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Karakteristik perpindahan panas konvektif jet sintetik dengan variasi jarak tumbukan = Convective heat transfer characteristic of synthetic jet with variation of impinging distance

Situngkir, Christoforus Deberland; Harinaldi, supervisor; Budiarso, examiner; Warjito, examiner; Agus Sunjarianto Pamitran, examiner; Yudan Whulanza, examiner (Fakultas Teknik Universitas Indonesia, 2013)

 Abstrak

Dewasa ini, beban panas yang semakin besar akibat meningkatnya kecepatan operasi
dan densitas komponen pada suatu piranti elektronik menyebabkan perlunya sistem
pendingin baru yang lebih efisien atau mempunyai disipasi panas yang tinggi. Jet
sintetik potensial untuk digunakan sebagai pendingin komponen elektronik. Paper ini
melaporkan hasil dari studi eksperimental mengenai pengaruh Jarak Tumbukan
(impinging distance) pada performa pendinginan dengan tumbukan jet sintetik. Rasio
jarak aksial antara permukaan yang dipanaskan dan jet (L) terhadap diameter orifis jet
(d) berada pada jangkauan 0-3.3. Investigasi dilakukan dengan menggunakan
prototipe jet sintetik yang memiliki 16 lubang dengan diameter tiap lubang 3 mm dan
digerakkan oleh dua membran piezoelektrik 5 volt dengan eksitasi gelombang
sinusoidal. Dengan sistem aparatus tersebut diteliti karakteristik dari perpindahan
panas konvektif yang dihasilkan membran yang berosilasi. Hasil penelitian
menunjukkan adanya pengaruh ketinggian orifis yang signifikan terhadap laju
perpindahan panas yang didapat. Pada frekuensi eksitasi tinggi 160 Hz, kenaikkan
nilai perpindahan sebanding dengan kenaikkan rasio L/d hingga nilai L/d sebesar 2
kemudian turun hingga L/d sebesar 3,3.

Nowadays, A greater heat load due to miniaturization of electronic products causes
the need for a new cooling system that works more efficient and has a high thermal
efficiency, Synthetic jet is potentially useful for cooling of electronic components. In
this study, numerical simulations are performed to investigate the effect of various
the distance between the orifice and the heated surface (L) on the ensuing synthetic
jet flow. In this research the investigation was carried out by comtutational methods
using the software CFD (Computational Fluid Dynamics), it will be seen the
characteristics of convective heat transfer by moving the synthetic jet membrane. A
circular orifice synthetic jet is simulated assuming axisymmetric behaviour. The
quality of results is verified by time and convective heat transfer studies, and the
results are validated against existing experimental. In this research the model was
simulated to examine the distribution of heat flow on the walls using a mathematical
turbulen model k-w SST. Meshing order was elements Tet/Hybrid and type Tgrid.
The boundary conditions were inlet velocity of 1.5 m/s, 2 m/s and 1 m/s, the
frequency of membrane vibration were 80 Hz, 120 Hz, 160 Hz and the amplitude
were 1 mm/s, 2 mm/s, 1.5 mm/s. The Reynolds number (Re) is in the range of 1421 –
2843 based on average velocity, while the normalized axial distance varies between 0
and 3.3. The movement of the piezo membrane is assumed of sinusoidal motion
which moves up and down correspond to the suction and blowing phase respectively.
The results showed the significant influence of L/D Ratio and sinusoidal wave
frequencies to the heat transfer rate that obtained. At small axial distance (L),
recirculation of fluid occurs due to confinement, owing to the presence of the orifice
plate. However, at large axial distances, the jet velocity reduces due to entrainment of
still ambient air, which again reduces the heat transfer coefficient.

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 Metadata

No. Panggil : T35771
Entri utama-Nama orang :
Entri tambahan-Nama orang :
Entri tambahan-Nama badan :
Subjek :
Penerbitan : Depok: Fakultas Teknik Universitas Indonesia, 2013
Program Studi :
Bahasa : ind
Sumber Pengatalogan : LibUI ind rda
Tipe Konten : text
Tipe Media : unmediated ; computer
Tipe Carrier : volume ; online resource
Deskripsi Fisik : xvii, 97 pages : illustration ; 28 cm.+ appendix
Naskah Ringkas :
Lembaga Pemilik : Universitas Indonesia
Lokasi : Perpustakaan UI, Lantai 3
  • Ketersediaan
  • Ulasan
No. Panggil No. Barkod Ketersediaan
T35771 15-23-89352585 TERSEDIA
Ulasan:
Tidak ada ulasan pada koleksi ini: 20350103