualization of isothermal liquid spray; a high-speed visualization of the evaporative inert spray, imaging liquid and vapor phases simultaneously and finally, a high-speed visualization of the high temperature reactive spray, imaging vapor phase and OH* chemiluminescence for each injection event. All high-temperature diagnostics were performed in a continuous flow test chamber that allows an accurate control on a wide range of thermodynamic conditions (up to 1000 K and 15 MPa). The experimental findings from this work, and the large database obtained (available for download at: http://www.cmt.upv.es/DD01.aspx), could be used to validate CFD models that could help the community understand the fundamental driving mechanisms behind these observations.
En esta tesis se estudia la influencia del flujo interno sobre un amplio espectro de condiciones y diagnósticos experimentales. Se realizaron experimentos para dos geometrías de tobera---toberas cilíndrica y cónica de un único orificio---y tres combustibles. Dos de los combustibles son puros---n-heptano y n-dodecano--- mientras el tercero es un combustible sustituto que consiste en una mezcla de tres componentes que busca representar mejor las propiedades físicas y químicas del diesel. Las medidas incluyen una caracterización hidráulica completa, compuesta por tasa de inyección y cantidad de movimiento instantáneas; una visualización de alta velocidad del chorro líquido isotermo; una visualización de alta velocidad del chorro inerte evaporativo, con captura simultánea de las fases líquida y vapor y, finalmente, una visualización del chorro reactivo a alta temperatura, con captura de la fase vapor y la quimioluminiscencia del radical OH* para cada evento de inyección. Todos los diagnósticos en condiciones de alta temperatura fueron realizados en una maqueta de alta presión y temperatura de flujo constante que permite controlar con precisión un rango amplio de condiciones termodinámicas (hasta 1000 K y 15 MPa). Los resultados experimentales y la gran base de datos obtenida en este trabajo (disponible en: http://www.cmt.upv.es/DD01.aspx), podrían ser utilizados para validar modelos CFD detallados que podrían ayudar a la comunidad científica a entender mejor los mecanismos fundamentales que producen los resultados observados.
Aquesta tesi estudia la influència del flux intern sobre un gran espectre de condicions i diagnòstics experimentals. Es van realitzar experiments per a dos geometries de tovera---toveres ci¿líndrica i cónica amb un únic orifici---i tres combustibles. Dos dels combustibles són purs---n-heptà i n-dodecà--- mentre el tercer combustible consisteix en una mescla de tres components que formen un combustible substitut que busca representar millor les propietats físiques i químiques del dièsel. Les mesures inclouen una caracterització hidràulica completa, composta per taxa d'injecció i quantitat de moviment instantanis; visualització d'alta velocitat del doll líquid isoterme; visualització d'alta velocitat del doll inert evaporatiu, capturant simultàniament les fases líquid i vapor i, finalment, una visualització del doll reactiu a alta temperatura, capturant la fase vapor i la quimioluminiscència del radical OH per a cada esdeveniment d'injecció. Tots els diagnòstics en condicions d'alta temperatura van ser realitzats en una insta¿lació d'alta pressió i temperatura amb flux constant que permet controlar amb precisió un ampli rang de condicions termodinàmiques (fins a 1000 K i 15 MPa). Els resultats experimentals i la gran base de dades obtinguda en aquest treball (disponible a la web en: http://www.cmt.upv.es/dd01.aspx), podrien ser utilitzats per tal de validar models CFD detallats que podrien ajudar a la comunitat científica a entendre millor els mecanismes fonamentals que produeixen aquestes observacions.
Viera Sotillo, JP. (2017). Experimental study of the effect of nozzle geometry on the performance of direct-injection diesel sprays for three different fuels [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/81857
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Hong, Chin Tung. "Analysis of flow in a 3D chamber and a 2D spray nozzle to approximate the exiting jet free surface." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000560.

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Enico, Daniel. "External Heat Transfer Coefficient Predictions on a Transonic Turbine Nozzle Guide Vane Using Computational Fluid Dynamics." Thesis, Linköpings universitet, Mekanisk värmeteori och strömningslära, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-178173.

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The high turbine inlet temperature of modern gas turbines poses a challenge to the material used in the turbine blading of the primary stages. Mechanical failure mechanisms are more pronounced at these high temperatures, setting the lifetime of the blade. It is therefore crucial to obtain accurate local metal temperature predictions of the turbine blade. Accurately predicting the external heat transfer coefficient (HTC) distribution of the blade is therefore of uttermost importance. At present time, Siemens Energy uses the boundary layer code TEXSTAN for this purpose. The limitations coupled to such codes however make them less applicable for the complex flow physics involved in the hot gas path of turbine blading. The thesis therefore aims at introducing CFD for calculating the external HTC. This includes conducting an extensive literature study to find and validate a suitable methodology. The literature study was centered around RANS modeling, reviewing how the calculation of the HTC has evolved and the performance of some common turbulence and transition models. From the literature study, the SST k − ω model in conjunction with the γ − Reθ transition model, the v2 − f model and the Lag EB k − ε model were chosen for the investigation of a suitable methodology. The validation of the methodology was based on the extensively studied LS89 vane linear cascade of the von Karman Institute. In total 13 test cases of the cascade were chosen to represent a wide range of flow conditions. Both a periodic model and a model of the entire LS89 cascade were tested but there were great uncertainties whether or not the correct flow conditions were achieved with the model of the entire cascade. It was therefore abandoned and a periodic model was used instead. The decay of turbulence intensity is not known in the LS89 cascade. This made the case difficult to model since the turbulence boundary conditions then were incomplete. Two approaches were attempted to handle this deficiency, where one was ultimately found invalid. It was recognized that the Steelant-Dick postulation could be used in order to find a turbulent length scale which when specified at the inlet, lead to fairly good agreement with data of the HTC. The validation showed that the SST γ − Reθ model performs relatively well on the suction side and in transition onset predictions but worse on the pressure side for certain flow conditions. The v2 − f model performed better on the pressure side and on a small portion of the suction side. Literature emphasized the importance of obtaining proper turbulence characteristics around the vane for accurate HTC-predictions. It was found that the results of the validation step could be closely coupled to this statement and that further work is needed regarding this. Further research must also be done on the Steelant-Dick postulation to validate it as a reliable method in prescribing the inlet length scale.
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Asar, Munevver Elif. "Investigating Turbine Vane Trailing Edge Pin Fin Cooling in Subsonic and Transonic Cascades." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu155551385206548.

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Solomon, Brad K. "Methods for Identifying Acoustic Emissions From the Front Face of a Small Piezoelectric Blower." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3542.

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This thesis focuses on identifying acoustic noise generating components in piezoelectric blowers through transverse velocity measurements and the development of a numerical fluid model. Piezoelectric ceramics have proven useful for many industries and areas of research involving: high precision actuators, noise control, ultrasonic devices, and many other areas. As of late, a unique adaptation of piezoelectric ceramics is surfacing in the area of pumping and cooling. Air pumps that use these ceramics replace the traditional electric motor, resulting in lower power consumption, less moving parts, constant pressure gradients, lower overall weight, and a low profile. The current drawback of this application is the acoustic radiation produced by the blowers. Since these blowers are new to market, little research or development has been done to characterize the noise emissions. This thesis studies the acoustic emissions from the front face of a Murata piezoelectric blower. Jet noise and structural vibrations are two acoustic sources of interest that are studied in this research. A Direct Numerical Simulation (DNS) of the fluid flow through a Murata blower is developed to better identify noise generating mechanisms. The model solutions predict trends in sound pressure levels (SPL) of the jet noise and volumetric flow rates. Both the SPL and flow rate are shown to be functions of critical geometrical dimensions within the flow path of a Murata blower. Important dimensional components are identified as well as non-influential ones. Design guidelines are given to reduce noise emission from the front side of a blower and increase the volumetric flow rate. The results of this research have a direct impact on the piezoelectric blower industry and future blower designs.
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"Performance comparison between a full-length and a truncated aerospike nozzle." CALIFORNIA STATE UNIVERSITY, LONG BEACH, 2010. http://pqdtopen.proquest.com/#viewpdf?dispub=1472342.

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王俊生. "Effect of Nozzle Length on Pumping Performance for a Gas-driven Mircopump." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/18099174383074101887.

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Wu, Yu-Ning, and 吳祐甯. "Optimal Design Combination of Suction Inlet Location and Nozzle Length of a Gas-driven Micropump." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/12727849185065327369.

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碩士
國立臺灣海洋大學
機械與機電工程學系
97
In comparison to other micropumps with different driving methods, a negative-pressure micropump can drive arbitrary fluids and it has simpler structure. Therefore, a fixed-shape gas-driven micropump of negative- pressure type was used in the present study. The study utilized a CFD code of FLUENT and as the analysis tool to analyze the internal flow fields inside the micropump in which the nozzle length is varied with various openings of suction inlets. In order to obtain the optimal design for pumping flow rates of the micropump, the effects on micropump performance were analyzed by the various combinations of nozzle length and suction inlets. Major conclusions of the analyses for designing the gas-driven micropump were obtained in the present study. First of all, among the cases of single-opening and multi-opening vertical to the nozzle, the optimal suction flow rates could be obtained when the nozzle outlet location should correspond to the suction inlet opening. For the parallel single-opening cases, there was fewer shear force could disturb the flow due to the same directions of the suction inlet flow and the driving flow. As a result, the parallel cases were the optimal design of suction inlet opening in the present study. For the multi-opening cases, both suction inlet openings in the front of the pump and near the converging section could provide a better micropump flow rate. The reason for that is the suction flow rate is enhanced due to entrainment effects at the opening near the converging section of the micropump. For all of the single-opening and multi-opening cases in the study, the pumping capacity of the micropump significantly deteriorated when the nozzle length extended to the converging section of the micropump.
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Books on the topic "Nozzle length"

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2954-, Mengle Vinod Govind, and Lewis Research Center, eds. Noise reduction with lobed mixers: Nozzle-length and free-jet speed effects. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1997.

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Book chapters on the topic "Nozzle length"

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Belbaki, Abderrahmane, and Yamina Mebdoua-Lahmar. "Influence of Diverging Section Length on the Supersonic Jet Delivered from Micro-nozzle: Application to Cold Spray Coating Process." In Lecture Notes in Mechanical Engineering, 465–73. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41468-3_39.

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Sakaki, Kazuhiko, Shuhei Shinkai, Nobuhara Ebara, and Yasuo Shimizu. "Effect of Gun Nozzle Geometry, Increase in the Entrance Convergent Section Length and Powder Injection Position on Cold Sprayed Titanium Coatings." In Progress in Powder Metallurgy, 413–16. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-419-7.413.

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Sahu, Sameer Ranjan, and Dipti Prasad Mishra. "CFD-Supported Designing of a Louvered Cylindrical Mixing Pipe for Maximum Air Entrainment." In Design and Optimization of Mechanical Engineering Products, 105–31. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-3401-3.ch006.

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Conservation equations of mass, momentum and energy have been solved numerically along with a two-equation-based k-ɛ turbulent model to determine the air entrainment into a mixing pipe. Two different louvered pipe configurations (one with entrance face closed to atmosphere while the other was opened) were used to entrain air into the mixing pipe and by changing various design parameters, the resulting effects were studied. For both the configurations, the opening area and the number of nozzles (assumed exhaust pipe) had significant effect in bringing down the exhaust temperature especially the configuration with its entrance face opened to atmosphere. Temperature as low as 309 K (approx.) was successfully achieved in the analysis. Nozzle protrusion length also proved to be an important parameter among other parameters like nozzle pitch circle diameter, inclination angle and pipe diameter.
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"Minimum-Length Nozzles." In Gasdynamics, 307–28. New York: American Institute of Aeronautics and Astronautics, 1986. http://dx.doi.org/10.2514/5.9781600861871.0307.0328.

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Nouri, J. M., S. Mackenzie, C. Gaskell, and A. Dhunput. "Effect of viscosity, temperature and nozzle length-to-diameter ratio on internal flow and cavitation in a multi-hole injector." In Fuel Systems for IC Engines, 265–78. Elsevier, 2012. http://dx.doi.org/10.1533/9780857096043.7.265.

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Conference papers on the topic "Nozzle length"

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Pearl, Jason M., William F. Louisos, and Darren L. Hitt. "Viscous Effects on Performance of Linear Plug Micronozzles." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37612.

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A parametric, two-dimensional, computational study examining steady-state plug micronozzle performance has been conducted. As part of the study, a new method for plug contour construction is proposed. The performance of several different nozzle geometries is compared to that of a traditional plug nozzle geometry designed using the Method of Characteristics (MOC). New nozzle designs are derived from the MOC based design and geometric transformations are used to produce plug nozzles of reduced length. Spike lengths corresponding to 60, 50, 40, and 27% of the MOC nozzle’s length are examined. The throat Reynolds number is varied from 80–820. Thrust is used a metric to assess nozzle performance. The geometry which maximizes performance is found to vary with Reynolds number. It is observed that reducing the plug length improves thrust production for the range of Reynolds number examined.
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Zebbiche, Toufik. "Supersonic Axisymmetric Minimum Length Nozzle Conception at High Temperature." In 40th Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-4110.

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Renault, T., and N. Hussary. "Effects of Nozzle Diameter, Nozzle Length, Standoff Distance and Secondary Flow on Plasma Cutting Speed." In IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science. IEEE, 2005. http://dx.doi.org/10.1109/plasma.2005.359523.

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Rao, G., and J. Beck. "Use of discontinuous exit flows to reduce rocket nozzle length." In 30th Joint Propulsion Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1994. http://dx.doi.org/10.2514/6.1994-3264.

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Nishihara, Munetake, Tomoyuki Murakami, Yoshihiro Okuno, and Hiroyuki Yamasaki. "Effects of Nozzle Length on the Performance of Disk MHD Generator." In 33rd Plasmadynamics and Lasers Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-2116.

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Ladeinde, Temitayo, and Hsun Chen. "Performance Comparison of a Full-Length and a Truncated Aerospike Nozzle." In 46th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-6593.

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Clarke, Edward, and Robert Frith. "The Effect of Nozzles and Nozzle Loadings on Shell Buckling." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45090.

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This paper investigates the effect of nozzles and nozzle loadings on the overall buckling capacity of a vessel subject to external pressure designed to ASME VIII Div 1. ASME VIII Div 1 provides a well-established design-by-rule (DBR) approach for vessels subject to external pressure, but this takes no consideration for the presence of openings or nozzles. There are empirical rules regarding nozzle reinforcement for external pressure, but these do not directly consider the buckling capacity of the overall vessel. This paper therefore assesses the impact of nozzles on the buckling capacity of a cylindrical shell, where the nozzle is reinforced as per code requirements. The effect of reduced reinforcement is also analyzed. Subsequently the effect of nozzle loads is also assessed. Nozzles are loaded with ‘allowable’ loads, determined using finite element analysis in accordance with industry practice and code principles. The buckling capacities are assessed using ASME VIII Div 2 Part 5 methods, using a parametric study with over 500 models. Variables considered are vessel diameter, vessel length, nozzle diameter, and both integral and pad-reinforced nozzles are used.
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Sakaki, K., and Y. Shimizu. "Effect of Increase in Entrance Convergent Section Length of Gun Nozzle on HVOF Thermal Spray Process and its Application to Nozzle Design for Cold Gas-Dynamic Spray Method." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0551.

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Abstract Nozzle geometry has a profound effect on HVOF spraying, influencing combustion gas dynamics as well as particle behavior. Nozzle dimensions are also important in cold gas-dynamic spraying (CGDS), particularly the length of the nozzle which affects gas flow temperature and speed. In this study, numerical simulations and experiments were conducted to determine how the length of the entrance convergent section of gun nozzles affects HVOF spraying. Process changes that occur inside the nozzle (as predicted by simulation) were correlated with coating properties. An Al2O3-TiO2 powder was used for the experimental studies. Changes in nozzle length had a significant impact on deposition efficiency, microstructure, hardness, and particle velocity. These relationships (as measured and calculated) were then applied to the nozzle design for the CGDS method.
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Mengle, Vinod. "Optimization of lobe mixer geometry and nozzle length for minimum jet noise." In 6th Aeroacoustics Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2000. http://dx.doi.org/10.2514/6.2000-1963.

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Mengle, Vinod, Willam Dalton, James Bridges, Kathy Boyd, Vinod Mengle, Willam Dalton, James Bridges, and Kathy Boyd. "Noise reduction with lobed mixers - Nozzle-length and free-jet speed effects." In 3rd AIAA/CEAS Aeroacoustics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1682.

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You might also be interested in the extended bibliographies on the topic 'Nozzle length' for particular source types:
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