Milliscale confined impinging slot jets: Laminar heat transfer characteristics for an isothermal flat plate

Lee, Dong Hoon; Park, Hyun Jin; Ligrani, Phil

doi:10.1016/j.ijheatmasstransfer.2012.01.041

Cited by 35 publications

(12 citation statements)

References 14 publications

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“…In order to evaluate the numerical results, variation of the local Nusselt number for impinging slot jet of air is compared with the results of Lee et al [11] in Figure 2 Pe = 1500 and A y = 1. An increase in Richardson number corresponds to an increase in the temperature gradient in the vicinity of the bottom wall.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, for a given Richardson number, the increase of generalized Prandtl number and wavelength of wavy surface leads to heat transfer enhancement. Lee et al [11] studied ow and heat transfer characteristics of a laminar milli-scale slot jet which impinges on an isothermal plate, eventually. It was found that for all of speci ed Reynolds numbers and aspect ratios, local Nusselt number decreases by lateral distance from the stagnation point.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Flow and Mixed convective Heat Transfer of Non-Newtonian Impinging Slot Jets

2017

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Abstract. Mixed convection heat transfer of non-Newtonian impinging slot jets was investigated numerically in this study. The simulation was performed using a temperaturedependent power-law viscosity model. The results showed that, for high Richardson numbers, a recirculation zone was created in the vicinity of impingement wall which prevents the jet stream from penetration into near wall region and decreases the Nusselt number around the stagnation point. The e ects of jet-to-plate spacing, inlet Peclet number, and jet inlet width on the ow structure and heat transfer characteristics of impinging jet were studied using the numerical results. By decreasing jet-to-plate spacing and jet inlet width and increasing inlet Peclet number, the ow reversal in the vicinity of heated wall disappeared, and the local Nusselt number increased as a result of deeper penetration of jet stream into the near wall region. Furthermore, the results indicate that the maximum local and average Nusselt numbers belong to the shear-thinning jets with minimum inlet width and minimum jet-to-plate spacing.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Flow and Mixed convective Heat Transfer of Non-Newtonian Impinging Slot Jets

2017

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“…Sadly, this study could not detect existing substantial and authentic data regarding experiments or numerical investigation of fluid flow parameters in the confined impinging slot jet in the context of hybrid nanofluid for numerical authentication of its results; thereby, it had to use the results of the following studies, conducted for air or nanofluid, as the criteria against which to validate its results: Li et al [3] , Lee et al [12], and Manca et al [7].…”

Section: Numerical Proceduresmentioning

confidence: 99%

“…In a curious experiment, Lee et al [12] investigated the following: the characteristics of heat transfer and the general visualized the flow of confined, laminar milli-scale slot jets impinged on an isothermal flat target plate, with a fullydeveloped profile located at the nozzle exit. They studied the impacts of Re and the normalized nozzle-to-plate distance ratio (H/B); concluding that the local Nu decreases in response to an increase in the lateral distance from the stagnation point for all Re and H/B values.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of hydrodynamic and thermal behavior of Al2O3/Water nanofluid and Al2O3-Cu/Water hybrid nanofluid in a confined impinging slot jet using two-phase mixed model

Izadikia

Mahdi

Mobini

2022

JMES

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This study utilizes the two-phase mixture model to conduct a numeric study of Al2O3/Water and Al2O3-Cu/Water (hybrid) nanofluid's hydrodynamic and thermal behavior in a laminar confined impinging slot jet in 50 ≤ Re ≤ 300 and nanoparticles volume fractions (NVF) ranging from 0 - 2%. This study considers various aspect ratios (H/W), including 2, 4, and 6, to investiate the confining effects. This paper gives a comparative analysis of nanofluids and hybrid nanofluids in terms of the parameters concerning the flow: Reynolds and local Nusselt number (Nux), average Nusselt number (Nuavg), flow lines' contour, and temperature distribution under similar geometric conditions and Reynolds number. In comparison with nanofluids, the hybrid nanofluids have higher local Nusselt number on the entire target surface, this advantage of hybrid nanofluid attribute to higher thermal conductivity of them. The average Nusselt numbers of nanofluids and hybrid nanofluids plotted at different Refor various aspect ratios(H/W=2,4), and the effect of aspect ratio and momentum are explained. Furthermore, pumping power of both fluid analysed for all nanoparticles volume fraction (0 - 2%) at different Reynolds number. The result shows that pumping power of hybrid nanofluid is higher than base fluid and nanofluid, because the dynamic viscosity of hybrid nanofluid is higher than base fluid (water) and nanofluid. Besides; the study identified some correlations in the hybrid nanofluids regarding the stagnation point and the average Nusselt numbers. Presumably, these correlations are valid under certain conditions: 50≤ Re ≤ 300, 2 ≤ H/W≤ 6, and volume fracture (0 - 2%).

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“…52,53 More recently, confined, milliscale unsteady laminar impinging slot jets are investigated as they influence surface Nusselt numbers with constant surface heat flux and constant surface temperature thermal boundary conditions. [54][55][56] Also considered are effects of confined impinging slot jets on heat transfer to concave and convex surfaces. 57 The structure of the associated vortices, which form within the shear layers, which are adjacent to the slot jets, are investigated using flow visualizations.…”

Section: Unsteady Milliscale Impingement Jets and Associated Vorticesmentioning

confidence: 99%

Propulsion Research and Academic Programs at the University of Alabama in Huntsville - 2018

Frederick

Ligrani

Thomas

2018

2018 Joint Propulsion Conference

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The UAH Propulsion Research Center (PRC) is beginning its 26 th year at the University of Alabama in Huntsville (UAH). The mission of the Propulsion Research Center is to provide an environment that connects the academic research community with the needs and concerns of the propulsion community while promoting an interdisciplinary approach to solving propulsion problems. This paper describes highlights from the research and academic programs associated with the center over the past eighteen months. Academic highlights include the offering of new graduate courses in liquid rocket engineering and solid rocket combustion instability. Research highlights include a new supersonic wind tunnel capability and a new program in nuclear thermal propulsion systems engineering. In the 2016 fiscal year, total research expenditures rose to $1.563 million and four Ph.D., eleven master's students, and numerous undergraduate students obtained degrees in conjunction with the center. The center continues to be a resource for both fundamental and applied research as well as a significant contributor to workforce development in the propulsion and energy field.

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Milliscale confined impinging slot jets: Laminar heat transfer characteristics for an isothermal flat plate

Cited by 35 publications

References 14 publications

Numerical Investigation on Flow and Mixed convective Heat Transfer of Non-Newtonian Impinging Slot Jets

Numerical Investigation on Flow and Mixed convective Heat Transfer of Non-Newtonian Impinging Slot Jets

Numerical study of hydrodynamic and thermal behavior of Al2O3/Water nanofluid and Al2O3-Cu/Water hybrid nanofluid in a confined impinging slot jet using two-phase mixed model

Propulsion Research and Academic Programs at the University of Alabama in Huntsville - 2018

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