scholarly journals Thermal, flow and acoustic characteristics of the heat sink integrated inside the synthetic jet actuator cavity

2021 ◽  
Vol 170 ◽  
pp. 107171
Author(s):  
Paweł Gil ◽  
Emil Smyk ◽  
Rafał Gałek ◽  
Łukasz Przeszłowski
Keyword(s):  
Heat Sink ◽  
Synthetic Jet ◽  
Thermal Flow ◽  
Acoustic Characteristics ◽  
Synthetic Jet Actuator

scholarly journals Performance of special type heat sink with an integrated synthetic jet actuator

2019 ◽  
Vol 100 ◽  
pp. 00017 ◽  
Author(s):  
Paweł Gil
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Thermal Power ◽  
High Heat ◽  
Synthetic Jet ◽  
Industrial Environment ◽  
Synthetic Jet Actuator ◽  
Characteristic Temperatures ◽  
High Heat Transfer ◽  
High Heat Transfer Coefficient

The performance of special type heat sink with integrated synthetic jet actuator has been presented in this work. Synthetic jet is a flow technique which synthesizes stagnant air to a form of jet. Synthetic jet produces high turbulent flow and thus high heat transfer coefficient can be achieved. Standard heat sink with fan have limited applications in particular in a dusty industrial environment. Therefore, the use of new flow technique is optimistic. The paper presents preliminary results of heat sink thermal power and characteristic temperatures during synthetic jet switched on and off. The results show that under synthetic jet switched on, the dissipated heat is 3.7 times higher than when synthetic jet is switched off.

Experimental Study on the Effect of Synthetic Jets on Flow Boiling Heat Transfer in Microchannels

2012 ◽  
Author(s):  
Ruixian Fang ◽  
Jamil Khan
Keyword(s):  
Heat Sink ◽  
Flow Boiling ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Driving Voltage ◽  
Micro Channel ◽  
Two Phase ◽  
Synthetic Jet Actuator ◽  
Micro Channels ◽  
Boiling Flow

Two-phase flow instabilities in micro-channel exhibit pressure and temperature fluctuations with different frequencies and amplitudes. An active way to suppress the dynamic instabilities in the boiling micro-channels is to introduce synthetic jets into the channel fluid. Thus the bubbles can be condensed before they clog the channel and expand upstream causing flow reversal. The present work experimentally investigated the effect of synthetic jets on the suppression of flow boiling instabilities exhibited in a micro-channel heat sink. The heat sink is consisted of five parallel rectangular microchannels measured 500 μm wide, 500 μm deep each. An array of synthetic jets was placed right above the micro-channels with each channel corresponds to 8 jet orifices. The strength and frequency of the jets are controlled by changing the driving voltage and frequency of the piezoelectric driven synthetic jet actuator. Tests were performed with synthetic jets operating at 80 Hz and 150 Hz respectively. It is found that the bubbles were effectively condensed inside the jet cavity. The boiling flow reversals were notably delayed by the synthetic jets. Meanwhile, the pressure fluctuation amplitudes were substantially reduced. Test results were analyzed and discussed in detail.

An Active Radial Countercurrent Heat Sink Driven by a Synthetic Jet Actuator

2001 ◽  
Author(s):  
Jelena Vukasinovic ◽  
Ari Glezer
Keyword(s):  
Heat Transfer ◽  
Heat Sink ◽  
Jet Impingement ◽  
Ambient Air ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Heat Transfer Analysis ◽  
Orifice Diameter ◽  
Synthetic Jet Actuator ◽  
Extended Surface

Abstract The performance of a low-profile radial countercurrent heat sink driven by an integrated synthetic jet actuator is investigated experimentally. A packaged thermal test die is cooled using an array of synthetic jets normally impinging on the extended surface. A power dissipation of 50 W is accomplished at the nominal case temperature of Tc = 70 °C. The heat sink design is driven by the flow and heat transfer analysis of normal jet impingement in a confined flow geometry consisting of two parallel circular plates having a diameter that is typically an order of magnitude larger than the spacing between the plates. The velocity and temperature distributions are measured using particle image velocimetry and arrays of thermocouple sensors. A jet actuator is integrated into one of the plates and cools a test heater attached to the opposite surface. The jet draws its makeup air from ambient, impinges on the heater, and ultimately rejects the heat to ambient. This introduces a radial countercurrent flow in the gap between the plates that includes a layer of hot air dispensed along the top plate and a layer of cooler ambient air entrained along the jet exit plane. When the jet is activated the heater temperature drops substantially. Although the global heat transfer coefficient decreases with decreasing gap height, flow pathlines show that the jet can still entrain cool air from ambient and effect substantial cooling even when the spacing between the plates is of the order of the jet orifice diameter.

Experimental Heat Transfer Enhancement for Single Phase Liquid Micro-Channel Cooling Using a Micro-Synthetic Jet Actuator

2009 ◽  
Author(s):  
Ruixian Fang ◽  
Wei Jiang ◽  
Jamil Khan ◽  
Roger Dougal
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Heat Sink ◽  
Thermal Effects ◽  
Single Phase ◽  
Heat Transfer Performance ◽  
Synthetic Jet ◽  
Driving Voltage ◽  
Transfer Performance ◽  
Synthetic Jet Actuator

The present work experimentally investigates the thermal effects of a synthetic jet actuator on the heat transfer performance of single-phase flow confined in a microchannel heat sink. The heat sink consisted of a single rectangular microchannel 500 μm wide, 300 μm deep and 26 mm long. Deionized water was employed as the cooling fluid. A synthetic jet actuator with a 100 μm diameter orifice was placed right above the microchannel and 5 mm downstream from the channel inlet. A Unimorph piezoelectric disc bender was employed as the synthetic jet actuator. The effects of the bulk microchannel flow Reynolds number, the synthetic jet operating voltage and frequency on the microchannel heat transfer performance are being investigated. The Reynolds number ranges from 100 to 500. The actuator driving voltage and frequency ranges in 20–180Vp-p and 10–150 Hz respectively. The results from the case without synthetic jet are compared to those with synthetic jet. It shows that the thermal effects of the synthetic jet are functions of the jet driving voltage, frequency, as well as the bulk mass flow rate in the microchannel. For the case of Reynolds number equal 177, around 24% enhancement is achieved under specified jet operating conditions for a single synthetic jet.

scholarly journals Cephalopod‐Inspired Swimming Robot Using Dielectric Elastomer Synthetic Jet Actuator

2020 ◽  
Vol 22 (4) ◽  
pp. 2070014
Author(s):  
Chao Tang ◽  
Wentao Ma ◽  
Bo Li ◽  
Mingliang Jin ◽  
Hualing Chen
Keyword(s):  
Dielectric Elastomer ◽  
Synthetic Jet ◽  
Synthetic Jet Actuator

Analytical Model: Characteristics of Nanosecond Pulsed Plasma Synthetic Jet Actuator in Multiple-Pulsed Mode

2017 ◽  
Vol 9 (2) ◽  
pp. 439-462 ◽  
Author(s):  
Zheng Li ◽  
Zhiwei Shi ◽  
Hai Du
Keyword(s):  
Flow Characteristics ◽  
Simulation Method ◽  
Synthetic Jet ◽  
Blast Waves ◽  
Pulsed Plasma ◽  
Synthetic Jet Actuator ◽  
Field Coupling ◽  
Neutral Gas ◽  
Pulsed Mode ◽  
Physical Principles

AbstractMulti-field coupling simulation method based on the physical principles is used to simulate the discharge characteristics of nanosecond pulsed plasma synthetic jet actuator. Considering the effect of the energy transferring for air, the flow characteristics of nanosecond pulsed plasma synthetic jet actuator are simulated. The elastic heating sources and ion joule heating sources are the two main sources of energy. Through the collisions, the energy of ions is transferred to the neutral gas quickly. The flow characteristics of a series of blast waves and the synthetic jet which erupt from the plasma synthetic jet (PSJ) actuator are simulated. The blast wave not only promotes outward, but also accelerates the gas mixing the inhaled gas from the outside cavity with the residual gas inside the cavity. The performances of PSJ actuator fluctuate in the first three incentive cycles and become stable after that.

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