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Judul: Pengaruh Jarak Alur Terhadap Kekuatan Vortex Dan Bilangan Reynold Kritis Aliran Fluida Berdenyut Dalam Saluran Berpenampang Segi Empat
Penulis: Prayitno Ciptoadi  || email: teknologi@rad.net.id
Jurnal: Teknologi Vol. 8 no. 1 - hal. 867 - 874 Tahun 2011  [ Teknik ]
Keywords:  Pulsatile flow, grooved channel, laminar flow, vortex strength, critical Reynold number
Abstract: The pulsatile fluid flow in a transverse grooved channel would becomes self-sustained oscillatory flow at certain critical Reynold number. The critical Reynold number where laminar unsteady flow changed to unsteady transitional one depends on grooves distances. The objective of this research is to analyze the effect of grooves distances toward the vortex strenght and the critical Reynold number. This research was done by implementing a closed square cross section channel, where the bottom surface of the channel was semicircle grooved. The frequency of flow oscillation measurement was done by setting up a resistance manometer and a U manometer was used to measure the static pressure, measurement was done together at severals Reynold number. From the research result it is seen that the largest vortex strength occurs at the smallest groove distance with the increase of pressure drop. The critical Reynold number becomes larger when grooves distances increase that is for groove distance of 1/2 and 3/4 time its circumference is 700 while for grooves distances equal its circumference is 950.
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