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

Vedant Joshi, Wedyn Noronha, Vinayagamurthy G. (), Sivakumar R. and Rajasekarababu K. B.
Additional contact information
Vedant Joshi: School of Mechanical Engineering, Vellore Institute of Technology, Chennai 600127, India
Wedyn Noronha: School of Mechanical Engineering, Vellore Institute of Technology, Chennai 600127, India
Vinayagamurthy G.: Centre for Innovation and Product Development, School of Mechanical Engineering, Vellore Institute of Technology, Chennai 600127, India
Sivakumar R.: School of Mechanical Engineering, Vellore Institute of Technology, Chennai 600127, India
Rajasekarababu K. B.: School of Civil and Environmental Engineering, AIWE-Lab, Harbin Institute of Technology Shenzhen, Shenzhen 518055, China

Energies, 2023, vol. 16, issue 4, 1-17

Abstract: Bladeless fans are more energy efficient, safer due to the hidden blades, easier to clean, and more adjustable than conventional fans. 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 by using a k-omega SST turbulence model with an all y + wall treatment used to numerically simulate in CFD. The computational 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 (U), turbulent kinetic energy, the standard deviation of velocity, and outlet velocity magnitude are used to assess the performance of airfoil profiles used in bladeless fan.

Keywords: bladeless fan; outlet slit thickness; outlet slit angle; discharge ratio; coanda effect; Eppler 473; CFD (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/16/4/1633/pdf (application/pdf)
https://www.mdpi.com/1996-1073/16/4/1633/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:16:y:2023:i:4:p:1633-:d:1059909

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().