Contents lists available at Mapta Publishing Group Mapta Journal of Mechanical and Industrial Engineering (MJMIE) journal homepage: http://maptapublishing.com/index.php/mjmie Vol. 5, No. 2, December, 2021 ISSN: 2517-4258 23 Comparing the Influence of Synthetic jets on Cooling the Angled Plates Versus Vertical and Horizontal Plates Miralireza Nabavi a,* , Moharram Jafari b a School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, USA b Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran Article Info Abstract Article history: Received Jun 24 th , 2021 Revised Aug 8 th , 2021 Accepted Aug 28 th , 2021 Synthetic jets besides being used in heat transfer, have also been used to control turbulence and flow separation. In the previous decade, research on the applications of a synthetic jet has indicated that by using these types of jets, flow separation can be reduced or even stopped altogether. In addition, these jets have been utilized in unmanned aerial vehicles (UAVs) (to control separation on airfoils) and flight control. In this study, the jet is located perpendicular to the flat plane with fixed heat flux and the effect of some geometric parameters including the ratio of the distance between the jet and the impact plane to the nozzle width, the ratio of the impact plane length to the jet nozzle width, the ratio of synthetic jet width to width of the nozzle, the ratio of the hole height to the nozzle width, the angle of the impact plate as well as the diaphragm characteristics such as amplitude and frequency of the jet diaphragm in heat transfer were evaluated numerically by using OpenFOAM open-source software. The findings indicate that synthetic jets have very weak efficiency for cooling vertical panels. However, they are extremely effective on angled plates. Synthetic jets have more influence on angled planes than horizontal planes. Keyword: Synthetic jet Heat transfer Impinging jet Numerical simulation 1. Introduction Synthetic jets in addition to their usage in heat transfer, have also been used to control turbulence and current separation. In the previous decade, studies on the applications of synthetic jets have shown that by using these types of jets, current separation can be reduced or even stopped altogether. In addition, the use of these jets has been noticed in unmanned aerial vehicles (UAVs) (to control separation on airfoils) and flight control [1]. Zero-Net Mass-Flux (ZNMF) actuators also have applications in propulsion. The jet used by mermaids, squid and octopus, and others is conceptually very similar to the used mechanism to create synthetic jets. These animals consecutively, by swallowing and expelling water jets, make a pure stream. Similar to synthetic jet applicants (SJAs), which add both energy and momentum to the stream despite zero net mass flux to energize the boundary layer current in air-shaped devices and flow control applications. Jet flow is a type of fluid flow in which through a nozzle a fluid is injected into the ambient fluid [2]. Synthetic jets, as explained in the introduction, have a chamber, a piston or vibrating membrane, and one or more nozzles. One of the fluid characteristics of these jets is the production of vortex rings at the nozzle or orifice output. During the blowing phase, the outlet fluid separates at the edge of the nozzle to form a vortex pair or vortex ring. In the suction stage, the fluid is pulled from the environment into the chamber, but the eddy rings are far enough away from the nozzle and are not relatively influenced. Then new vortex ring is produced, and thus the cycle continues with the production of a chain of vortex rings. In the fast-growing electronics industry, effective cooling systems are necessary. However, one of the major challenges for engineers is the effective use of air to transfer heat in a confined space to electronic equipment. Considering the high-end processing and downsizing of electronic equipment, proper cooling of the components is * Corresponding author: anabavib@asu.edu  This is an open access article under the CC-BY license (https://creativecommons.org/licenses/by/4.0/). © Authors retain all copyrights.