Heat transfer correlation of impinging jet array from pipe nozzle under fully developed flow

Wae-hayee, Makatar; Yeranee, Kirttayoth; Piya, Ibroheng; Rao, Yu; Nuntadusit, Chayut

doi:10.1016/j.applthermaleng.2019.03.044

Cited by 30 publications

(3 citation statements)

References 29 publications

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“…The single row gives higher Nusselt values as compared to two rows with the same mass flow rate. Wae-haeey et al [5] performed a heat transfer correlation for an impinging jet array discharged from pipe nozzles based on the peak of the average Nu number occurring at H/d = 4 in contrast to the case of impinging jet array discharged from orifice nozzles, in which the average Nu number decreased monotonically with jet to surface distance. Li et al [6] investigated the flow and heat transfer for parallel multiple jets: The heat transfer characteristics are highly dependent on Reynolds number, jet spacing, and separation distance.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer and Pressure Force from Multiple Jets Impinging on a Moving Flat Surface

Chitsazan¹,

Glasmacher²

2020

IJHT

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In this paper extensive numerical investigation of the heat transfer characteristics and the pressure force of jet impingement from the single row and multiple rows on a fixed and moving flat surface are reported. The computations were carried out over a wide range of parameters: relative nozzle-to-surface distance (H/d) from 0.5 to 6, relative nozzle to nozzle distances (S/d) from 4 to 10, jet angle from 45° to 90°, relative velocity ratio (Vplate/Vj) i.e. ratio of surface velocity to jet velocity from 0 to 1. The jet Reynolds number (Re) of 2,500, 3,400, 10,000, 20,000, and 23,000 and the number of jet rows of 1, 2, 4, and 8 have been used. It was found that the numerical accuracy by SST k-ω model is reasonably high to allow for a discussion of the main flow and heat transfer characteristics. The jet impingement heat transfer performance is generally enhanced with the increase of jet Reynolds number and jet angle and with the decrease of surface distance (H/d), jet distance (S/d) and the relative velocity ratio (Vplate/Vj) within the range examined. The pressure force coefficients on the impingement surface are relatively insensitive to Re number and the velocity ratio within the range examined, while it has highly dependent on H/d, S/d and jet angle. For multiple rows of aligned jet holes, the flow pattern exhibited a different shape due to the different intensity of the interference between adjacent air jets. The effect of multiple rows with regards to the impact on average Nu and pressure force coefficient for different geometry variations such as Re, H/d, S/d, VR and ɵ is negligible compared to the single row by approximately 9 and 13% in average respectively. Based on the computed results, equations of dimensionless parameters are correlated.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Heat Transfer and Pressure Force from Multiple Jets Impinging on a Moving Flat Surface

Chitsazan¹,

Glasmacher²

2020

IJHT

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“…The IJCF configuration provides high heat transfer rates in the stagnation region where the impinging jet impacts directly. However, the main disadvantage was the high energy consumption in these flow configurations [35]. These aspects improved the flow and heat transfer characteristics that have been extensively investigated over the last few years [36]- [38].…”

Section: Introductionmentioning

confidence: 99%

Parametric Study of Electronic Cooling by Means of a Combination of Crossflow and an Impinging Jet

et al. 2022

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This paper reports a parametric study's experimental results based on the experiments' design. No works in the literature have investigated parametrically experimental effects on electronic component cooling by combining an impinging jet and a channel flow configuration on the cooling of electronic components. This study analyzed five parameters experimentally to enhance the cooling process using statistical techniques. Additionally, the optimal configuration determined for the conventional cooling method using only the channel flow was compared. Three parameters are associated with the geometric configuration (height of the electronic component h/H = 1/6, 1/3, 1/2, jet diameter D/H = 0.3, 0.4, 0.5 and jet-component eccentricity S/H = 0, 1/8, 1/4), and the other two are related to the fluid flow (the Reynolds number based on the channel height and mean velocity of the stream ReH = 3410, 4205, 5000 and the ratio between the jet and the channel mean velocities Uj/Um = 2.5, 3.75, 5). The results show that the main parameters are statistically significant relative to heat transfer, with ReH, Uj/Um and h/H displaying the most significant amplitude of variation in response and increasing the Nusselt number by approximately 60%. The surface response models have shown a satisfactory fit with the experimental data, allowing, in a preliminary way, the minimum mechanical energy loss requirement to be identified to maximize up to 160% of the heat transfer. Specifically, the heat transfer enhancement is more significant for components of considerable height than other components. Heat transfer enhancement occurs at low mechanical energy loss when the velocity ratio decreases at the minimum channel Reynolds number at the maximum jet diameter and jetcomponent eccentricity.INDEX TERMS, optimization, electronic cooling, impinging jet, cross flow, design of experiments, response surface model.

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“…Jet impingement is widely used in cooling system about thermal equipment or industrial process that operate high temperature because it has high cooling capability in impingement region [1] and it is a rapid cooling system [2]. For example, it has been used for microelectronic components that are operated on extreme temperature condition [3][4][5], and quenching of steel plates during the manufacturing process that needs to control temperature on materials [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Flow and Heat Transfer Characteristics of Impinging Bubbly Jet

Aroonrujiphan¹,

Nuntadusit²

2020

ARFMTS

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The effect of adding air into water jet flow for heat transfer enhancement was investigated for submerged impinging jet. The Reynolds number of water jet was fixed at ReL = 2.4x10 4 , the nozzle to impingement surface distance was also fixed at L = 2D, and the volumetric fraction was varied from = 0.0 to 0.7. The heat transfer measurement was studied using an infrared thermal imaging camera. The flow behavior of bubbly jet was observed by a high-speed camera. The result showed that the heat transfer of the bubbly jet for all cases were higher than the water jet case. The average Nusselt number on surface was continuously increased for increasing volumetric fraction = 0.0 to 0.2. It was found that the volumetric fraction at = 0.2 gave the maximum heat transfer enhancement about 33% compared to case of water jet. But the increase of volumetric fraction in range = 0.2 to 0.7 decreased the average Nusselt number.

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Heat transfer correlation of impinging jet array from pipe nozzle under fully developed flow

Cited by 30 publications

References 29 publications

Numerical Investigation of Heat Transfer and Pressure Force from Multiple Jets Impinging on a Moving Flat Surface

Numerical Investigation of Heat Transfer and Pressure Force from Multiple Jets Impinging on a Moving Flat Surface

Parametric Study of Electronic Cooling by Means of a Combination of Crossflow and an Impinging Jet

Flow and Heat Transfer Characteristics of Impinging Bubbly Jet

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