Abstract
Secondary flow is the counter rotating vortex that appears in the channel when a fluid flows in a curved channel. The occurence of this secondary flow is caused by imbalance between centrifugal force and pressure on the outer wall of the channel. When Dean number is increased the additional secondary flow appears to the main secondary flow and/or disappears. This paper investigated the occurence of the additional secondary flow to the main flow with rectangular cross section and the radius of curvature varied from 1 to 10. The result shows that increament of curvature ratio the additional Dean voritces appears and beyond of ratio of 4 is constant. The effect of the additional secondary flow to the friction factor is also predicted.
Highlights
Secondary flow is the counter rotating vortex that appears in the channel when a fluid flows in a curved channel
This paper investigated the occurence of the additional secondary flow to the main flow with rectangular cross section and the radius of curvature varied from 1 to 10
"Numerical Heat Transfer and Fluid Flow", Washington D.C.: Hemisphere Publishing Corporation, 1980
Summary
Nursubyakto Jurusan Teknik Mesin, Fakultas Teknik, Universitas Merdeka Malang, Malang. Aliran ini terjadi pada aliran fluida yang melewati saluran yang melengkung atau berbelok, lebih singkat disebut dengan saluran lengkung, dan profil aliran adalah kembar dan saling berlawanan arah. Dengan meningkatnya kecepatan aliran melewati saluran lengkung akan muncul aliran sekunder baru (aliran sekunder tambahan) dengan intensitas lebih rendah dari aliran sekunder utama dan proses demikian disebut dengan ketidakstabilan aliran sekunder. Aliran sekunder tambahan ini lebih lemah dari aliran sekunder utama. Ketidakstabilan aliran sekunder dapat terjadi dan menghilang tergantung pada lemah kuatnya aliran sekunder tambahan. Saluran lengkung dengan penampang persegi dengan variasi rasio kelengkungan merupakan tinjauan dalam penelitian ini. Hasil numerik menunjukkan bahwa ketidakstabilan aliran sekunder sangat bergantung pada rasio kelengkungan di mana semakin besar rasio kelengkungan aliran sekunder tambahan cenderung mudah muncul. Kata kunci: Aliran sekunder, saluran lengkung, penampang persegi
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