Parameter Penentu Gerakan Chaos Air pada Ketidakstabilan Rayleigh-benard dalam Ketel Uap  

Oleh:

Wardana, L.N.G. ; Wijaya, Hastono ; Siswanto, Eko

Jenis: Article from Journal - ilmiah nasional
Dalam koleksi: Jurnal Ilmu-Ilmu Teknik (Engineering) vol. 18 no. 1 (Apr. 2006), page 13-20.
Topik: Chaos; Rayleigh-Benard Instability; Steam Boiler; Energy Conversion Efficiency

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ106 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

A chaotic fluid motion is very important in heat transfer augmentation. This, the aim of this study is to find out the most dominant parameter determining chaotic motion of water in a steam boiler. The focus of this research is to analyze the effect of boiler aspect ratio, water motion period induced by Rayleigh-Benard instability, and the thermal properties of water during boiling on the chaotic motion behavior. The research is carried out mathematically by computer simulation based on Lorenz equation that is a couple between energy equation and momentum equation. The solution of the equation is computed with 8000 iterations. The trajectory of attractor in phase space from the iteration is verified experimentally by using simple schlieren visualization technique and a temperature data acquisition. The results show that though the chaotic motion in a boiler is determined by Rayleigh number , Prandtl number, and aspect ratio, only two are very dominant, namely, Rayleigh number and Prandtl number. The Rayleigh number determines the pattern of chaos and the Prandtl number determines whether the chaos takes place or not. Boiling process with chaotic motion takes ninth shorter time than the conventional one and save the energy nearly 50 percent.

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