Abstract
This paper shows the possibility of the measurement of a temperature field generated by heated fluid from a synthetic jet (SJ) actuator. Digital holographic interferometry (DHI) was the main measuring method used for the experiments. A single-projection DHI was used for the visualization of the temperature field as an average temperature along the optical axis. The DHI results are compared with data obtained from constant current anemometry (CCA) experiments for the validation of the method. Principle of 3D temperature distribution using a tomographic approach is also described in this paper. A single SJ actuator, multiple continual nozzle, and the SJ actuator with two output orifices are used as a testing device for the presented experiments. The experimental configuration can measure high-frequency synthetic jets with the use of a single slow-frame-rate camera. Due to the periodic character of the SJ flow, synchronization between the digital camera, and the external trigger driving the phenomenon is performed. This approach can also distinguish between periodic and random parts of the flow.
Highlights
Heat transfer measurement is a complex discipline that is extended into many scientific and industrial sectors
Digital holographic interferometry (DHI) is a non-contact, non-invasive, and highly accurate experimental method for measuring quantities that affect the phases of a light wave passing through or reflected from the measured object
Of the vortexes exhausted from the synthetic jet (SJ) actuator orifice in every cycle, it is possible to synchronize the advantage of synchronization improvement of phase the signal-to-noise ratio, and trigger Another of the individual frames on the camera isat the a particular chosen of the SJ period
Summary
Heat transfer measurement is a complex discipline that is extended into many scientific and industrial sectors. 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. For the SJ investigation, a lot of experimental can be used, and itthe cansensor be divided into inside the measured medium, and it affects not the measured results, and phenomenon two main groups—contact and non-contact. To prevent the affection measure temperature distributions can be the following: the Schlierenmethods method that [32], are absorption placed probe, the non-contact method is e.g., suitable for use. This approaches and their limits, as they are used for different types of actuators
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