Heat transfer coefficients during the impingement cooling with the use of synthetic jet

Gil, Paweł; Wilk, Joanna

doi:10.1016/j.ijthermalsci.2019.106132

Cited by 40 publications

(7 citation statements)

References 30 publications

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“…One of the methods often employed to achieve that goal is the impinging jet. Recently, a regular continuous jet has been increasingly replaced in various applications by a synthetic jet (SJ) which provides better cooling and heat transport properties [1,2]. The SJs are particularly useful in the LED cooling systems such as SynJet ® [3] or the configuration investigated in [4].…”

Section: Introductionmentioning

confidence: 99%

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

et al. 2020

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The acoustic and flow aspects of the novel synthetic jet actuator (SJA) with fins inside the cavity were experimentally investigated for three types of enclosure design and two models of loudspeaker. The aim of the study is to find the parameter which connects the flow and acoustic properties of the SJA and allows us to choose the optimal solution in those regards. The hot wire anemometry was used for the velocity measurements and the sound pressure level was measured with a sound level meter. The model of the loudspeaker turned out to have a significantly stronger impact on the flow parameters and noise level than the shape of the fins in the cavity. The parameter that showed a dependence on the shape of the fins was the actuator’s efficiency. A ratio of the root-mean-square velocity at the orifice axis to the sound pressure level (U0.c/SPL) was used to connect the acoustic and flow properties of the tested actuators. This parameter was subsequently applied to determine the best configuration among the tested actuators.

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Section: Introductionmentioning

confidence: 99%

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

et al. 2020

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“…A maximum Nu of 72 was achieved for jet-target spacing = 4 and operational frequency = 5 Hz when the adiabatic wall temperature was used as a reference temperature while defining the convective heat transfer coefficient. Gil and Wilk [111] performed an experimental investigation to study heat transfer performance of synthetic jet impingement. In this setup, a special actuator comprising a loudspeaker and a Plexiglass cavity was used to create the synthetic jet (see Figure 12).…”

Section: Excited Jetsmentioning

confidence: 99%

“…Schematic diagram of the experimental setup for synthetic jet impingement using a special actuator comprising a loudspeaker and a Plexiglass cavity. Adopted from[111].…”

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confidence: 99%

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

et al. 2021

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Jet impingement is considered to be an effective technique to enhance the heat transfer rate, and it finds many applications in the scientific and industrial horizons. The objective of this paper is to summarize heat transfer enhancement through different jet impingement methods and provide a platform for identifying the scope for future work. This study reviews various experimental and numerical studies of jet impingement methods for thermal-hydraulic improvement of heat transfer surfaces. The jet impingement methods considered in the present work include shapes of the target surface, the jet/nozzle–target surface distance, extended jet holes, nanofluids, and the use of phase change materials (PCMs). The present work also includes both single-jet and multiple-jet impingement studies for different industrial applications.

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“…Innovation on jet impingement optimisation still continues to show promise, with recent modifications such as synthetic modification to the jet, via acoustic excitation showing increases in vortex strength, and flow control [13]. Modern additive manufacturing (AM) technology is also allowing for reviewed investigation into other techniques such as fluidic oscillators in the turbine cooling application, with potential to provide an oscillating jet of cooling air through a wide fan angle [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Heat Transfer Investigation of Impingement Jet Nozzle Position in Concave Double-Wall Cooling Structures

Wright

Ahmed

Yan

et al. 2021

Heat Transfer Engineering

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In this paper, experimental and numerical study has been carried out to investigate impingement cooling with a row of five circular jets, varied between target positions on a realistic leading edge region of a gas turbine blade geometry. Experimental data is collected from a transient thermochromic liquid crystal measurement technique at the target surface.Numerical study was conducted with the geometry using commercial computational fluid dynamics software to analyse the fluid flow. The unique aims of the study are to observe the effects of variation in jet location, and those specific to realistic target and nozzle geometries.Distributions of local and average Nusselt number show that a location targeting the concave surface at 90° demonstrates an overall higher heat transfer coefficient, especially in the stagnation region, and towards the aerofoil sides, with significantly less swirl. The experiment was performed with the following parameters: distance from nozzle to target of 1.7 to 2.1 jet diameters, pitch between jets of 4.4 jet diameters, and concave target diameter of 8.0 jet diameters. The jet Reynolds number range during this test was 20,000 -40,000. A standard flat target plate impingement test is also experimentally conducted and compared against existing literature for method validation.

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Heat transfer coefficients during the impingement cooling with the use of synthetic jet

Cited by 40 publications

References 30 publications

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Heat Transfer Augmentation through Different Jet Impingement Techniques: A State-of-the-Art Review

Experimental and Numerical Heat Transfer Investigation of Impingement Jet Nozzle Position in Concave Double-Wall Cooling Structures

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