Investigation for convective heat transfer on grinding work-piece surface subjected to an impinging jet

Zhang, Jingzhou; Tan, Xiaoming; Liu, Bo; Xingdan, Zhu

doi:10.1016/j.applthermaleng.2012.10.011

Cited by 23 publications

(15 citation statements)

References 21 publications

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“…In the present paper the computational model for such a nonisothermal flow is formulated and validated within the framework of the volume-of-fluid-based (VOF) method for free-surface capturing [2]. Due to its relevance in many fields in engineering and industry, interfacial multiphase flow modeling has been the subject of various investigations regarding impingement of liquid jet, droplet impact on surfaces, rising gas bubbles, flow in thin liquid sheets, atomization and some of the more recent contributions are given in [3,4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling and Simulation of Nonisothermal Free-surface Flow of a Liquid Jet Impinging on a Heated Surface

Berberović

Šikalo

2015

Procedia Engineering

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The study is aimed at formulating and validating the computational model for the nonisothermal two-phase flow with freesurfaces. The testing flow configuration consists of the liquid jet impacting on a heated wall generating simultaneous heat transfer from the wall surface. The interface capturing methodology implemented in the open-source software OpenFOAM based on the volume-of-fluid (VOF) model in the framework of Computational Fluid Dynamics (CFD) is extended to incorporate heat transfer. The potential of the model is evaluated by contrasting the results of numerical simulations to the existing experimental and numerical results. The computational procedure based on the numerical model demonstrates good qualitative and quantitative predictive capabilities by reproducing correctly the studied flow and heat transfer characteristics.

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Section: Introductionmentioning

confidence: 99%

Computational Modeling and Simulation of Nonisothermal Free-surface Flow of a Liquid Jet Impinging on a Heated Surface

Berberović

Šikalo

2015

Procedia Engineering

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“…In these studies, the character of coolant flow in the area of wheel-workpiece contact and the formation of an air barrier around the grinding wheel and its influence on the fluid flow behavior were also analyzed. The influence of grinding wheel velocity as well as air and fluid flow parameters on heat exchange [22] was also considered. Other studies undertaken concern the development of new wheel designs, as, e.g., with internal channels supplying coolant directly to the grinding zone [23].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of coolant flow in the grinding zone

Stachurski

Sawicki

Krupanek

et al. 2019

Int J Adv Manuf Technol

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The article presents results of research concerning computational fluid dynamics (CFD) of water oil emulsion in grinding zone during sharpening of hob cutter face surface. The numerical simulations made possible to determine the influence of different angular nozzle settings and nominal emulsion flow rate on the quantity of emulsion directly reaching the area of contact between the grinding wheel and the machined material. "SST k-ω" model, available in Ansys CFX program, was used in the numerical analysis; however, Kato and Launder's modifications were used in the model. Experimental tests were carried out in order to verify results obtained on basis of the numerical simulations. The percentage rate of grinding wheel clogging was used as a verifying parameter. Analysis of the clogging made it possible to indirectly evaluate results of the numerical simulation. The clogging measurements were carried out using optical method by taking microscopic images of the grinding wheel active surface (GWAS), which were later analyzed using an image analysis program. As a result of the conducted numerical simulations, it was concluded that the greatest effectiveness of emulsion provision into the grinding zone was obtained when the nozzle was set at the smallest of the examined angles (30°) and greatest of the examined nominal flow rates (7 l/min). This conclusion was confirmed with results of experimental tests, where it was also observed that increasing the nominal flow rate over 5 l/min does not have significant influence on the amount of clogging on the grinding wheel active surface.

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“…Three main approximations are made in the present physical model. Firstly, to solve the definition problem of the interface between a rotating disk and a stationary plate, a tiny gap of 0.02 mm is set between the rotating disk and the stationary plate [20]. Although this simplified case contrasts with the actual grinding process where the grinding wheel is in contact with the workpiece, it becomes feasible for inquiring the conjugate effect of swirl flow induced by the rotating disk and impinging jet in the current study.…”

Section: Description Of Physical Modelmentioning

confidence: 99%

“…To effectively cool the grinding zone, therefore, it was necessary to penetrate this boundary layer and this could only be achieved when the jet velocity was substantially greater than the tangential velocity of the wheel. Recently, Zhang et al [20] carried out an investigation to illustrate some of the flow and heat transfer characteristics that occurred when a single-air jet or mist/air jet impinged on a flat plate with a rotating disk mounted above the surface, representative of the workpiece in a grinding process. Their results showed that the coupled action of swirl air entrainment and jet impingement was benefit somewhat for overall convective heat transfer enhancement in relative to the case where the disk is stationary.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Jet Impingement Behaviors Affected by a Vertically Rotating Disk Suspended Close to the Surface

Liu

Zhang

Tan

2014

Mathematical Problems in Engineering

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A simplified physical model is built up to study the swirl flow effect induced by a rotating disk on the jet impingement behaviors, which is adopted to simulate the grinding process. To solve the definition problem of the interface between a rotating disk and a stationary plate in the computational simulation, a tiny gap is set between the rotating disk and the stationary plate. The results show that the rotating disk suspended above the surface adds more complexity to the flow field of jet impingement on a stationary plate. The swirling flow around the rotating disk obstructs the impinging jet flow to penetrate into the interfacial contact zone and forces the wall jet across the rotating disk to flow along transverse directions. For the given jet impinging velocity and nozzle orientation, as the disk rotational speed increases, the effect of the rotating disk on the impinging jet flow behaves more significantly. The impinging jet with small inject velocity is difficult to penetrate through the interfacial contact zone to follow by the disk swirl flows. For smaller jet impinging distance or larger oblique angle, the flow recirculation away from the interfacial contact zone becomes stronger.

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Investigation for convective heat transfer on grinding work-piece surface subjected to an impinging jet

Cited by 23 publications

References 21 publications

Computational Modeling and Simulation of Nonisothermal Free-surface Flow of a Liquid Jet Impinging on a Heated Surface

Computational Modeling and Simulation of Nonisothermal Free-surface Flow of a Liquid Jet Impinging on a Heated Surface

Numerical analysis of coolant flow in the grinding zone

Numerical Investigation on Jet Impingement Behaviors Affected by a Vertically Rotating Disk Suspended Close to the Surface

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