Investigation on Convergence _ Divergence Nozzle Shape for Microscale Channel in Harvesting Kinetic Energy

Malaysian Technical Universities Conference on Engineering and Technology 2017

Zakaria, M.S.^1 ; Zairi, S.^1 ; Misbah, M.N.^1 ; Saifizi, M.^1 ; Rakawi, Izzudin^1

Faculty of Engineering Technology, Universiti Malaysia Perlis, Level 1, UniCITI Alam Campus, Sungai Chuchuh, Padang Besar, Perlis

02100, Malaysia^1

关键词: Channel inlets;    Diameter ratio;    Flow charac-teristics;    Fluid velocities;    Microscale channel;    Nozzle diameter;    Nozzle shape;    Performance evaluations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/318/1/012056/pdf
DOI  :  10.1088/1757-899X/318/1/012056

来源: IOP

【 摘 要 】

This paper presents performance evaluation of nozzle shapes on microscale channel by employing different types of NACA airfoils profile and conventional profile. The deploying nozzle used are NACA 0012, NACA 0021 and NACA 0024 airfoils while for conventional convergence-divergence nozzle diameter ratio (d2/ d1) in the range from 1/4 to 3/4 are applied. These nozzles are assembled on rectangular cross sectional microscale channel which has designated constant fluid flow velocity at the channel inlet. This study revealed reduction on diameter ratio increased dramatically fluid velocity but further reduction on diameter ratio exposed fluid flow to fluctuate which slightly slowing down the fluid velocity. Nevertheless, curved NACA profiles are favourable for convergence - divergence nozzle in microscale channel as it significantly improved flow characteristics by enhancing fluid velocity and resultant kinetic energy as compared to conventional profile.