STUDI EKSPERIMENTAL PENGARUH JUMLAH DAN DIAMETER LUBANG PADA SIRIP SEKELILING SILINDER LUAR TERHADAP LAJU PERPINDAHAN KALOR
| Main Authors: | , Joko Winarno,ST., , Ir. Samsul Kamal, M.Sc., Ph.D., |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2012
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/97585/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=54081 |
Daftar Isi:
- An experimental study was conducted to investigate the effect of number and diameter of the hole on the outside cylinder fin to the rate of heat transfer in the blowing air. The radial rectangular profile fin in 0,0195 m length with thikness of 0,0021 m were mounted on heating cylinder with outside diameter of 0,0398 m. The diameter of the fin tip was 0,0788 m. Two similar models made of aluminium were employed in this work, one model was used to investigate the effect of hole diameter on the outside cylinder fin to the rate of heat transfer for given hole number, and the other model was used to investigate the effect of hole number on the outside cylinder fin to the rate of heat transfer for given hole diameter. Multipurpose air duct was used for providing blowing air which the velocity of the inlet air could varied with the throtle slide. The Reynolds number based on the flow averaged inlet velocity and the hydraulic diameter of the cylinder, ranged from 1600 to 7000. The experimental parameters were Reynolds Number, hole diameter and the number of the hole. The effect hole diameter of the fin was studied for one-fixed the number of the hole (N = 8) and six different diameter of the hole (DL = 5,6,7,8,9,10 mm), and The effect of the number of the hole of the fin was studied for one-fixed diameter of the hole (DL = 5 mm) and five different number of the hole (NL = 8,12,16,20,24). The rate of the heat transfer, friction factor and the effectiveness were presented graphical form for both case. The experimental results showed that rate of heat transfer of the outside cylinder fin increased in given situation by increasung the value of the Reynlods number for all cases of the fin. For the first case, rate of heat transfer of the outside cylinder fin increased by increasung the value of diameter of the hole, but the limit is reached when the area ratio approximate 0,07 mm, and for the second case, rate of heat transfer of the outside cylinder fin increased by increasung the number of the hole, but the limit is reached when the area ratio was about 0,09. The friction factor reduced by increasung the value of the Reynlods number and increased by increasing the value of the number and diameter of the hole on the outside cylinder fin. The value of effectiveness was above 2 for all cases of the fin.