Relevant bibliographies by topics / Single circular jet

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

Academic literature on the topic 'Single circular jet'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Single circular jet"

1

Hall, David E., Frank P. Incropera, and Raymond Viskanta. "Jet Impingement Boiling From a Circular Free-Surface Jet During Quenching: Part 1—Single-Phase Jet." Journal of Heat Transfer 123, no. 5 (March 22, 2001): 901–10. http://dx.doi.org/10.1115/1.1389061.

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This paper reports results from an experimental study of boiling heat transfer during quenching of a cylindrical copper disk by a subcooled, circular, free-surface water jet. The disk was heated to approximately 650°C, and as quenching occurred, transient temperature measurements were taken at discrete locations near the surface and applied as boundary conditions in a conduction model to deduce transient heat flux distributions at the surface. Results are presented in the form of heat flux distributions and boiling curves for radial locations varying from the stagnation point to ten nozzle diameters for jet velocities between 2.0 and 4.0 m/s 11,300⩽Red⩽22,600. Data for nucleate boiling in the stagnation region and spatial distributions of maximum heat flux are presented and are in good agreement with correlations developed from steady-state experiments. Spatial distributions of minimum film boiling temperatures and heat fluxes are also reported and reveal a fundamental dependence on jet deflection and streamwise location. A companion paper (Hall et al., 2001) describes single-phase and boiling heat transfer measurements from a two-phase (water-air), free-surface, circular jet produced by injecting air bubbles into the jet upstream of the nozzle exit.
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Hsieh, Shou-Shing, Jung-Tai Huang, and Huang-Hsiu Tsai. "Heat Transfer of Confined Circular Jet Impingement." Journal of Mechanics 17, no. 1 (March 2001): 29–38. http://dx.doi.org/10.1017/s1727719100002392.

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ABSTRACTExperiments for heat transfer characteristics of confined circular single jet impingement were conducted. The effect of jet Reynolds number, jet hole-to-plate spacing and heat flux levels on heat transfer characteristics of the heated target surface was examined and presented. The local heat transfer coefficient along the surface is measured and correlations of the stagnation point, local and average Nusselt number are developed and discussed. Finally, comparisons of the present data with existing results were also made.
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Ikegami, Y., K. Fujita, and M. Ohashi. "Nozzle jet flow-induced vibration of single circular cylinders and twin circular cylinders." Journal of Wind Engineering and Industrial Aerodynamics 49, no. 1-3 (December 1993): 207–16. http://dx.doi.org/10.1016/0167-6105(93)90016-h.

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Hall, David E., Frank P. Incropera, and Raymond Viskanta. "Jet Impingement Boiling From a Circular Free-Surface Jet During Quenching: Part 2—Two-Phase Jet." Journal of Heat Transfer 123, no. 5 (March 22, 2001): 911–17. http://dx.doi.org/10.1115/1.1389062.

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A proposed technique for controlling jet impingement boiling heat transfer involves injection of gas into the liquid jet. This paper reports results from an experimental study of boiling heat transfer during quenching of a cylindrical copper specimen, initially at a uniform temperature exceeding the temperature corresponding to maximum heat flux, by a two-phase (water-air), circular, free-surface jet. The second phase is introduced as small bubbles into the jet upstream of the nozzle exit. Data are presented for single-phase convective heat transfer at the stagnation point, as well as in the form of boiling curves, maximum heat fluxes, and minimum film boiling temperatures at locations extending from the stagnation point to a radius of ten nozzle diameters. For void fractions ranging from 0.0 to 0.4 and liquid-only velocities between 2.0 and 4.0 m/s 11,300⩽Red,fo⩽22,600, several significant effects are associated with introduction of the gas bubbles into the jet. As well as enhancing single-phase convective heat transfer by up to a factor of 2.1 in the stagnation region, addition of the bubbles increases the wall superheat in nucleate boiling and eliminates the temperature excursion associated with cessation of boiling. The maximum heat flux is unaffected by changes in the void fraction, while minimum film boiling temperatures increase and film boiling heat transfer decreases with increasing void fraction. A companion paper (Hall et al., 2001) details corresponding results from the single-phase jet.
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Chaudhry, Ishtiaq A., and S. Zhong. "A single circular synthetic jet issued into turbulent boundary layer." Journal of Visualization 17, no. 2 (April 5, 2014): 101–11. http://dx.doi.org/10.1007/s12650-014-0199-0.

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Manivannan, Ponnambalam, and Banbla Sridhar. "Characteristic study of non-circular incompressible free jet." Thermal Science 17, no. 3 (2013): 787–800. http://dx.doi.org/10.2298/tsci110208116m.

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This paper reports an experimental investigation of bulk properties of turbulent, which is three dimensional, incompressible, air jets issuing into still air surrounding from the nozzles. The jet orifices utilized included circular, hexagonal and cruciform geometries. Experimental results of pertinent mean flow properties such as axis velocity decay, half width growth, potential core and turbulence intensities are reported. Single Hotwire anemometer was used for measurements of the velocity field. The experiment for the three jets was conducted under the same nominal conditions with the exit Reynolds number of 15,400. Consistent with previous investigations of other non circular jets, the cruciform jet is found to have an overall superior mixing capability over the circular counter part. Immediately downstream of the nozzle exit, it entrains, and then mixes with, the surroundings at a higher rate. This jet has a shorter potential core with higher rates of decay and spread than the circular jet. This phenomenon of axis switching is also found to occur in this jet.
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Womac, D. J., S. Ramadhyani, and F. P. Incropera. "Correlating Equations for Impingement Cooling of Small Heat Sources With Single Circular Liquid Jets." Journal of Heat Transfer 115, no. 1 (February 1, 1993): 106–15. http://dx.doi.org/10.1115/1.2910635.

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Experimental data have been obtained for liquid jet impingement cooling of small square heat sources resembling electronic integrated circuit chips. Both free-surface and submerged jet configurations have been studied for a range of velocities, nozzle diameters, and nozzle-to-heater separation distances, with water and a fluorocarbon liquid (3M FC-77) as coolants. Major trends in the data have been explained in terms of the underlying hydrodynamic and thermal phenomena. The data, obtained over parameter ranges applicable to the cooling of microelectronic chips, have been compared with the predictions of previously developed correlations for jet impingement heat transfer and substantial discrepancies between the data and the predictions have been noted. Based on the present data, two new correlating equations, one for free-surface and the other for submerged jet impingement, have been developed and presented.
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THORPE, S. A., and I. KAVCIC. "The circular internal hydraulic jump." Journal of Fluid Mechanics 610 (August 8, 2008): 99–129. http://dx.doi.org/10.1017/s0022112008002553.

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Circular hydraulic jumps are familiar in single layers. Here we report the discovery of similar jumps in two-layer flows. A thin jet of fluid impinging vertically onto a rigid horizontal plane surface submerged in a deep layer of less-dense miscible fluid spreads radially, and a near-circular internal jump forms within a few centimetres from the point of impact with the plane surface. A jump is similarly formed as a jet of relatively less-dense fluid rises to the surface of a deep layer of fluid, but it appears less stable or permanent in form. Several experiments are made to examine the case of a downward jet onto a horizontal plate, the base of a square or circular container. The inlet Reynolds numbers, Re, of the jet range from 112 to 1790. Initially jumps have an undular, laminar form with typically 2–4 stationary waves on the interface between the dense and less-dense layers but, as the depth of the dense layer beyond the jump increases, the transitions become more abrupt and turbulent, resulting in mixing between the two layers. During the transition to a turbulent regime, single and sometimes moving multiple cusps are observed around the periphery of jumps. A semi-empirical model is devised that relates the parameters of the laboratory experiment, i.e. flow rate, inlet nozzle radius, kinematic viscosity and reduced gravity, to the layer depth beyond the jump and the radius at which an undular jump occurs. The experiments imply that surface tension is not an essential ingredient in the formation of circular hydraulic jumps and demonstrate that stationary jumps can exist in stratified shear flows which can be represented as two discrete layers. No stationary circular undular jumps are found, however, in the case of a downward jet of dense fluid when the overlying, less-dense, fluid is stratified, but a stationary turbulent transition is observed. This has implications for the existence of stationary jumps in continuously stratified geophysical flows: results based on two-layer models may be misleading. It is shown that the Froude number at which a transition of finite width occurs in a radially diverging flow may be less than unity.
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Trabold, T. A., and N. T. Obot. "Evaporation of Water With Single and Multiple Impinging Air Jets." Journal of Heat Transfer 113, no. 3 (August 1, 1991): 696–704. http://dx.doi.org/10.1115/1.2910620.

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An experimental investigation of impingement water evaporation under a single jet and arrays of circular jets was made. The parametric study included the effects of jet Reynolds number and standoff spacing for both single and multiple jets, as well as surface-to-nozzle diameter ratio and fractional nozzle open area for single and multiple jets, respectively. The nozzle exit temperature of the air jet, about the same as that of the laboratory, was 3–6° C higher than that of the evaporating water. Predictive equations are provided for mass transfer coefficient in terms of the flow and geometric conditions.
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Jambunathan, K., E. Lai, M. A. Moss, and B. L. Button. "A review of heat transfer data for single circular jet impingement." International Journal of Heat and Fluid Flow 13, no. 2 (June 1992): 106–15. http://dx.doi.org/10.1016/0142-727x(92)90017-4.

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Dissertations / Theses on the topic "Single circular jet"

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Bocking, C. E. "High speed selective jet electrodeposition of gold and gold alloys using single circular jets." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/6740.

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Myszko, M. "Experimental and computational studies of factors affecting impinging jet flowfields." Thesis, Department of Aerospace and Guidance Systems, 2009. http://hdl.handle.net/1826/3888.

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An experimental and computational study was made of a single circular jet impinging onto a flat ground board. A 1/2" nozzle running at a fixed nozzle pressure ratio of 1.05 was used in the experimental phase (giving an nozzle exit Reynolds number of 90xlO'), the nozzle to ground plane separation being varied between 2 and 10 nozzle diameters. Measurements were performed in the free and wall jets using single and cross-wire hot-wire anemometry techniques and pitot pressure probes in order to detemine mean velocity and normal and shear stress distributions. Some analysis is also presentedo f earlier measurementso n high pressurer atio impinging jets. Nozzle height was found to effect the initial thickness of the wall jet leaving the impingement region, increasing nozzle to ground plane separation increasing the wall jet thickness, although this separation distance did not seem to affect the rate at which the wall jet grew. Nozzle height was also found to have a large effect on the peak level of turbulence found in the wall jet up to a radial distan ce from the jet axial centre line of 4.5 nozzle diameters, after which the profiles become self-similar. Lowering the nozzle tended to increase the peak level measured in all the turbulent stresses within this development region. The production of turbulent kinetic energy in the wall jet, which is an indication of the amount of work done against the mean flow by the turbulent flow was found to increase dramatically with decreasing nozzle height. This was attributed to greater shearing of the flow at lower nozzle heights due to a thinner wall jet leaving the impingement region. A moving impingement surface was found to cause separation of the wall jet inner boundary layer on the 'approach' side leading to very rapid decay of peak velocity. The point of separation was found to occur at radial positions in the region of 7.0 to 8.0 nozzle diameters, this reducing slightly for lower nozzle heights. A parametric investigation was performed using the k-e turbulence model and the PHOENICS CFD code. It was found that due to inadequacies in the model, it failed to predict accurately the growth of the wall jet, both in terms of its initial thickness and the rate of growth. It did, however, predict an increase in wall jet thickness with both increasing nozzle height and exit turbulence intensity and decreasing nozzle pressure ratio. Modifications were made to the constants in the model to try and improve the predictions,w ith a limited degreeo f successT. he low Reynoldsn umber k-F-t urbulence model was shown to give a slightly improved non-dimensional wall jet profile, although this did not improve the predicted rate of growth of the wall jet.
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Books on the topic "Single circular jet"

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Bocking, C. E. High speed selective jet electrodeposition of gold and gold alloys using single circular jets. 1994.

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2

C, Bellavia David, and Ames Research Center, eds. Forces and pressures induced on circular plates by a single lifting jet in ground effect. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1991.

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Book chapters on the topic "Single circular jet"

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"The Ecology and Management of Wood in World Rivers." In The Ecology and Management of Wood in World Rivers, edited by MICHAEL MUTZ. American Fisheries Society, 2003. http://dx.doi.org/10.47886/9781888569568.ch5.

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<em>Abstract.</em>—Although submerged wood obviously influences the flow, little information exists on its various hydraulic effects in streams and rivers. This chapter gives a brief overview of the current knowledge about hydraulic effects of circular cylinders and simple tree shaped models and summarizes the few field data on wood induced hydraulics in streams and rivers. The focus is on the flow pattern and other effects of importance for instream ecology. The principal cross-flow field of a singular log perpendicular to flow is determined by the Reynolds number related to the log’s diameter. For the range of Reynolds numbers of logs and branches in streams and rivers (1 ‧ 10<sup>2</sup> to 1 ‧ 10<sup>6</sup>), the cross flow pattern is symmetrical, vortex streets shed, and a wake with reduced mean velocity develops behind the log. In the vertical confined flow of streams and rivers, the hydraulic effects depend on the blockage caused by the log, its distances to the water surface, and its distance to the streambed. The blockage determines the resistance to flow, the upstream afflux, the local flow acceleration, and the intensity of flow deflection. For logs within distances of 2 diameters to the water surface, the relative submergence and the Froude Number determine the highly variable local cross-flow field. For logs near the streambed, the form and roughness of the bed and the size of the gap to the bed control the hydraulics. Submerged jet-like flows, which cause local scour, are reported, but detailed information on the hydraulics of logs close to a natural streambed is missing. For logs in close contact to or partly embedded into the bed, the principal flow pattern of recirculating vortices attached to the bed develop in front and behind the logs. The extent of these vortices and the extent of the wake behind the logs appear to be larger in sand-bed streams than in flumes with smooth and level beds. Complex dense wooden objects and wood accumulations are comparable to solid structures. Their flow field is determined by the size of the bluff surfaces and the shedding from edges obtuse to flow. Wood spread out at the streambed causes skin roughness, and models based on technical roughness approximate the resulting near-bed flow regime. The general validity of most findings in streams and rivers is still vague since they are supported by only few data. Further flow data from the field and from flume experiments that simulate the complexity of the natural environment are needed.
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Conference papers on the topic "Single circular jet"

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Boopathi sabareesh, V., K. Srinivasan, and T. Sundararajan. "Screech Tone Suppression in Non Circular Twin Jet." In ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30472.

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The acoustic characteristics of twin jet screech tone is studied for various jet configurations such as both square and diamond. The measurement is carried out along the jet direction for various angles at two different planes using a microphone and the jet flow visualization is done by the shadowgraph technique. It is observed that the screech tone suppression is taken place for diamond jet configuration for the small jet spacing S = 0.5. By comparing the directivity pattern of twin jets with single jet, it is found that the twin jet behave as a single jet at higher nozzle pressure ratio.
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Guo, Zhiqiang, Mei Zheng, Yinze Liu, and Wei Dong. "Investigations of Single Jet Impinging on Plates With Circular Dimples." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-64052.

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In this paper, experimental and numerical investigations are both conducted to study the effect of circular dimples on the heat transfer performance of jets impingement. The circular dimples, set as one kind of surface structures on flat plate, have the same diameter of 3 mm but with different depths: 1.2 mm, 0.9 mm and 0.6 mm. Furthermore, in order to understand the mechanism of impingement heat transfer with circular dimples deeply, three different jet locations are studied in this paper. For the experimental investigations, the infrared thermography is applied to gain the temperature distributions on the flat plate. A comparison is made between the numerical results and experimental data, which indicates that they are in good agreement. The numerical results show that the dimples on the plates have significant effects on the impingement heat transfer. The overall averaged and local heat transfer coefficient in a single jet impingement on the smooth and dimpled plates are obtained and compared, as well as the flow structure. The effect of the dimples on the heat transfer performance of the target plates is different for different locations of dimples. Velocity distributions and streamlines near the target plates are also shown to explain the heat transfer characteristics. From the investigations, for the dimpled plates with different depths, the deeper dimples have the better averaged heat transfer on the target plates. The dimpled surface enhances the heat transfer performance obviously with H/D of 1.5. However, with the distance between the impinging hole and the target plate increasing, the transition location of the impact zone and the wall jet zone advances and the enhancement effect decreases. Moreover, further downstream region on the dimpled plates shows lower heat transfer enhancement effect and the effect becomes approximately invisible after X/D is larger than 3. The fluid in the dimples with different depths has the same streamline. The heat transfer enhancement at the downstream of dimples is better than the upstream.
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Spring, Sebastian, Bernhard Weigand, Werner Krebs, and Matthias Hase. "CFD Heat Transfer Predictions of a Single Circular Jet Impinging with Crossflow." In 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-3589.

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Liu, Cuicui, Zeyi Jiang, Xinxin Zhang, Qiang Ma, and Yusheng Sun. "Investigation of Circular Water Jet Impingement Heat Transfer." In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44495.

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Mathematical model combining theoretical analysis approach and differential numerical solving techniques has been set up to predict the free surface water jet impingement heat transfer. Heat transfer properties are obtained and validated by comparison with experiments. The characteristic of Nu-r/d distribution is discussed and the effect of nozzle diameter is analyzed. In addition, nozzle arrangements are studied for water jet equipment designation purpose. The results show that: Reynolds number is the dominate parameter in Nu-r/d distribution and area-averaged Nusselt number increases with increasing nozzle diameter. The best heat transfer effect appears when the aspect ratio of rectangular surface equals to 1. Fewer nozzles and bigger single impinged area could get larger Nusselt number under a given total water flow rate and given total impinged area. At a constant flow rate, larger nozzle diameter and smaller Reynolds number present a larger Nusselt number.
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Demauro, Edward, Chia Leong, and Michael Amitay. "Interaction of a Single Synthetic Jet with a Finite Aspect Ratio Circular Cylinder." In 6th AIAA Flow Control Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-3043.

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Rama Kumar, B. V. N., and B. V. S. S. S. Prasad. "Experimental Investigation of Flow and Heat Transfer for Single and Multiple Rows of Circular Jets Impinging on a Concave Surface." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51044.

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Flow and heat transfer characteristics for single and multiple rows of circular jets impinging on a concave surface are investigated experimentally. The dimensions of the concave target plate, impingement tube, orifice diameter, intra jet spacing are so selected that the present system represents a scaled-up (30:1) model for the leading edge of a typical gas turbine nozzle guide vane. The target plate is kept at a distance of one orifice diameter from the impingement tube, whilst the ratio of inter-jet distance to jet diameter is maintained at a value of 5.4. The parameters which are varied in the study include jet Reynolds number (Red = 2847–19300) and number of rows (nR = 1 and 5).The local dimensionless pressure and Nusselt number variations along the concave plate are presented at these parameters. A performance number named Thermo Hydrodynamic Performance Ratio (THPR) is introduced to evaluate different configurations on the basis of a combined pressure drop and heat transfer. Usage of multiple jets appears to offer much better THPR than that of single jet or single row of jets, for a chosen plenum condition.
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Fabbri, Matteo, Shanjuan Jiang, and Vijay K. Dhir. "Experimental Investigation of Single-Phase Micro Jets Impingement Cooling for Electronic Applications." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47162.

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Impinging jets for cooling of electronic equipment have been used by many researchers. Only few studies using arrays composed of a small number of jets are available in the literature. When very small jet diameters are used, the jet Reynolds number becomes quite small and no data are available for Reynolds number values below 500. In this work attention has been focused on circular arrays of free surface micro jets. Experiments were conducted by employing three jet pitches, 1, 2 and 3 mm and four jet diameters 50, 100, 150 and 250 μm and two different fluids, DI water and FC 40. The jet Reynolds number range was varied between 90 and 2000 while the Prandtl number varied from 6 to 84. Heat fluxes as high as 250 W/cm2 could be removed when water was utilized. Experimental data have been correlated within ±20%.
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Le´on De Paz, Marcel, and B. A. Jubran. "Predictions of Thermal and Hydrodynamic Characteristics of a Single Circular Micro-Jet Impinging on a Flat Plate." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50490.

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Jet impingement cooling remains one of the key methods in various high-end cooling applications as it can induce higher heat transfer rates. The objective of this preliminary investigation is to shed some light on micro-impingement cooling and assess the accuracy for a future 3-dimensional turbine blade model. For the purpose of this study, several micro-jet impingement cases are modeled in Gambit and iterated with Fluent. The reference model consists of a single 500μm cylindrical nozzle impinging on a constant temperature flat plate. Conducive results were found on the effects of turbulence model, Reynolds number, and H/D ratio for the Nusselt distribution on the flat plate. The Reynolds numbers iterated were: 2000, 3000, 4000, 5000, and 6000. The different H/D ratios modeled were: 6, 5, 4, 3, 2, 1. In general, it was observed that a higher Reynolds number increased the heat transfer on the plate, but the jet to target spacing had no significant impact on it. All results were validated via comparison with several published experimental data, the deviation margins indicated a good agreement.
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Amini, Ghobad, and Ali Dolatabadi. "Breakup of Liquid Jets Emerging From Elliptic Orifices." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45390.

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Passive control can result in increasing fuel efficiency and reducing combustion instabilities of gas turbine spray combustors. Through the use of geometric modifications of the conventional circular nozzles, this method potentially enhances mixing which is responsible for entraining the bulk air necessary for combustion. Several studies show that elliptic jets have higher mass entrainment and spreading rate compared to the equivalent circular jets [1]. The majority of these works have been limited to gaseous jets. The present study focuses on a liquid spray discharging into still ambient air from a single-hole injector with elliptic cross-section. The primary breakup is investigated using a theoretical approach. Characteristics of elliptic orifice jet are compared with circular orifice jet under different breakup regimes and various nozzle geometries.
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Ekkad, Srinath V., Shichuan Ou, and Richard B. Rivir. "Effect of Jet Pulsation and Duty Cycle on Film Cooling From a Single Jet on a Leading Edge Model." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60466.

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The effect of jet pulsation and duty cycle on film effectiveness and heat transfer was investigated on a film hole located on the circular leading edge of a blunt body. A transient infrared technique was used to measure both heat transfer coefficients and film effectiveness from a single test. Detailed Frossling number and film effectiveness distributions were obtained for all flow conditions. Jet pulsing frequencies of 5 Hz, 10 Hz, and 20 Hz have been studied. The effect of duty cycle created by the valve opening and closing times was also set at different levels of 10%, 25%, 50%, and 75% of designated 100% fully open condition for different blowing ratios from 0.25 to 2.0. The combination of pulse frequency and duty cycle was investigated for different blowing ratios on a single leading edge hole located at 22-deg from geometric leading edge. Results indicate that higher effectiveness and lower heat transfer coefficients are obtained at the reduced blowing ratios which result from reduced duty cycles. The effect of varying the pulsing frequency from 5 Hertz to 20 Hertz is not discernable beyond the level of experimental uncertainty. Effective blowing ratio due to lowering of the duty cycle at a given blowing ratio seems to plays a more important role in combination with pulsing which provides improved cooling effectiveness at lower heat transfer coefficients.
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