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

Abstract

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.

Numerical and Experimental Characterization of a Coanda-Type Industrial Air Amplifier

“…They have been proposed as alternatives in industrial environments to cool systems (i.e., data centers and battery packs) [12], distribute heat in molds, ventilate welding fumes, and suppress dust [12][13][14]. Air amplifiers are also used for air purification and humidification in confined areas [15] but have also been proposed to be employed in landfill aeration systems [16]. Their use in scientific research has been proven to be effective in improving the efficiency of mass spectrometers [17][18][19].…”

“…In terms of an analysis of their performance, several works that address the impact of the main geometrical parameters on the performance of air amplifiers can be found in the literature, most of them from a numerical approach. There is a consensus that the most critical parameters are the width of the injection gap, δ, and the total pressure of the injected air [1,11,[13][14][15]18,[20][21][22]. The higher the injected air pressure, the higher the primary and secondary flow rates.…”