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2013-05-08 08:51:40
Untag Telah Luluskan 35.000 Sarjana
2013-05-08 08:51:25
FKIP Untirta Gelar Gebyar Hardiknas 2013
2013-05-08 08:50:53
Hasil penelitian wajib disertai sosialisasi

Publikasi Penelitian Dosen


A greater heat load due to the miniaturization of electronic products causes the need for a new
cooling system that works more efficiently and has a high thermal capacity. A synthetic jet is
potentially useful for the cooling of electronic components. This paper reports the results of our
experimental studies and the influence of orifice shape for Impinging Synthetic Jet cooling
perfomance. The effect of shape of the orifice of an impinging synthetic jet assembly on the
apparatus cooling of a heated surface is experimentally investigated. It will be seen that the
characteristics of convective heat transfer will occur by moving the piezoelectric membrane.
The prototype of the synthetic jet actuator is coupled with two piezoelectric membranes that
operate by 5 volt electrical current and create a sinusoidal wave. The orifice shapes considered
are square and circular. The results show the significant influence of orifice shape and
sinusoidal wave frequencies on the heat transfer rate that were obtained. The temperature drop
with a square orifice is found to be larger than that with circular shapes. A square orifice has a
larger covered area if compared to the circular orifice at the same radius, thus resulting in a
larger entrainment rate that leads to an increase of heat transfer performance.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 87 x


Synthetic jet which is based on zero netto mass input but non-zero momentum is a new approach
utilized for cooling system. The synthetic air jet was generated by vibrating membranes which pushed out the air from the cavity through the exit nozzles with oscillatory motion. This research investigated the forced cooling characterization of a cross flow synthetic jet using double membrane actuator with two different variations of sinusoidal and square wave and was conducted in computational as well as experimental stage. Computational stage was conducted by a commercial CFD software of Fluent® with a turbulence model k- ω SST with meshing elements quad type pave, while in the experimental work the function generators was used to drive the membranes with the variation of sinusoidal and square wave in three oscillation frequencies i.e 80 Hz, 120 Hz, and 160 Hz at fixed amplitude of 0.002 m/s. The experimental results show significant effect of the reduction of the confinement effect phenomena by using the cross flow synthetic jet. The best heat transfer rate, hence the optimum cooling effect was obtained at a lower oscillation frequency; in this study at sinusoidal 120 Hz – sinusoidal 120 Hz.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 39 x

Effect of Impinging Distance for Convective Heat Transfer of Synthetic Jet

Numerical simulations and experimental methods are conducted to discover the effect of various
distance between the orifice and the heated plated (L). The investigation focusing on the characteristics of convective heat transfer by a synthetic jet circular orifice. The results is verified by the time history of convective heat transfer characteristic and validated against existing experimental results. The model was simulated to investigate the dispersion of heat flow on the walls using a mathematical turbulent model of k-w SST. The Reynolds number (Re) is in the range of 1421-2843 based on average velocity, while the normalized impinging distance varies between 0 and 3.3. The movement of the piezoelectric membrane is assumed of sinusoidal wave function. The results showed the significant influence of L/d Ratio and sinusoidal wave frequencies to the heat transfer rate obtained. At small axial distance (L), average Nusselts number decrease due to confinement effect. However, at larger axial distances, the synthetic jet velocity weaken which again reduces the convective heat transfer coefficient.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 33 x

Effect of Cavity Design of Synthetic Jet Actuator to the Heat Transfer Characteristic of an Impinging Flow Configuration

A Synthetic jet works based on a vibrating membrane inside a cavity and nozzle for the air outlet. The synthetic jet cavity interior has an important role to generate the air at sufficient conditions to do the cooling process. This research investigated the flow and convective heat transfer characteristics on four impinging synthetic jet prototype with different excitation modes of a sinusoidal waveform forcing. The main purpose of this synthetic jet was to create vortices pair to come out from nozzle which will accelerate the heat transfer process occurring at the impinged wall. This heat transfer enhancement principles became the basis to simulate an alternative cooling system to substitute the conventional fan cooling in electronic devices due to its advantage for having a small form factor and low noise. The investigation combined computational and experimental works. In the experiment sinusoidal waveform was used to oscillate the membrane and the wave frequency used were 80 Hz, 120 Hz, 160 Hz and the velocity amplitude was 1 m/s. Some results indicated significant influence of the cavity design, frequency excitation, and waveform to the rate of heat transfer obtained.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 34 x

Pengaruh Model Turbulensi Pada Analisis Komputasi Sintetik Jet Untuk Sistem Pendingin Komponen Mikroelektronik

This research examines the influence of turbulence model k-epsilon standar, k-epsilon realizable, k-omega standar dan k-omega SST (Shear Stress Transport) to determine the convective heat transfer for an impinging synthetic jet model. The prototype of synthetic jet has 20 outlet nozzle with a diameter size of each nozzle of 2 mm and is driven by two piezoelectric membrane that operate by 5 volts and create a sinusoidal wave. In this research the investigation was carried out by computational methods using the software CFD (Computational Fluid Dynamics) to resolve the turbulence models as well as experimental methods to validate the turbulence model by measuring the temperature for 3 minutes. Oscillation frequency of the piezoelectric membrane that drives the synthetic jet was set as 120 Hz with the amplitude 2 mm/s. The results shows that K-Omega turbulence model SST is better to simulate the synthetic jet stream that has a narrow slit as a flow passage

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 33 x

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