Effects of Arrangement and Phase Difference of Oscillation of Synthetic Jets on Heat Transfer in Micro-channels

  • jahanfar khaleghinia Islamic Azad University
  • Farshad Kowsary University of Tehran
  • Cyrus Aghanajafi K. N. Toosi University of Technology
Keywords: Micro-channel, Synthetic jet, Numerical, Heat transfer

Abstract

In this study, effects of two different arrangements and π-radian phase difference in the oscillation of membranes of three synthetic jets, in a cross-flow of a micro-channel, on heat transfer and temperature distribution uniformity of a hot wall, located at certain distance from the synthetic jet outlet, were numerically studied by a three-dimensional model using dynamic mesh. Obtained results show that synthetic jets provide better cooling for the hot plate; however, the position and phase difference of the oscillation in the actuators of the synthetic jets are effective on the degree of cooling improvement. Depending on the position and operating conditions of the synthetic jets, reduction in the average temperature of the hot plate and increase in the Nusselt number vary from 21% to 28% and from 64% to 92% as compared to micro-channel without synthetic jet, respectively. In addition, operation of the synthetic jets improved temperature uniformity over the hot wall and improvement varies from 34% to 47% as compared to case of no synthetic jet in the micro-channel.

DOI: http://dx.doi.org/10.5755/j01.mech.23.1.14091

Author Biographies

jahanfar khaleghinia, Islamic Azad University
Department of Mechanical and Aerospace Engineering, Ph.D. Candidate
Farshad Kowsary, University of Tehran
Department of Mechanical Engineering, Professor
Cyrus Aghanajafi, K. N. Toosi University of Technology
Department of Mechanical Engineering, Professor
Published
2017-03-01
Section
MECHANICS OF FLUIDS AND GASES