Liquid films formed by means of rotating disks

Dixon, B. E.; Russell, A.; Swallow, J. E.

doi:10.1088/0508-3443/3/5/511

Cited by 3 publications

(3 citation statements)

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“…(2-9) is presented in Table I by defining the periphery of the sphere of influence in terms of the energy of vaporization as e(dQ) = X, one can express the evaporation probability at the surface as: Here p is the mass density of the evaporating substance, N is the molecular density, and the rate constant, j , is described by the © expression: j e = Be"X/kT . (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14) By relating the frequency factor B to the activation energy of the evaporating molecules, based on a free volume model description of the liquid sta te , the following equation was obtained for the evapora tion rate: In order to adapt the original equipment for the experimental rate studies in this research several design changes were made. transformer.…”

Section: A Comparison Of Experimental Values With Those Calculated Frommentioning

confidence: 99%

144. High vacuum distillation

1966

Vacuum

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Present knowledge in the field of molecular d is tilla tio n has ♦ not reached the point where it can be applied to designing commercial s t i l l s without extensive bench and p ilo t scale development. Analysis of the lite ra tu re indicates that additional experimental data and improved methods of applying the fundamental laws of transport phenomena to this problem are needed. This research was conducted, therefore,

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Section: A Comparison Of Experimental Values With Those Calculated Frommentioning

confidence: 99%

144. High vacuum distillation

1966

Vacuum

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“…Impingement atomization of liquid jet streams have been extensively studied. Dixon et al investigated the liquid film formed by means of rotating disks and measured the velocity and thickness of the film. Ashgriz et al noted that the mean drop diameter increases with an increase in the impingement surface to jet diameter ratio.…”

Section: Introductionmentioning

confidence: 99%

VOF Method for Impinging-Jet Atomizers

Cong¹,

Liu²,

Zhen-yu³

et al. 2010

Energy Fuels

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Impinging jet atomization is an effective method to produce fine sprays for extremely high viscosity fuels such as coal water slurry (CWS). This technique has been used successfully in a number of CWS applications since its inception. The purpose of this study is to analyze the effect of liquid viscosity and jet velocity in an impinging jet atomizer with a combined volume of fluid (VOF) model. It is observed that the film thickness increases with increased liquid viscosity, and the (a) relative velocity between the liquid and gas phase, (b) the gas liquid ratio (GLR), and (c) the atomizing gas pressure all play important roles. Mean droplet size predicted with the VOF model agrees well with experiments.

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“…Because of their widespread application, impinging jet atomizers have been extensively investigated. Detailed theoretical studies of these atomizers were initiated by Hagerty and Shea [1] and Dixon et al [2]. Later, Dombrowski and coworkers [3][4][5][6], in a number of studies, presented analytical models of droplet formation in thinning liquid films.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Splash-Plate Atomizers Using Numerical Simulations

et al. 2007

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A computational model has been developed that can be used for the spray characterization of splash-plate atomizers. The computer model, called BLSpray, can accurately simulate the impingement of a liquid jet on the surface of a splashplate nozzle, as well as the formation of the liquid film and subsequent droplets. To validate the model, simulation results were compared to experimental measurements for the film thickness and velocity distributions in a typical splash-plate nozzle. Close agreement between numerical results and measurements validated the model and its underlying assumptions. Correlations were developed between liquid film characteristics at the nozzle exit and the spray mean drop sizes. This was done by running many different numerical simulations on a typical splashplate nozzle using the developed computer code. The correlations were obtained by performing a close inspection of the numerical results in order to extract all information regarding the liquid film and spray. The results of the developed code were combined with the correlations to get the spray drop size distribution in a more practical approach, with less computational time and effort. This capability, along with the program module developed for analyzing the output data, has turned the developed code into an efficient and practical tool in the design and characterization of splash-plate nozzles. The developed computer model can be used to predict the behavior of a flow into a nozzle at different operating conditions, and also as a tool in the design of new nozzles. This paper presents mathematical formulations, results of model validation, and the spray drop size distribution for a typical ALSTOM splash-plate nozzle. Also, the effect of some of the main parameters on the spray pattern, such as nozzle diameter, nozzle angle, and nozzle velocity, are investigated.

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Liquid films formed by means of rotating disks

Cited by 3 publications

References 0 publications

144. High vacuum distillation

144. High vacuum distillation

VOF Method for Impinging-Jet Atomizers

Characterization of Splash-Plate Atomizers Using Numerical Simulations

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