Modelling of Axial Fans for Electronic Equipment

Hennissen, J; Temmerman, W. M.; Berghmans, Jan; Allaert, K.

doi:10.1007/978-94-011-5506-9_30

Cited by 11 publications

(3 citation statements)

References 1 publication

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“…However, it is practically impossible to also include the relatively high turbulence created by the fan. Various studies show that the direction of the flow is reasonably modeled, although recent studies show that a problem arises when the fan has to deliver some pressure (Hennissen et al, [16], Baelmans et al, [5], Grimes et al, [15]). Another point worth mentioning is the limitation of vendor-supplied fan curve characterization data, the implication being that predicted fan flow rates could be higher than what the fan could actually deliver.…”

Section: ) Fansmentioning

confidence: 99%

The conceivable accuracy of experimental and numerical thermal analyses of electronic systems

Lasance

2002

IEEE Trans. Comp. Packag. Technol.

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In the past decade, we have observed a significant worldwide increase in the use of computational codes to calculate the thermal behavior of electronic systems. The benefits of these 'virtual prototyping tools' are undisputed when it comes to performing parametric studies in early design phases. However, when the objective of the calculation is accuracy, as required for subsequent reliability and performance assessments, the discussion about the level of accuracy that we can expect in practice becomes far from trivial, as will be shown in this paper.A natural question is how accurate numerical simulations are when compared to well-designed experiments in prototypes or final products. Many studies demonstrate amazing agreement, the conclusion often being that 'validation of the numerical model' has been proven. It will be demonstrated that these conclusions are subject to serious doubts. This paper discusses 'every' topic associated with a comparison between numerical and experimental results that is based on first principles, not on fitting parameters until the two results match. The final conclusion is inevitable: the situation when all computations at the system level can be used for accurate temperature prediction is still a long way off. There are two reasons for this. The first reason is the lack of sufficiently accurate input parameters and boundary conditions. The second reason is the fact that several complex physical phenomena that rule the heat transfer behavior of electronic systems concur with complex geometries. From a practical point of view, a detailed analysis of reality cannot and will not be performed for a long time to come. Several suggestions of how to solve these problems are presented.Note: it should be stressed that the focus of the discussion related to computational fluid dynamics (CFD) is on an engineering approach, rather than a scientific approach.

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Section: ) Fansmentioning

confidence: 99%

The conceivable accuracy of experimental and numerical thermal analyses of electronic systems

Lasance

2002

IEEE Trans. Comp. Packag. Technol.

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“…Equation (1) shows that the static pressure efficiency takes both static pressure and fan power into consideration which makes it the most important aerodynamic performance index. Furthermore, the static pressure efficiency is usually the objective of structure optimization [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Effect of the Outer Ring of Annular Cooling Fan on the Aerodynamic Performance

Shu¹,

Yin²,

Shangguan³

et al. 2019

Preprint

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We studied the effect of the structure parameters of engine annular cooling fan with outer ring on the aerodynamic performance by means of experiments and model simulation in fluent®. Firstly, based on the experiment, a computational model is developed to calculate and analyze the aerodynamic performance of the tested annular fan. The model is validated by comparing the test results with the calculated data. Besides, the aerodynamic performance differences between two types of fans (common fan without outer ring and annular fan with outer ring) are discussed. Based on the computational model, the relation between aerodynamic performance and the outer ring structure parameters are investigated. The results show that the relative parameter on the axial direction has great influence on the aerodynamic performance; while the effect of radial relative parameter is minor. In addition, the outer ring with arc chamfer structure in the downstream side can improve its static pressure efficiency effectively.

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“…Twisted blade [2] is an effective design approach to improve the aerodynamic performance of the microfan, which is maturely studied for fans with large or middle scale. Investigations are made on the aerodynamic performance for the microfan by experimental and numerical approaches [3][4][5][6], which indicates that the traditional twisted blade design approach is not always suitable for the microfan. But so far, the detailed design approach for micro fan's twisted blade has not been fully concerned yet [1].…”

Section: Introductionmentioning

confidence: 99%

Investigations on Twisted Blade for Axial Microfan

Wang

2010

AMM

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By ‘Radial Equilibrium’ principle, an equation was derived to describe the radial distribution of the throughflow velocity, by which a design approach was proposed for the twisted blade of axial microfan. This approach can take into consideration the influence of the radial gradient for the throughflow velocity at the impeller’s outlet, which is different from the traditional design approach for large fans assuming the throughflow velocity remains radially unchangeable. By this design approach, attempt was made on the design for an axial microfan by choosing different twisted powers so as to obtain different shapes of twisted blades and their respective aerodynamic performance was numerically investigated. Compared to the corresponding straight blade and the twisted blade designed by the traditional approach, this new twisted blade can not only enlarge the stable operating range but also improve the flow pressure, which contributes to the improvement of the blade’s aerodynamic performance.

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Modelling of Axial Fans for Electronic Equipment

Cited by 11 publications

References 1 publication

The conceivable accuracy of experimental and numerical thermal analyses of electronic systems

The conceivable accuracy of experimental and numerical thermal analyses of electronic systems

A Study on the Effect of the Outer Ring of Annular Cooling Fan on the Aerodynamic Performance

Investigations on Twisted Blade for Axial Microfan

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