Numerical investigations of heat transfer and pressure drop characteristics in multiple jet impingement system

Penumadu, Prithvi Sai; Rao, Arvind Gangoli

doi:10.1016/j.applthermaleng.2016.09.057

Cited by 69 publications

(25 citation statements)

References 23 publications

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“…The free jet region can be further divided into three regions: potential core region, developing zone and fully developed zone. 28) If the initial jet velocity Uo upon exiting increased to Umax within the potential core, then the velocity decreased beyond the potential core. At the stagnation point the pressure is higher than the ambient pressure, resulting in a favorable pressure gradient that turns the flow to a direction parallel to plate, forming the wall jet region.…”

Section: Heat Transfer Characteristics Of Moving Slit Jet Impingementmentioning

confidence: 99%

Heat Transfer Characteristic of Slit Nozzle Impingement on High-temperature Plate Surface

Wang¹,

Liu²,

Zhang³

et al. 2019

ISIJ Int.

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Section: Heat Transfer Characteristics Of Moving Slit Jet Impingementmentioning

confidence: 99%

Heat Transfer Characteristic of Slit Nozzle Impingement on High-temperature Plate Surface

Wang¹,

Liu²,

Zhang³

et al. 2019

ISIJ Int.

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“…In addition, Wen et al [16] confirmed the good accuracy of the SST k-ω model especially in the stagnation zones of the jets. A recent study performed by Penumadu & Rao [17] revealed that the heat transfer characteristics are well predicted by SST k-ω model, mainly due to its ability to handle accurately regions with high pressure gradients.…”

Section: Mathematical Model and Numerical Methodsmentioning

confidence: 98%

Experimental and numerical analysis of the influence of the nozzle-to-plate distance in a jet impingement process

Barbosa

Teixeira

2020

International Journal of Thermodynamics

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Jet impingement is a complex heat transfer technique which involves several process variables, such as nozzle-toplate distance, jet diameter, Reynolds number, jet temperature, among others. To understand the effect of each variable, it is important to study them separately. In industrial applications that use forced convection by air jet impingement, such as reflow soldering, the correct analysis of the flow structure and accurate definition of the variables values that affect the heat transfer over the target surface leads to an increase of the process performance decreasing the manufacturing costs. To reduce costs and time, the introduction of numerical methods has been fundamental. Using a Computational Fluid Dynamics software, the number of experiments is highly reduced, being possible to focus on the phenomena that are highly relevant for the purpose of the study. In this work, the nozzle-to-plate distance (H/D) variable is analyzed. This is considered one of the most important parameters since it influences the entire structure of the jet flow as well as the heat transfer coefficient over the target surface. The results present a comparison between different H/D under isothermal and non-isothermal conditions for a Reynolds number of 2,000.

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“…Ozmen & Ipek [ 9 ] demonstrated that Realizable k - ω turbulence model is capable to predict the flow and heat transfer characteristics with success in moderate values of nozzle-to-plate distances. Penumadu & Rao [ 10 ] revealed that the heat transfer characteristics are better predicted by SST k - ω model essentially due to its ability to accurately handle regions with high pressure gradients. According to these authors, the SST k - ω model was revealed both as accurate and computing time saving in engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Single Jet Impinging a Flat and Non-flat Plate

Barbosa

Teixeira

2020

Computational Science and Its Applications – ICCSA 2020

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The complexity of the flow field and heat transfer in jet impingement has led to several studies in order to increase the processes and products performance. Jet impingement is widely implemented, since it ensures high average heat transfer coefficients and the uniformity of the temperature over the target surface. However, the flow generated depends on several parameters related to the jet flow, such as jet velocity and temperature, and the target plate geometry. Complex impinging surfaces are identified in the majority of the applications, such as reflow soldering and cooling of turbines or solar systems. To increase the process efficiency, it is important to fully understand the interactions between the jet and the target surface. Considering the interest of this field, the present study is conducted to investigate the influence of the target surface on heat transfer in a single jet impingement process. To minimize the number of experiments, decreasing time and costs, the implementation of numerical tools is fundamental. In that sense, the impingement of the hot air jet over a flat and non-flat plate was predicted numerically using the ANSYS FLUENT software. The velocity and temperature profile were analyzed and the Nusselt number were compared for both cases. The results show the complexity of the flow generated in the vicinity of the step and the changes of the jet flow structure when it impinges a complex surface.

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Numerical investigations of heat transfer and pressure drop characteristics in multiple jet impingement system

Cited by 69 publications

References 23 publications

Heat Transfer Characteristic of Slit Nozzle Impingement on High-temperature Plate Surface

Heat Transfer Characteristic of Slit Nozzle Impingement on High-temperature Plate Surface

Experimental and numerical analysis of the influence of the nozzle-to-plate distance in a jet impingement process

Numerical Analysis of Single Jet Impinging a Flat and Non-flat Plate

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