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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

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 : 64 x

Flow and Heat Transfer Characteristics of an Impinging Synthetic Air Jet under Sinusoidal and Triangular Wave Forcing
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 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. The model was simulated to examine the distribution of heat flow on the impinged walls using a turbulent model of k-ω SST. Meshing order was elements Tet/Hybrid and type Tgrid and the number of grid was more than 230 000 in order to ensure detail discretization and more accurate calculation results. In the experiment, sinusoidal and triangular waveform were generated with a function generator to oscillate the membrane. 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 rate of heat transfer obtained.

Penulis : DAMORA RHAKASYWI, DR., ST., MT [PDF File] didownload : 63 x

Intellectual Capital And Firm Performance
Abstrak
Penulis : YETTY MURNI, Dr.Hj. SE. Ak.MM.CA [PDF File] didownload : 62 x

The Influence of managerial ownership nd voluntarydisclosure on financial performance and its implication on the corporate value Analisis Pengaruh Lingkungan Dalam Toserba XYZ, Bogor Terhadap Pembelia
Abstrak
Penulis : YETTY MURNI, Dr.Hj. SE. Ak.MM.CA [PDF File] didownload : 67 x

Analisis Factor factor Yang Mempengaruhi Struktur Modal Perusahaan Mnufaktur Sector Industri Dasar Dan Kimia Di Indonesia
Abstrak
Penulis : YETTY MURNI, Dr.Hj. SE. Ak.MM.CA [PDF File] didownload : 63 x

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