Pool Boiling Heat Transfer From Plain and Microporous, Square Pin-Finned Surfaces in Saturated FC-72  

Oleh:

Rainey, K. N. ; You, S. M.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Heat Transfer vol. 122 no. 3 (Aug. 2000), page 509-516.
Topik: pool boiling; pool boiling; heat transfer; microporous; square pin - finned; saturated FC-72

Ketersediaan

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

Lihat Detail Induk

Isi artikel

The present research is an experimental study of "double enhancement" behaviour in pool boiling from heater surfaces simulating microelectronic devices immersed in saturated FC - 72 at atmospheric pressure. The term "double enhancement" refers to the combination of two different enhancement techniques : a large - scale area enhancement (square pin fin array) and a small - scale surface enhancement (microporous coating). Fin lengths were varied from 0 (flat surface) to 8 mm. Effects of this double enhancement technique on critical heat flux (CHF) and nucleate boiling heat transfer in the horizontal orientation (fins are vertical) are investigated. Results showed significant increases in nucleate boiling heat transfer coefficients with the application of the microporous coating to the heater surfaces. CHF was found to be relatively insensitive to surface microstructure for the finned surfaces except in the case of the surface with 8 - mm - long fins. The nucleate boiling and CHF behaviour has been found to be the result of multiple, counteracting mechanisms : surface area enhancement, fin efficiency, surface microstructure (active nucleation site density), vapor bubble departure resistance, and re - wetting liquid flow resistance.

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