Numerical investigation of geometric parameter effects on the aerodynamic performance of a Bladeless fan

Jafari, Mohammad; Afshin, Hossein; Farhanieh, Bijan; Sojoudi, Atta

doi:10.1016/j.aej.2015.11.001

Cited by 20 publications

(6 citation statements)

References 12 publications

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“…For both models, given the high complexity, CAD-based software has been used to extrapolate the correct measurements. Therefore, several papers have been analyzed for the Bladeless fan [29], [30]: for both geometry [31]- [33] and simulation conditions the geometry a tutorial by the engineering company BW Engineering has been chosen [34].…”

Section: Experimental Characterizationmentioning

confidence: 99%

Numerical Simulation of Innovative Air Capture Systems Based on Bladeless Technology with Coandă effect

Carlini¹,

Mennuni²,

Rotondo³

et al. 2022

JFFHMT

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This work focuses on the feasibility study of a new suction hood model that allows the complete disposal of the fumes produced during cooking. The originality of this study lies in the conception of a new functional geometry meant to reduce consumption, focusing on the increase of both efficiency and aspiration efficiency. The new technology is based on the Coandă effect applied on two innovative air capture systems of hood model. On one hand the air flow amplifier, a system that, starting from a low inlet flow rate, allows 10 times increasing of the output flow rate. On the other hand, the bladeless fan, which is usually implemented in newest bladeless ventilation systems. A simulation campaign has been conducted with COMSOL Multiphysics software to validate the simulation scenarios comparing the experimental results with respective references. For the post-validation step, the parametric sweep function has been used to study the system behaviours to every change of velocity, flow rate and extension of the ejector. The obtained results show the feasibility of these new suction systems, which present lower consumptions than other modern ventilation systems for kitchens. The computed results show that the perimeter velocity is in accordance with European standards. The perimeter velocity for air flow amplifier geometry allows a suction capacity range between 460 m 3 /h and 3600 m 3 /h. In the bladeless fan case, the suction capacity is in a range between 325 m 3 /h and 2500 m 3 /h. Therefore, the two geometries can be installed for both domestic and commercial kitchens.

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Section: Experimental Characterizationmentioning

confidence: 99%

Numerical Simulation of Innovative Air Capture Systems Based on Bladeless Technology with Coandă effect

Carlini¹,

Mennuni²,

Rotondo³

et al. 2022

JFFHMT

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“…The bladeless fan output is uniform and has the maximum velocity at the centre of its velocity profile, optimal for cooling purposes. [2,4] investigated noise levels of a Bladeless fan in steady and unsteady flow conditions, using Broadband Noise Source (BNS) and Ffowcs Williams and Hawkings (FW-H) equations. The numerical investigation indicated that the outlet slit of air is the primary noise source.…”

Section: Literature Surveymentioning

confidence: 99%

Determination of Optimum Outlet Slit Thickness and Outlet Angle for the Bladeless Fan Using CFD

Joshi¹,

Noronha²,

Vinayagamurthy³

et al. 2022

Preprint

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Toshiba devised the bladeless fan (or Air Multiplier) concept in 1981. Researchers like James Dyson and Jafari et al. further developed it. Bladeless fans are more energy-efficient, safer due to the hidden blades, easier to clean, and more adjustable than conventional fans. From a performance point of view, bladeless fans are better because they multiply mass flow rate, eliminate buffeting, consume less power, and are quieter. This paper investigates the influence of the airfoil’s outlet slit thickness on the discharge ratio by varying the outlet slit thickness of an Eppler 473 airfoil from 1.2 mm to 2 mm in intervals of 0.2 mm. Results indicated that smaller slits showed higher discharge ratios. The airfoil with a 1.2 mm slit thickness showed a discharge ratio of 18.78, a 24% increase from the discharge ratio of the 2 mm slit. The effect of outlet angle on the pressure drop across the airfoil was also studied. Outlet angles were varied from 16∘ to 26∘ by an interval of 2∘. The airfoil profile with a 24∘ outlet angle showed a maximum pressure difference of 965 Pa between the slit and leading edge. In contrast, the 16∘ outlet angle showed the least pressure difference of 355 Pa. Parameters such as average velocity, turbulent kinetic energy, the standard deviation of velocity and outlet velocity magnitude was used to assess the performance of airfoil profiles used in bladeless fan.

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“…For a better understanding of the airflow, in figure 2 we show the qualitative distribution of streamlines of the airflow around the mouth and the bag's opening. This effect can help the teacher to explain the operation of the socalled bladeless air multiplier fan [29].…”

Section: Experimental Demonstration Of the Venturi Effect And Its App...mentioning

confidence: 99%

An approach to the Venturi effect by historical instruments

et al. 2021

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Student understanding of the laws that describe the flow of a fluid is often hampered by a defective knowledge of basic classical mechanics (kinematics, statics, dynamics, and conservation laws) and by wrong common-sense ideas about quantities related to fluids, such as velocity and pressure. A pedagogical discussion about the Venturi effect, based on experiments inspired by historical instruments, may be an effective way to introduce students to these laws. In this paper, we discuss an approach to the understanding of the Venturi effect based on the study of historical instruments and on simple experiments. In particular, after a presentation of the Venturi effect, also from a historical point of view, we illustrate some interesting applications, the Venturi meter, the Bunsen burner, the Venturi vacuum pump, and propose some simple experiments.

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Numerical investigation of geometric parameter effects on the aerodynamic performance of a Bladeless fan

Cited by 20 publications

References 12 publications

Numerical Simulation of Innovative Air Capture Systems Based on Bladeless Technology with Coandă effect

Numerical Simulation of Innovative Air Capture Systems Based on Bladeless Technology with Coandă effect

Determination of Optimum Outlet Slit Thickness and Outlet Angle for the Bladeless Fan Using CFD

An approach to the Venturi effect by historical instruments

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