Systematic Numerical Studies on Heat Transfer and Aerodynamic Characteristics of Impingement Cooling Devices Combined With Pins

Funazaki, Ken-ichi; Hachiya, Kazunori

doi:10.1115/gt2003-38256

Cited by 15 publications

(10 citation statements)

References 8 publications

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“…Quan et al [10] measured the cooling performance of an impingement system combined with pin fins by using infrared technology, and the overall cooling effectiveness was above 0.8. Funazaki et al [11,12], Son, et al [9] and Yamawaki et al [13] investigated the impingement cooling combined with circular pin fins by using transient liquid crystal technology. Their results showed that the wetted-area averaged Nusselt number of pin-fin roughened target plate was lower than flat plate; however the total heat transfer quantity of the pin-fin roughened plate increased by up to 50%, and the maximum pressure loss only increased by 10%.…”

Section: Introductionmentioning

confidence: 99%

Numerical predictions of jet impingement heat transfer on square pin-fin roughened plates

Wan

Rao

Chen

2015

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Numerical predictions of jet impingement heat transfer on square pin-fin roughened plates

Wan

Rao

Chen

2015

Applied Thermal Engineering

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“…The transient liquid crystal method [22,23] is used to measure the heat transfer characteristics on the impingement surface. Transient liquid crystal technique is Additional Impingement jets In the present work, the liquid crystal (SPN/ R30C20W) was coated on the target surface, the thermochromic liquid crystal could work in a range of 30-50 °C by undergoing red-green-blue color change.…”

Section: Experimental Methodmentioning

confidence: 99%

The Effect of Weak Crossflow on the Heat Transfer Characteristics of Short-Distance Impinging Cooling

Zhang

et al. 2014

Journal of Heat Transfer

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T h e E ffect of W e a k C ro ssflo w on th e H e a t T ra n s fe r C h a ra c te ris tic s of S h o rt-D is ta n c e Im p in g in g C o o lin g This paper numerically and experimentally investigated the effect o f weak crossflow on the heat transfer characteristics o f a short-distance impinging jet. The Reynolds number o f the impinging je t ranged from 6000 to 15,000, and the mass velocity ratio (M) between the crossflow and the je t varied from 0 to 0.15. The separation distance (H) between the exit o f the je t nozzle and the impingement surface equals to the exit diameter (D) o f the impinging jet. In the experiments, the temperature distribution on the impingement target surface was measured using a transient liquid crystal method. In the numerical simula tion, a multiblock hexahedral mesh was applied to discrete the computational domain, and a commercial CFD package (ansys cfx-12.0) with a standard k-s turbulence model was used fo r computation. It was found that compared to the impinging cooling without crossflow, the heat transfer characteristics near the impinging stagnation point remained almost constant. At the same time, the presence o f crossflow decreased the heat transfer rate in the upstream region o f the impinging stagnation point, while increased that in the downstream o f the impinging stagnation point. Taken together, crossflow has a complex influence on the impinging cooling, which is highly dependent on the mass velocity ratio between the crossflow and the jet.

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“…Funazaki [7][8][9] and others have done some experiments on the influence of inner duct's height on the heat transfer enhancement, and the influence of the pin height and the arrangements on heat transfer by computation. Thus, a conclusion has been drawn that pins have great importance on strengthening heat transfer for laminated plate.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer Characteristic on Scalelike Platelet Inner Duct

Yuan

et al. 2012

Int. J. Turbo Jet-Engines

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Studies on the cooling effectiveness distribution between scalelike laminated plate cooling duct and routine round film hole with Numerical Investigation show that the inner duct structure of the scalelike laminated plate can even the temperature and velocity on the exit of the film hole and the arrangement of film holes can even the coverage of the film on the wall surface to lower the decline rate of the wall surface temperature; The scalelike inner duct structure can cause turbulence in the cooling air when they meet at the intersection, hence benefit the convection exchange inside the mental surface; The scalelike laminated plate can also twice the cooling effectiveness of the routine round film hole.

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Systematic Numerical Studies on Heat Transfer and Aerodynamic Characteristics of Impingement Cooling Devices Combined With Pins

Abstract: This paper deals with extensive numerical studies on heat transfer characteristics and fluid dynamics inside several impingement cooling devices combined with pins. As a numerical analysis tool, a commercial software CFX-4.4, AEA Technology, is used.

Cited by 15 publications

References 8 publications

Numerical predictions of jet impingement heat transfer on square pin-fin roughened plates

Numerical predictions of jet impingement heat transfer on square pin-fin roughened plates

The Effect of Weak Crossflow on the Heat Transfer Characteristics of Short-Distance Impinging Cooling

Numerical Investigation of Heat Transfer Characteristic on Scalelike Platelet Inner Duct

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