Experimental and numerical study on heat transfer characteristics of various geometrical arrangement of impinging jet arrays

Shariatmadar, Hamed; Mousavian, Shahab; Sadoughi, Mohammadkazem; Ashjaee, Mehdi

doi:10.1016/j.ijthermalsci.2015.11.007

Cited by 17 publications

(7 citation statements)

References 42 publications

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“…The values of the Nu exhibited a reasonable change with an increase or decrease in the distance values [28]. These results appear more logical when comparing to other research works [29].…”

Section: Model (3)supporting

confidence: 73%

Experimental and Numerical Simulation of the Heat Transfer Enhancement on the Twin Impingement Jet Mechanism

et al. 2018

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This article presents a study which sought to enhance heat transfer by employing a twin jet impingement mechanism (TJIM) and investigating the impact of the distance between the nozzles and plate on the Nusselt number (Nu) and heat transfer coefficient. This investigation was additionally based on the measurements of the heat flux temperature micro foil sensor and IR thermal imaging. A computational study of the cooling heated plate, through simulating the electronic components by the TJIM, was investigated using the RNG k-ε turbulence model. The jet-plate position was changed at the different jet-to-plate distances S = 1, 6, and 11 cm, Reynolds number = 17,000. The main flow structure, the static pressure, local and average Nus and heat transfer coefficient, were also examined. The findings have yielded new information about TJIM, and represent a new contribution about the flow and heat transfer characteristics of TJIM, and means of improving the rate of heat transfer in the passive heat transfer technique. The results of the various positions of the TJIM determined that the first model is, in fact, the best model for the heat transfer coefficient and the highest Nu, when S = 1 cm and H = 1 cm. Furthermore, the irregular distribution of the local Nu and the local heat transfer coefficient (h) on the impinged surface are due to the increase or decrease in the turbulence of flow on the measured surface.

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“…The values of the Nu exhibited a reasonable change with an increase or decrease in the distance values [28]. These results appear more logical when comparing to other research works [29].…”

Section: Model (3)supporting

confidence: 73%

Experimental and Numerical Simulation of the Heat Transfer Enhancement on the Twin Impingement Jet Mechanism

et al. 2018

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“…For instance, referring to the experimental results in Table 3 for 1 α = , and Re = 8700, the f -factor typically changes by 7-percent by increasing the spacing parameter, β , from 3 to 4. Shariatmadar et al (2016) also observed similar experimental trends and concluded that the flow characteristics were essentially unaffected by the variation of jet-to-jet spacing within the experimental limits studied.…”

Section: The Pressure Drop Coefficientsupporting

confidence: 62%

Flow Analysis of a Symmetrical Channel with Multiple Jets at the Upper Wall

Kayansayan¹

2020

ujme

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The objective of this study is to analyze experimentally and numerically the flow characteristics of a symmetric channel arisen from flow modeling of the blade cooling problem. The two ends of the flat channel are open and five evenly spaced air jets of equal strength at the upper wall configure a symmetrical flow around the mid-slot symmetry axis. The parameters that govern the flow characteristics of such a system are; the channel height, the jet spacing, and the jet velocity. In the analysis, the slot width is kept constant, but the channel height to slot width ratio

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“…The correct combination of these process variables enhances the flow interactions and increases the heat transfer performance. In this context, several experimental and numerical studies have been conducted to fully characterize the flow field and heat transfer of the multiple jet impingement process [1][2][3][4][5][6][7]. The flow complexity is increased if submerged and confined multiple jets are implemented.…”

Section: Introductionmentioning

confidence: 99%

Flow dynamics and heat transfer characterization of confined multiple jets impinging on a complex surface

Barbosa

Teixeira

2022

Preprint

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Submerged and confined multiple jet impingement is widely implemented in cooling applications since it provides high heat transfer coefficients and heat transfer uniformity. Its performance depends on several variables that make it complex and difficult to control. To understand the physical phenomena and characterize the flow field, an in-depth study using Particle Image Velocimetry (PIV) technique and heat transfer sensors is conducted in this study. The PIV measurements provide relevant data, but their accuracy depends on an effective experimental setup and a careful selection of the most appropriate tracer particles. Therefore, this work presents the experimental apparatus and comprises an analysis of the efficiency of different seeding particles. The results demonstrate the complexity of the jet flow impinging on a step surface, which induces a strong flow reversal that affects the jet flow development and the interaction with the adjacent jets. The large-scale structures induced in the vicinity of the target plate are captured by the PIV, as well as the strong fountain flows generated between the adjacent jets. This increased turbulence leads to an increase in heat transfer which is measured by the heat flux sensors, corresponding to a Nusselt number 25% greater for the case of a 2 D step plate. Through this study, relevant insights for several engineering applications that use multiple jet impingement are provided, highlighting that the combination of PIV and heat flux sensors is appropriate to characterize the jet’s flow dynamics and the heat transfer of this complex process.

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Experimental and numerical study on heat transfer characteristics of various geometrical arrangement of impinging jet arrays

Cited by 17 publications

References 42 publications

Experimental and Numerical Simulation of the Heat Transfer Enhancement on the Twin Impingement Jet Mechanism

Experimental and Numerical Simulation of the Heat Transfer Enhancement on the Twin Impingement Jet Mechanism

Flow Analysis of a Symmetrical Channel with Multiple Jets at the Upper Wall

Flow dynamics and heat transfer characterization of confined multiple jets impinging on a complex surface

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