Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

Xing, Yanxia

doi:10.1115/1.4023562

Cited by 26 publications

(13 citation statements)

References 21 publications

(30 reference statements)

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“…Generally, the best designs are in the range of H/d= 2-5, S/d= 6.5-10, θ = 60-90°, Vj = 44-50 m/s and Vw = 0.17-7 m/s. These results also have a correlation with literature for optimum value of design parameters for maximum area-averaged Nu number [3,7,11,13,14,17].…”

Section: Relative Surface Velocitysupporting

confidence: 82%

“…Badra et al [12] found that the optimal value of H/d=6-7 for the maximum stagnation Nu number from the single impinging jet. Xing and Weigand [13] found that H/d=3 could improve the heat transfer performance for a variety of crossflow configurations. Specht [14] found that for single nozzle arrays and hole channels the maximum heat transfer is at optimum S/d=6.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Optimization of Heat Transfer from Multiple Jets Impinging on a Moving Curved Surface for Industrial Drying Machines

Chitsazan¹,

Klepp²,

Glasmacher³

2021

IJHT

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Jet impingements enhance the heat and mass transfer rate in industrial drying machines. The designer should optimize the design parameters of industrial drying equipment to achieve maximum heat transfer rate. The heat transfer between multiple jets and a moving curved surface is more difficult to study due to the changing boundaries and the effect of surface curvature but is also very relevant in industrial drying applications. SST k-ω turbulence model is used to simulate a real geometry for industrial drying applications. The SST k-ω turbulence model succeeded with reasonable accuracy in reproducing the experimental results. The jet to surface distance, jet to jet spacing, jet inlet velocity, jet angle, and surface velocity are chosen as the design parameters. For the optimization of the impinging round jet, the average Nu number on the moving curved surface is set as the objective functions to be maximized. The SHERPA search algorithm is used to search for the optimal point from the weighted sum of all objectives method. One correlation is developed and validated for the average Nu number. It is found that the maximum average Nu number correlates with high values of jet inlet velocity (Vj), jet angle (θ) and jet to jet spacing (S/d) and low values of the jet to surface distance (H/d) and relative surface velocity (VR). The agreement in the prediction of the average Nu number between the numerical simulation and correlation is found to be reasonable and all the data points deviate from the correlation by less than 4%.

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Section: Relative Surface Velocitysupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Numerical Optimization of Heat Transfer from Multiple Jets Impinging on a Moving Curved Surface for Industrial Drying Machines

Chitsazan¹,

Klepp²,

Glasmacher³

2021

IJHT

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“…Recently in some papers (San and Chen, 2014;Yamane, et al, 2012;Mehryara andGiovanninib, 2014, Xing andWeigand, 2013), Nusselt number distribution on impinging wall of MIJ is reported,this distribution is of particular interest to researches. Thus we demonstrate the local heat flux on the impinging wall as the heat transfer performance of the MIJ.…”

Section: Fig 8 Contour Of Instantaneous Velocity Magnitudementioning

confidence: 99%

DNS analysis of multiple impinging jets

Koide

Tsujimoto

Shakouchi

et al. 2014

JFST

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] IntroductionImpinging jet is widely used for cooling of industrial applications such as electric device, blades of gas turbine, hot steel and so on, since it possesses high performance of heat transfer rate and is easier to implement into various system. Their characteristics are reviewed by a few notable literatures (Kataoka, 1990 ;Viskanta, 1993). So far, a few or several ten thousand Reynolds number, defined with inlet nozzle diameter, are mainly targeted in laboratory research. However, according to the downsizing of electronic equipments, several one hundred of Re numbers are going to be dealt with (Lee, et al., 2008). Impinging jets are subdivided into three regions, such as free jet region, stagnation region and wall jet region (Viskanta,1993). Their performance of heat transfer on the impinging wall is depending on the Re number, the shape of nozzle, the number of nozzle, the distance between the nozzle and the impinging wall and so on (Viskanta,1993). In particular, although a single impinging jet produces high heat transfer rate around an impinging position on an impinging wall, however the heat transfer performance decays with increasing the distance from the impinging position. Thus in order to overcome the shortcoming of single impinging jet (SIJ), i.e., the occurrence of both inhomogeneous heat distribution on the wall and the narrow heating area, multiple impinging jets (MIJ) are generally introduced in industrial applications. Thus far it is well-known that each jet of MIJ interacts with each other, producing the complex flow field (Geers, Hanjalić, and Tummers, 2006;Weigand and Spring, 2011). In addition, the heat transfer performance is significantly influenced with their interaction. Therefore to realize an optimum heat transfer performance, the influence of geometrical arrangement of jets, i.e., the separation length between jets, the arrangement pattern, should be investigated.Recently significant advances of computer power lead to the realization of fluid phenomena including miniature vortices through the direct numerical simulation (DNS). Under the state of the art, we found the effectiveness of the active control of a round jet for the mixing enhancement (Tsujimoto, et al., 2008). Also DNS of impinging jets are conducted so far (Tsubokura, et al., 2003;Hattori and Nagano, 2004) and highly resolved LES ( large eddy simulation ) (Hadžiabdić, and Hanjalić, 2007) has demonstrated the flow structure and the statistical properties of heat transfer. Hence at present it is capable of investigating systematically the effect of control parameter. AbstractIn order to elucidate the heat and flow characteristics of multiple impinging jet (MIJ), we conduct the DNS (direct numerical simulation) of four round impinging jet arranged at an inflow of flow field. To realize the high accurate computation, the discretization in space is performed with hybrid scheme in which sine or cosine series and 6th order compact scheme are used. For the surrounding boundary condition, in order to reduce the artificial n...

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“…), [6,7] and parameters (shape, number, etc.) [8,9] of the thin plates used. An ultrathick plate has a large thickness, high heat capacity, and long quenching time.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Mechanism for Roller Quenching with an Ultrathick Plate

Tian

Wang

et al. 2021

steel research int.

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The complexity of roller quenching equipment restricts research on the heat transfer mechanism of ultrathick plates, and the cooling law requires further clarification. In this study, the distributions of temperature gradient, average cooling speed, and heat loss during quenching are analyzed using a 220 mm thick steel plate, and inverse heat conduction is used to determine the surface heat transfer conditions. An ultrathick steel plate is subjected to high‐pressure and low‐pressure water in turn for strong and lasting cooling. Due to the different flow regions on the upper and lower surfaces, the flow from the lower nozzle is slightly higher than that from the upper nozzle, thereby resulting in a good cooling symmetry between the upper and lower surfaces. The results provide an important basis for the optimization of roller quenching technology for ultrathick steel plates.

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Optimum Jet-to-Plate Spacing of Inline Impingement Heat Transfer for Different Crossflow Schemes

Cited by 26 publications

References 21 publications

Numerical Optimization of Heat Transfer from Multiple Jets Impinging on a Moving Curved Surface for Industrial Drying Machines

Numerical Optimization of Heat Transfer from Multiple Jets Impinging on a Moving Curved Surface for Industrial Drying Machines

DNS analysis of multiple impinging jets

Heat Transfer Mechanism for Roller Quenching with an Ultrathick Plate

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