Mixture Fraction Statistics of Plane Self-Preserving Buoyant Turbulent Adiabatic Wall Plumes  

Oleh:

Sangras, R. ; Dai, Z. ; Faeth, G. M.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 121 no. 4 (Nov. 1999), page 837-843.
Topik: adiabatic flow; mixture fraction; plane; self - preserving; bouyant; turbulent; adiabatic; wall plumes

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.1 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Measurements of the mixture fraction properties of plane buoyant turbulent adiabatic wall plumes (adiabatic wall plumes) are described, emphasizing conditions far from the source where self - preserving behavior is approximated. The experiments involved helium / air mixtures rising along a smooth, plane and vertical wall. Mean and fluctuating mixture fractions were measured using laser - induced iodine fluorescence. Self-preserving behaviour was observed 92 – 155 source widths above the source, yielding smaller normalized plume widths and near - wall mean mixture fractions than earlier measurements. Self - preserving adiabatic wall plumes mix slower than comparable free line plumes (which have 58 percent larger normalized widths) because the wall prevents mixing on one side and inhibits large - scale turbulent motion. Measurements of probability density functions, temporal power spectra, and temporal integral scales of mixture fraction fluctuations are also reported.

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