Heat transfer characteristics of water in a vertical small diameter tube at sub-atmospheric pressure

• Autorzy: Chowdhury F. , Kaminaga F.
• Języki publikacji: EN

Abstrakty

EN

Boiling heat transfer characteristics of water has been experimentally and analytically examined in a vertical small diameter tube, D = 1.45 mm, L = 100 mm at sub-atmospheric pressures of 5, 11, and 22 kPa under natural circulation condition. Distinct S-shape boiling curves with three different slopes: a slope similar to pool boiling at a low heat flux, a negative slope at a medium heat flux and a slope smaller than that of pool boiling at a high heat flux, have been observed. Comparing the experimental vapour flux with the predicted one, the flow regime might have been annular within our experimental range. Pool boiling correlation of Stephan- Abdelsalam and a boiling correlation of Imura, et al. developed for a thermosyphon correlated well the measured data at low and medium heat flux regions. In the region of high heat flux a large boiling heat transfer enhancement is indicated in the form of S-shape curves. Predictions of heat transfer coefficient by conduction through the thin liguid film gave good results in the region of high heat flux.

Słowa kluczowe

EN

boiling; confined space; heat transfer enhancement; Low flow rate; low pressure

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2002
• Tom: Vol. 23, no 3
• Strony: 43--57
• Opis fizyczny: Bibliogr. 13 poz.,

Twórcy

autor

Chowdhury F.

• Mechanical Engineering Department Ibaraki University, Nakanarusawa Hitachi, Japonia

autor

Kaminaga F.

• Mechanical Engineering Department Ibaraki University, Nakanarusawa Hitachi, Japonia

• Mechanical Engineering Department Ibaraki University, Nakanarusawa Hitachi, Japonia

Bibliografia

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