Jet‐Impingement Heat Transfer in Gas Turbine Systems

Han, Bumsoo; Goldstein, R. J.

doi:10.1111/j.1749-6632.2001.tb05849.x

Cited by 178 publications

(40 citation statements)

References 67 publications

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“…For many years, much research on flow and heat transfer characteristics of impinging jets has been conducted. Typical examples actively pursued were the effects of ejection parameter of a jet array containing multiple impinging jets, the jet hole diameter D, the Reynolds number Re, the injection distance from nozzle to target surface L, the jet-to-jet spacing S and the number of jet holes N (Han and Goldestein 2001;Zuckerman and Lior 2006). The interest in the studies is in the effects from the interaction between adjacent jets and crossflow on heat transfer performance.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional flow characterization of a square array of multiple circular impinging jets using stereoscopic PIV and heat transfer relation

Ichikawa

Motosuke

Kameya

et al. 2015

J Vis

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Impinging jets are one of the most industrially essential methods of cooling, for example, the cooling of gas turbine blades and electronic devices, drying or annealing of glasses. Usually, jets are configured for a specific purpose, but the flow tends to be very complicated as each jet interacts with the others, especially near the impingement surface. In the present study, complicated three-dimensional flow from a square array of circular impinging jets was revealed experimentally to investigate the effect on heat transfer characteristics. The flow field was measured by scanning stereoscopic particle image velocimetry to confirm the detailed spatial features of the multiple circular impinging jets as nozzle-to-surface distance and jet-to-jet spacing were changed. Adjacent jets generated vortex rings and roll-up toward the nozzle plate, vortex rings and roll-up sizes changing depending on the experimental parameters. Differences in vorticity and dispersions of velocity from the jets were also observed. The temperature field of the impingement surface was measured using a thermosensitive liquid crystal technique. The spatial distribution of heat transfer coefficient was related to the flow field near the impingement surface.Keywords Impinging jet Á 3D flow configuration Á Heat transfer Á Particle image velocimetry Á Thermosensitive liquid crystal method List of symbols D Jet hole diameter (m) h Local heat transfer coefficient [W/(m 2 K)] L Injection distance from nozzle to target surface (m) N Number of jet holes, N = 3 9 3 = 9, all number of particle image Nu Local Nusselt number q w Heat flux supplied to heat transfer surface (W/m 2 ) r Radial direction distance from central jet (m) Re Reynolds number based on jet hole diameter S Jet-to-jet spacing (m) T J Jet temperature (K) T w Wall temperature (K) U Mean flow velocity (m/s) U k Instantaneous velocity of image number k (m/s)

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Section: Introductionmentioning

confidence: 99%

Three-dimensional flow characterization of a square array of multiple circular impinging jets using stereoscopic PIV and heat transfer relation

Ichikawa

Motosuke

Kameya

et al. 2015

J Vis

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“…Many engineering applications currently use jet impingement to improve the cooling over a wide range of length scales and configurations. Han and Goldstein [2] reviewed jet array impingement heat transfer techniques used in gas turbine blades. They concluded that further investigation of the combined effects of some parameters, such as the crossflow, the impingement plate ''roughness'', and the jets nozzle shape to optimize turbine blades cooling.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics and heat transfer performances of a semi-confined impinging array of jets: effect of nozzle geometry

Dano

Liburdy

Kanokjaruvijit

2005

International Journal of Heat and Mass Transfer

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“…Whereas another review [2] is on experimental studies of single and multiple turbulent isothermal and impinging flame jets. Exclusive work in jet impingement heat transfer in gas turbine systems is reviewed in [3]. Most of the reported heat transfer distribution data to and from impinging jets is at steady state.…”

Section: Introductionmentioning

confidence: 99%

Transient heat transfer characterization of impinging hot / cold jets by analytical IHCP

Kadam

Hindasageri

Kumar

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Unknown transient surface temperature and heat flux distribution at the impingement side (front side) is estimated from known temperature distribution at non-impingement side (back side) using analytical solution to three dimensional inverse heat conduction problem (IHCP). Back side input temperature data are obtained by running forward code in Fluent. Hot as well as cold impinging jets are characterized with the help of this solution. Laminar and turbulent jets at nozzle to plate spacing (Z/d) equal to 4 are considered. Hot gas at temperature 500 K and 3000 K is impinged on a 1 mm flat plate which considered initially at temperature 300 K in case of heating application. Whereas in cooling application, flat plate is initially assumed at temperature 673 K and isothermal air jet at 293 K is impinged on it. The temperature and heat flux estimation data by present technique is in very good agreement with the simulation data.

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Jet‐Impingement Heat Transfer in Gas Turbine Systems

Cited by 178 publications

References 67 publications

Three-dimensional flow characterization of a square array of multiple circular impinging jets using stereoscopic PIV and heat transfer relation

Three-dimensional flow characterization of a square array of multiple circular impinging jets using stereoscopic PIV and heat transfer relation

Flow characteristics and heat transfer performances of a semi-confined impinging array of jets: effect of nozzle geometry

Transient heat transfer characterization of impinging hot / cold jets by analytical IHCP

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