Jet Impingement Heat Transfer: Physics, Correlations, and Numerical Modeling

Zuckerman, Neil; Lior, Noam

doi:10.1016/s0065-2717(06)39006-5

Cited by 672 publications

(358 citation statements)

References 99 publications

Supporting

Mentioning

306

Contrasting

Unclassified

Order By: Relevance

“…In the f v  2 model, the fluctuating velocity component normal to streamline is used instead of k in a linear eddy viscosity formulation, so that overproduction of k is claimed to be suppressed. Also, Zuckerman and Lior (2006) reported that the SST k-ω model may give a similar performance as the f v  2 model provides for impinging jet problems. Moreover, unsteady characteristics of impinging jet were also studied with the use of Direct Numerical Simulation, see e.g.…”

Section: Impinging Jetmentioning

confidence: 92%

“…The wall-normal velocity component decreases quickly while the corresponding pressure increases rapidly. The turning flow has high normal and shear stresses which greatly affects the local transport properties (Zuckerman and Lior, 2006). The impingement region for round jets typically extends 1.2 nozzle diameters above the wall (Martin, 1977).…”

Section: Impinging Jetmentioning

confidence: 99%

See 1 more Smart Citation

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

Chen¹

2014

View full text Add to dashboard Cite

A well-functioning, energy-efficient ventilation system is of vital importance to offices, not only to provide the kind of comfortable, healthy indoor environment necessary for the well-being and productive work performance of occupants, but also to reduce energy use in buildings and the associated impact of CO 2 emissions on the environment. To achieve these goals impinging jet ventilation has been developed as an innovative ventilation concept.In an impinging jet ventilation system, a high momentum of air jet is discharged downwards, strikes the floor and spreads over it, thus distributing the fresh air along the floor in the form of a very thin shear layer. This system retains advantages of mixing and stratification from conventional air distribution methods, while capable of overcoming their shortcomings.The aim of this thesis is to reach a thorough understanding of impinging jet ventilation for providing a good thermal environment for an office, by using Computational Fluid Dynamics (CFD) supported by detailed measurements. The full-field measurements were carried out in two test rooms located in a large enclosure giving relatively stable climate conditions. This study has been divided into three parts where the first focuses on validation of numerical investigations against measurements, the second addresses impacts of a number of design parameters on the impinging jet flow field and thermal comfort level, and the third compares ventilation performance of the impinging jet supply device with other air supply devices intended for mixing, wall confluent jets and displacement ventilation, under specific room conditions. In the first part, velocity and temperature distributions of the impinging jet flow field predicted by different turbulence models are compared with detailed measurements. Results from the non-isothermal validation studies show that the accuracy of the simulation results is to a great extent dependent on the complexity of the turbulence models, due to complicated flow phenomena related to jet impingement, such as recirculation, curvature and instability. The f v  2 turbulence model shows the best performance with measurements, which is slightly better than the SST k-ω model but much better than the RNG k-ε model. The difference is assumed to be essentially related to the magnitude of turbulent kinetic energy predicted in the vicinity of the stagnation region. Results from the isothermal study show that both the SST k-ω and RNG k-ε models predict similar wall jet behaviours of the impinging jet flow. IVIn the second part, three sets of parametric studies were carried out by using validated CFD models. The first parametric study shows that the geometry of the air supply system has the most significant impact on the flow field. The rectangular air supply device, especially the one with larger aspect ratio, provides a longer penetration distance to the room, which is suitable for industrial ventilation. The second study reveals that the interaction effect of cooling ceiling, heat sources ...

show abstract

Section: Impinging Jetmentioning

confidence: 92%

Section: Impinging Jetmentioning

confidence: 99%

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

Chen¹

2014

View full text Add to dashboard Cite

show abstract

“…It is described in [14] and is seen in [4] as the most adapted model for impinging flows in the framework of 'classical' turbulence RANS closures. The k-ε Billard-Laurence model is described in [15].…”

Section: Reynolds Averaged Navier-stokes (Rans) Modellingmentioning

confidence: 99%

“…Consequently, many studies have been conducted on the visualization, qualification and comprehension of jet flow structures and heat transfer. Martin [1], Jambunathan et al [2], Viskanta [3] and Zukerman and Lior [4] have reviewed a large panel of jet impingement studies. The most widely studied configuration is a single jet issuing from a long tube or from a contraction nozzle.…”

Section: Introductionmentioning

confidence: 99%

A Combined Experimental and Numerical Investigation of the Flow and Heat Transfer Inside a Turbine Vane Cooled by Jet Impingement

Laroche

Fénot

Dorignac

et al. 2017

Volume 5A: Heat Transfer

View full text Add to dashboard Cite

show abstract

“…A study of the flowfield became available in [28], the drawback there being the validity for only very small Reynolds numbers (Re = 500) . The very recent surveys [29,30] still base their explanations on conjectural hand-drawn pictures. In fact, ref.…”

Section: Impinging Jetsmentioning

confidence: 99%

Flow pulsation in the near-wall layer of impinging jets

Tesař

2013

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. Pulsation of impinging jets promises to become a useful way towards achieving the highest possible rate of passive scalar convective transport between fluid and a wall. Author investigated experimentally steady and pulsated impingement by hot-wire anemometer traversing along a radial line at a small height above the impingement wall. The data have shown two conspicuous local maxima of fluctuation intensity. In an attempt to reach understanding of these phenomena, numerical flowfield computations were also made, fitted to the experimental conditions. Despite simplification (isotropic handling of unsteadiness, eddies computed as Reynolds-type phase averages) the synergetic approach (experiment & computation) revealed interesting correlation and resulted in useful interpretations of the old problem of the off-axis extremes -and also brings new views on their behaviour in the pulsating jet case.

show abstract

Jet Impingement Heat Transfer: Physics, Correlations, and Numerical Modeling

Cited by 672 publications

References 99 publications

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

Experimental and numerical investigations of a ventilation strategy – impinging jet ventilation for an office environment

A Combined Experimental and Numerical Investigation of the Flow and Heat Transfer Inside a Turbine Vane Cooled by Jet Impingement

Flow pulsation in the near-wall layer of impinging jets

Contact Info

Product

Resources

About