Detail Mist/Steam Cooling in A 180-Degree Tube Bend   Oleh:  Gaddis, J. Leo ; Tao, Guo ; Ting, Wang Jenis: Article from Bulletin/Magazine Dalam koleksi: Journal of Heat Transfer vol. 122 no. 4 (Nov. 2000), page 749-756. Topik: cooling; mist / steam cooling; tube bend Ketersediaan Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ90.4 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel An experimental study on mist / steam cooling in a highly heated, horizontal 180 - deg tube bend has been performed. The mist / steam mixture is obtained by blending fine water droplets (3 ~ 15 microns) with the saturated steam at 1.5 bar. The test section consists of a thin wall (~ 0.9 mm), welded, circular, stainless steel 180 - deg tube (20 - mm inside diameter) with a straight section downstream of the curved section, and is heated directly by a DC power supply. The experiment was conducted with steam Reynolds numbers ranging from 10,000 to 35,000, wall superheat up to 300°C, and droplet to steam mass ratio at about 1 ~ 2 percent. The results show that the heat transfer performance of steam can be significantly improved by adding mist into the main flow. The highest enhancement occurs at a location about 45 - deg downstream of the inlet of the test section. Generally, only a small number of droplets can survive the 180 - deg turn and be present in the downstream straight section, as observed by a phase Doppler particle analyzer (PDPA) system. The overall cooling enhancement of the mist / steam flow ranges from 40 percent to 300 percent. It increases as the main steam flow increases, but decreases as the wall heat flux increases. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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