Heat transfer and hydrodynamics of free water jet impingement at low nozzle-to-plate spacings

Kuraan, Abdullah M.; Moldovan, Stefan I.; Choo, Kyosung

doi:10.1016/j.ijheatmasstransfer.2017.01.084

Cited by 35 publications

(11 citation statements)

References 18 publications

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“…As already mentioned in Section IV (and Section S3 of [67]), H max is governed by the advancing contact angle on the domain outside the superhydrophilic annulus. Therefore, the momentum force per unit length at r > R j can be expressed as ρU 2 3 H max , where U 3 is governed by Eq. 12.…”

Section: Analysis and Design Ramificationsmentioning

confidence: 99%

“…Jet impingement on solid surfaces is important in several application areas, particularly in the high-rate heat transfer community [2]. Jets have been used for cooling metal surfaces [3,4], turbine blades [2], and electronic equipment [5,6], annealing and quenching of metals [2], boiling [7,8], atomization [9], as well as erosion of solid surfaces [10][11][12]. Apart from impermeable surfaces, jet impingement on permeable surfaces has found use in applications involving heat transfer from metal foams [13,14], boiling heat transfer [15], drying [16], and in incontinence products [17].…”

Section: Introductionmentioning

confidence: 99%

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Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

et al. 2019

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Liquid jet impingement on flat, impermeable substrates is important for a multitude of applications, ranging from electronic equipment cooling, to fuel atomization, and erosion of solid surfaces. On a wettable surface, where a sufficient downstream liquid depth can be sustained after axisymmetric impingement, the jet forms a thin film on the substrate up to a radial distance where the film height suddenly increases, forming a hydraulic jump. On a superhydrophobic surface, where a downstream liquid depth is not naturally sustained, the thin film expands and breaks up into droplets, which are subsequently ejected in a random fashion outward, as carried by their radial momentum. In the present work, a facile, scalable, wettability-patterning approach is presented for delaying or even eliminating droplet breakup in the case of jet impingement on horizontal superhydrophobic surfaces. An analytical expression for predicting the hydraulic jump and droplet breakup locations is developed to designate the proper wettability patterns that facilitate alteration and control of the post-impingement liquid behavior. The axisymmetric model is extended to evaluate the radial variation of the competing forces responsible for film breakup, and a design criterion for the effective wettability patterns is proposed.

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Section: Analysis and Design Ramificationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

et al. 2019

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“…Convective heat transfer from a wedge-shaped concave surface revealed that changing the geometry of the impinging surface may improve the heat transfer [13]. Depending on the needs various jet-to-plate distance (H/D) ratios from 0.08 [14] to 20.1 [15] were investigated for various impinging jet configurations.…”

Section: Introductionmentioning

confidence: 99%

Flow and heat transfer investigation of a circular jet issuing on different types of surfaces

Bolek

Bayraktar

2019

Sādhanā

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In the present study, flow and heat transfer characteristics of an impinging jet issuing from a circular cross-sectional pipe on a rectangular plate, convex and concave hemispheres were investigated numerically for various Reynolds numbers and jet-to-plate distances. Steady and three-dimensional Reynolds-Averaged Navier-Stokes equations were solved iteratively utilizing finite volume method. Turbulence model assessment study reveals that the transitional Shear Stress Transport k-x turbulence model can be used for such a problem. Regardless of the geometry of the impinging surfaces, two different flow regions were detected around y/D = 3. The first region starts from the stagnation point (y/D = 0) to the edge of the rectangular plate and hemispheres (y/ D = 3). In this region, the maximum heat transfer is obtained for the jet impinging on the rectangular plate. However, in the second region that covers the wall jet zone the impinging jet on the convex hemisphere provides the maximum while the concave causes the minimum heat transfer. The most efficient jet-to-plate distance is found as H/D = 2 in the first region while heat transfer does not change with distance in the wall jet zone. It was shown that Nusselt number increases with Reynolds number when the jet impinges on the concave and convex hemispheres as observed for the impinging jet on a flat plate.

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“…The parameters which are known to influence the rate of heat transfer between the jet and the target surface includes Reynolds number, level of turbulence, jet-to-target distance, intermittency, nozzle geometry, target surface roughness, and jet temperature [1,2]. Kuraan et al [3] performed a recent experimental study of a free water jet impinging a flat surface under the influence of jet-to-target distance of less than one. The effects of jet-to-target distance on stagnation point Nusselt number (N u ) and pressure were considered in this study under the influence of a wide range of R e between 4000 and 8053.…”

Section: Introductionmentioning

confidence: 99%

Flow Structure and Heat Transfer of Jet Impingement on a Rib-Roughened Flat Plate

et al. 2018

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The jet impingement technique is an effective method to achieve a high heat transfer rate and is widely used in industry. Enhancing the heat transfer rate even minimally will improve the performance of many engineering systems and applications. In this numerical study, the convective heat transfer process between orthogonal air jet impingement on a smooth, horizontal surface and a roughened uniformly heated flat plate is studied. The roughness element takes the form of a circular rib of square cross-section positioned at different radii around the stagnation point. At each location, the effect of the roughness element on heat transfer rate was simulated for six different heights and the optimum rib location and rib dimension determined. The average Nusselt number has been evaluated within and beyond the stagnation region to better quantify the heat transfer advantages of ribbed surfaces over smooth surfaces. The results showed both flow and heat transfer features vary significantly with rib dimension and location on the heated surface. This variation in the streamwise direction included both augmentation and decrease in heat transfer rate when compared to the baseline no-rib case. The enhancement in normalized averaged Nusselt number obtained by placing the rib at the most optimum radial location R/D = 2 was 15.6% compared to the baseline case. It was also found that the maximum average Nusselt number for each location was achieved when the rib height was close to the corresponding boundary layer thickness of the smooth surface at the same rib position.

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Heat transfer and hydrodynamics of free water jet impingement at low nozzle-to-plate spacings

Cited by 35 publications

References 18 publications

Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

Orthogonal liquid-jet impingement on wettability-patterned impermeable substrates

Flow and heat transfer investigation of a circular jet issuing on different types of surfaces

Flow Structure and Heat Transfer of Jet Impingement on a Rib-Roughened Flat Plate

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