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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
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Publikasi Penelitian Dosen

EXPERIMENTAL AND COMPUTATIONAL STUDY ON THERMAL STRUCTURE OF A SEPARATED REATTACHEMENT FLOW UNDER HEATED GAS INJECTION
Abstrak

Flow channel with sudden expansion produces a separated flow so that causing a recirculation flow. This investigation is revealing the alteration of the thermal structure within the flow field due to a heated gas penetration. Main focus is placed on the influence of the ratio of specific momentum injection (I=0.1 and I=0.5), the injection location of heated gas (lf= 2H and lf=4H) and the variation of injection temperature (Ti=1000C and Ti=3000C) The investigation was done computationally using finite volume method as well as experimentally in a closed loop flow channel with a
backward-facing step flow configuration. Numerical solution models turbulence used were k-epsilon standard model and RNG k-epsilon. The numerical model was then validated by the experimental results. This model works on 2-D and 3-D Reynolds average Navier-Stokes (RANS) equations. From the results of thermal structure obtained, it can be suggested that increasing the the ratio of specific
momentum injection supports more effective thermal mixing except to the narrow region around area injection. More significant results are obtained in the region of shear layer and area downstream of the injection.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 27 x

CHARACTERISTICS OF CONVECTIVE MASS TRANSFER UNDER INFLUENCE OF TURBULENCE CONTROL WITH WALL-RECESS IN A PARALLEL PLATE ELECTROCHEMICAL FLOW CELL
Abstrak

This research investigated the characteristics of convective mass transfer in a parallel plate electrochemical flow cell under the influence of turbulence induced by a wall-recess that produce a separating-reattached flow field. Wall-recess was in the form of a 5 mm rearward-facing step ontoured-channel which was placed upstream of the electrochemical cell to serve as a control device for turbulence level. Experimental work was done to elucidate the effect of fluid dynamical parameters to the rate of mass transfer between cell electrodes made of copper plates. The experimental set-up consisted of closed loop flow channel equipped with flow rate control and solution of CuSO4 of 0.5M was used as electrolyte fluid. The measurement of rate of mass transfer was done using the limiting diffusion current technique in which local limiting current measured at micro cathodes placed in the electrochemical cell would indicate the local mass transfer coefficient (Km). The current measurement was done with a precision digital multimeter interfaced by a data acquisition system to a personal computer. Some results shows that the convective mass transfer is proportionally influenced by the increase of Reynolds numbers of main flow velocity. Within the range of Re = 300 – 3000, the mass transfer coefficient increase to Km = 3.299 x 10-4 - 3.89 x 10-4 (m/s) which give some improvement up to 25.5 % of mass transfer rate compare to the case of electrochemical process with no flow condition. Furthermore, some correlations between Sherwood and Reynolds number are also discussed.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 32 x

Development of An Cooling System For Microelectronics Component By A Thermal Flow Management Based On Synthetic Jet Technology
Abstrak

This research investigated the flow and convective heat transfer characteristics of an impinging synthetic jet with different excitation modes. The synthetic air jet was generated by a vibrating membrane which pushed out the air from the cavity through the exit nozzles with oscillatory motion. The main purpose of this synthetic jet was to create vortices pair to come out  from nozzle which will accelerate the heat transfer process occuring at the impinged wall. This heat transfer enhamcement
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. The model was simulated to examine the distribution of heat flow on the impinged walls using a turbulent  model of k-w SST. Meshing order was elements Tet/Hybrid and type Tgrid and the number of grid was more than 230000 in order to ensure detail discretization and more accurate calculation results. In the experiment, sinusoidal, triangular and square waveform were generated with a function generator to oscillate the membranne. The frequency of membrane vibration were 80 Hz, 120 Hz, 160 Hz, and the velocity amplitude was 1 m/s. Some results  indicated significant influence of the excitation waveform to the cooling rate obtained.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 29 x

Perancangan Optimum Aktuator Jet Sintetik Double Acting Untuk Sistem Pendinginan Berkinerja Tinggi Pada Piranti Elektronik Mikro
Abstrak

Manusia modern membutuhkan piranti elektronik berukuran kecil yang mudah dibawa. Roadmap Teknologi SIA mengantisipasi setelah tahun 2011 frekuensi chip piranti elektronik mikro akan melebihi 17 Ghz dan dapat menghasilkan fluks panas lebih dari 90 W/cm2 dengan junction temperatur sebesar 100 celcius. Salah satu alternatif baru untuk mengurangi panas tersebut adalah dengan memanfaatkan efek vortek yang dihasilkan jet sintetik. Jet sintetik merupakan teknologi yang berbasis pada eksitasi membrane pada celah sempit guna menciptakan aliran vortek untuk mempercepat perpindahan panas dari sebuah heatsource

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 29 x

Forced Cooling on a Heated Wall with Impinging Flow Configuration Using Synthetic Jet Actuator Under Combined Wave Excitation
Abstrak

This research investigated the forced cooling characterization of an impinging synthetic jet under combined wave excitation. The synthetic jet cooling used an air flowing in a vertical direction into the heated wall. The synthetic jet actuator used two oscilating membranes to push and pull the air from and to the cavity. 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 application due to its advantage for having a small form factor and low noise. The investigation combined computational and experimental works. The model was simulated to examine the distribution of heat flow on the impinged walls using variation of turbulence model i.e. standard k-epsilon, realizable k-epsilon, standard k-omega and k-omega SST (Shear Stress Transport). Meshing order was elements tri and type pave and the number of grid was 4473 mesh faces to ensure detail discretization and more accurate calculation results. In the experiment the variation of sine and square wave signals were generated with sweep function generators to oscillate the membrane. The frequency of sine wave excitation for the first membrane was kept constant at 80 Hz, meanwhile the second membrane was excitated with varied square wave signals at 80 Hz, 120 Hz, and 160 Hz. Furthermore the velocity amplitude was 0.002 m/s. Some results indicate significant influence of the excitation, and combined waveform to the rate of heat transfer obtained.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 28 x

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