Jet impingement heat transfer – Part II: A temporal investigation of heat transfer and local fluid velocities

O’Donovan, Tadhg S.; Murray, Darina B.

doi:10.1016/j.ijheatmasstransfer.2007.01.047

Cited by 76 publications

(41 citation statements)

References 12 publications

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“…Figures 3a-d show the time-averaged streamlines and velocity magnitude. Figures 3e-h show the fluctuating wall-normal velocity magnitude, since u' has been related to the local heat transfer coefficient in continuous impinging jets [11]. All velocities are non-dimensionalised with the characteristic velocity U 0 .…”

Section: Flow Fieldmentioning

confidence: 99%

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Heat Transfer in Adjacent Interacting Impinging Synthetic Jets

Persoons

O’Donovan

Murray

2009

Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Heat Transfer Equipment; Heat Transfer in Electronic Equi

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An impinging synthetic jet can attain heat transfer rates comparable to a continuous jet, without net mass input. However it needs a forced cross-flow to supply fresh cooling medium. The vectoring effect of adjacent synthetic jets allows directing the flow by changing the phase between the jets. This study uses the vectoring effect of two adjacent synthetic jets to draw in fresh air, while maintaining high impingement cooling performance.The experimental approach applies infrared thermography and particle image velocimetry to quantify the local convective heat transfer and flow field, respectively. The heat transfer profiles for various phase differences have been compared to the mean flow field and wall-normal velocity fluctuation intensity.For a fixed operating point (stroke length and Reynolds number) and geometry, the cooling performance has been optimised for phase and jet-to-surface spacing, resulting in about 90% enhancement of the maximum and overall cooling rate compared to a single jet, without the need for external cross-flow forcing.

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Section: Flow Fieldmentioning

confidence: 99%

“…For continuous impinging jets, O'Donovan and Murray [11] have shown that the local heat transfer coefficient is correlated to the wall-normal velocity fluctuation u', close to the surface. When examining only the near-wall region, u' (Figs.…”

Section: Heat Transfer Profilesmentioning

confidence: 99%

Heat Transfer in Adjacent Interacting Impinging Synthetic Jets

Persoons

O’Donovan

Murray

2009

Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Heat Transfer Equipment; Heat Transfer in Electronic Equi

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“…They observed peaks in heat transfer distribution at locations where the velocity fluctuations in normal direction to impingement plate were high. Further O'Donovan and Murray [15] experimentally investigated the temporal nature of heat transfer and fluid flow with the values of all parameters being same as in their former study. They showed that the growth of vortices through the distance from the jet axis affected the heat transfer coefficient in the wall jet region.…”

Section: Experimental Studies On Impinging Flowsmentioning

confidence: 99%

Flow and thermal characteristics of jet impingement: comprehensive review

Shukla¹,

Dewan²

2017

IJHT

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A comprehensive review on jet impingement heat transfer is presented to consider the state-of the art in this field. Among all the single-phase heat transfer arrangements possible, it has the maximum heat transfer rate. A number of arrangements are possible to represent a practical or physical situation, such as, jet impingement on a solid flat surface or surface fitted with different kinds of turbulent promoters, inclined plane surface and cylindrical convex/concave surface, etc. A significant number of papers dealing with experimental and computational studies on different physical and computational aspects of jet impinging flows are reviewed. Several parameters were found to influence the characteristics, such as, flow confinement, nozzle shape, jet to plate spacing and Reynolds number. An extremely small number of studies dealing with application based jet impingement heat transfer configurations (e.g., ribs fitted impingement plate, moving impingement plate, etc) experimentally and numerically have been reported in the literature. Various computational approaches, such as, RANS, LES, DNS and hybrid models, that are used to study the jet impingement heat transfer, with their complexities and boundary conditions, have been reviewed. It was observed that majority of RANS based turbulence models did not predict impinging flows accurately and its complexities except a few. Many authors have reported that LES is capable of predicting the flow field and heat transfer data within the accepted accuracy limits. DNS can be applied to simple geometry with low Reynolds number. Recently some authors have employed hybrid models, such as, PANS, DES, etc., and concluded that these models provide reasonably accurate results and were found to be computationally less expensive than LES and DNS.

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“…The exhaust airflow can be adjusted with a frequency drive (6). The dynamic steam viscosity is determined by a viscometer (9), while its density is measured by a hygrometer (8), while the velocity is determined by the flow meter (7).…”

Section: The Test Setupmentioning

confidence: 99%

Sustainable Assessment of Aerosol Pollution Decrease Applying Multiple Attribute Decision-Making Methods

et al. 2016

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Air pollution with various materials, particularly with aerosols, increases with the advances in technological development. This is a complicated global problem. One of the priorities in achieving sustainable development is the reduction of harmful technological effects on the environment and human health. It is a responsibility of researchers to search for effective methods of reducing pollution. The reliable results can be obtained by combining the approaches used in various fields of science and technology. This paper aims to demonstrate the effectiveness of the multiple attribute decision-making (MADM) methods in investigating and solving the environmental pollution problems. The paper presents the study of the process of the evaporation of a toxic liquid based on using the MADM methods. A schematic view of the test setup is presented. The density, viscosity, and rate of the released vapor flow are measured and the dependence of the variation of the solution concentration on its temperature is determined in the experimental study. The concentration of hydrochloric acid solution (HAS) varies in the range from 28% to 34%, while the liquid is heated from 50 to 80˝C. The variations in the parameters are analyzed using the well-known VIKOR and COPRAS MADM methods. For determining the criteria weights, a new CILOS (Criterion Impact LOSs) method is used. The experimental results are arranged in the priority order, using the MADM methods. Based on the obtained data, the technological parameters of production, ensuring minimum environmental pollution, can be chosen.

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Jet impingement heat transfer – Part II: A temporal investigation of heat transfer and local fluid velocities

Cited by 76 publications

References 12 publications

Heat Transfer in Adjacent Interacting Impinging Synthetic Jets

Heat Transfer in Adjacent Interacting Impinging Synthetic Jets

Flow and thermal characteristics of jet impingement: comprehensive review

Sustainable Assessment of Aerosol Pollution Decrease Applying Multiple Attribute Decision-Making Methods

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