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Applications
Published in Raj P. Chhabra, CRC Handbook of Thermal Engineering Second Edition, 2017
Joshua D. Ramsey, Ken Bell, Ramesh K. Shah, Bengt Sundén, Zan Wu, Clement Kleinstreuer, Zelin Xu, D. Ian Wilson, Graham T. Polley, John A. Pearce, Kenneth R. Diller, Jonathan W. Valvano, David W. Yarbrough, Moncef Krarti, John Zhai, Jan Kośny, Christian K. Bach, Ian H. Bell, Craig R. Bradshaw, Eckhard A. Groll, Abhinav Krishna, Orkan Kurtulus, Margaret M. Mathison, Bryce Shaffer, Bin Yang, Xinye Zhang, Davide Ziviani, Robert F. Boehm, Anthony F. Mills, Santanu Bandyopadhyay, Shankar Narasimhan, Donald L. Fenton, Raj M. Manglik, Sameer Khandekar, Mario F. Trujillo, Rolf D. Reitz, Milind A. Jog, Prabhat Kumar, K.P. Sandeep, Sanjiv Sinha, Krishna Valavala, Jun Ma, Pradeep Lall, Harold R. Jacobs, Mangesh Chaudhari, Amit Agrawal, Robert J. Moffat, Tadhg O’Donovan, Jungho Kim, S.A. Sherif, Alan T. McDonald, Arturo Pacheco-Vega, Gerardo Diaz, Mihir Sen, K.T. Yang, Martine Rueff, Evelyne Mauret, Pawel Wawrzyniak, Ireneusz Zbicinski, Mariia Sobulska, P.S. Ghoshdastidar, Naveen Tiwari, Rajappa Tadepalli, Raj Ganesh S. Pala, Desh Bandhu Singh, G. N. Tiwari
The synthetic jet is formed in a stagnation fluid due to vibration of a diaphragm in a closed cavity having one or more openings at some other end of the cavity. Owing to the oscillatory nature of the flow, calculation of Reynolds number is not straightforward. The Reynolds number of the synthetic jet is calculated as (Smith and Glezer, 1998):
Experimental and numerical investigation of the thermal performance of impinging synthetic jets with different waveforms
Published in Experimental Heat Transfer, 2023
Pushpanjay K. Singh, Santosh K. Sahu, Prabhat K. Upadhyay, Shashwat Singh
Miniaturization of electronics led to high power density, and higher thermal stress resulted in the failure of electronic components. This necessitates the advancement of efficient cooling techniques for the thermal control of electronic appliances. The conventional methods of heat transfer enhancement techniques such as the protruded surfaces, heat sink, and fans may be adequate to remove heat in the case of electronic components [1]. Among other systems, synthetic jet (SJ) can be employed as an alternative cooling technique for the thermal control of electronic appliances [2, 3]. The SJ utilizes lower input power, does not require any complex ducting, and confined reservoirs to transport fresh air to the heated surface [2–4]. Synthetic jet is formed by a vibrating membrane inside a cavity, which generates a periodic variation in volume, subsequently, periodic change in pressure. The SJ, during its one cycle of operation, consists of two strokes, such as suction and expulsion stroke. During the suction phase, the ambient air is sucked inside the actuator cavity, and during the expulsion phase, the fluid gets compressed inside the actuator cavity and subsequently expelled through the small opening (orifice), and vortex rings are formed at the edge of the orifice. These vortex rings propagate away from the orifice because of their self-induced velocity, resulting in the time-averaged jet formation near the jet axis [5, 6].
Synthetic and Continuous Jets Impinging on a Circular Cylinder
Published in Heat Transfer Engineering, 2019
Zuzana Broučková, Zdeněk Trávníček, Tomáš Vít
All the IJ studies described above used continuous, steady-flow fluid jets (CJs). Another alternative is a utilization of pulsating jets. The synthetic jet (SJ) is a type of pulsating jets and is, namely, a fluid flow motion that is created during an oscillatory process of a fluid exchange between a cavity and its surroundings, as explained by Smith and Glezer [11]. The first SJ actuator, as we think of it today, was most likely a laboratory air-jet generator designed and used by Dauphinee in 1957 [12]. Since the end of the last century, this phenomenon has been the subject of intensive investigations typically referred to as an SJ [11], [13], [14], a zero-net-mass-flux jet [15, 16], or an oscillatory vorticity generator [16]. Note that SJ can exist only if fluid oscillations overcome a formation criteria threshold, i.e., the discharge stroke of the SJ has to be strong enough to produce SJ with a time-averaged velocity component, as observed in [17]–[21].
Experimental and Numerical Investigation of the Effect of Bypass Injection on Wall Temperature Distribution of a Single-Phase Mini/Micro-Channel
Published in Heat Transfer Engineering, 2021
Raamkumar Loganathan, Ahmed Mohiuddin, Sateesh Gedupudi
Studies by Timchenko et al. [31], Chandratilleke et al. [32], Fang et al. [33] and Lee et al. [34], evaluated the effects of synthetic jets on micro-channel flows. Synthetic jet is a pulsating fluid jet formed from intake and ejection of fluid through an orifice into a space filled with fluid. Synthetic jets created local turbulence which helped in enhancing the heat transfer, reducing the maximum temperature of the micro-channels and removing the hot regions.