Experimental Investigation of a Synthetic Jet Array in a Laminar Channel Flow

Abstract

Abstract. The paper deals with an impinging synthetic jet, namely on the case of a synthetic jet array interacting with a laminar channel flow. This arrangement can be useful in many micro-scale applications, such as cooling of micro-electronics. The flow regime in micro-scale is usually laminar with very small Reynolds numbers; therefore synthetic jet array can be used for the profile disturbance and heat transfer enhancement. The paper focuses on the low Reynolds number (in order 10 2 ). The working fluid is water and a piezoceramic transducer is used as a moving membrane in the synthetic jet actuator. Experiments are performed with four experimental methods (tin ion visualization, hot wire anemometry in constant temperature mode, laser Doppler vibrometry and particle image velocimetry) in three laboratories (at the Eindhoven University of Technology, Netherlands, at the Institute of Thermodynamics CAS, v.v.i. and Technical University of Liberec, both Czech Republic).

Experimental and numerical research of synthetic jet array

“…This paper describes the additional research of the synthetic jet array in a channel flow and continues the paper of authors Danþová, Trávníþek and Vít, [1]. Numerical simulations support the experiments from [1] and the influence of the new slope of the synthetic jet orifices is studied here.…”

“…Based on the experimental results from [1], the adjustment for the numerical simulation in sw Ansys Fluent was prepared and tested. This adjustment will be used for new experiments preparation with inclined orifices of the synthetic jet array.…”

Optimization of the heat output of wall convectors with using an unconventional slumped glass cover

“…A lot of international authors e.g. [6,7,8] deal with the question of an appropriate type of convection and they have been trying to find out a compromise between thermal comfort and the size of the supplied energy. The results showed that in energy terms is more advantageous to use the natural convection instead of the forced convection.…”

Measurement of a Temperature Field Generated by a Synthetic Jet Actuator using Digital Holographic Interferometry

“…Especially in micro-electronic coolers, the flow regime is usually laminar, with a very small Reynolds numbers (in the order of 10 2 ). Therefore, transfer processes such as mixing and cooling are typically based on gradient diffusion [17][18][19][20]. The heat transfer processes can be enhanced with the actuation of the laminar flow, creating a so-called "quasi-turbulent" flow character [19].…”

“…The heat transfer processes can be enhanced with the actuation of the laminar flow, creating a so-called "quasi-turbulent" flow character [19]. In these cases, a synthetic jet actuator [17][18][19][20][21] or other vortex generators [22][23][24] can be used effectively.…”