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Abstract:
This paper describes the experimental results on boiling heat
transfer and frictional pressure drop of high pressure steam-water
two-phase flow in internally ribbed tubes used in once-through boilers
of 300MW thermal power plants. The boiling heat transfer characteristics
in a vertical upward ribbed tube were experimentally investigated under
the conditions of pressure from 9.8 to 22.6 Mpa, mass velocity from 650
to 1750kg/m3﹒s, and inside wall heat four from 200 to 610kW/m2. The
adiabatic frictional pressure drop in a horizontal ribbed tube was
measured under the conditions of pressure from 9.8 to 20.6MPa, mass
velocity from 1530 to 3560kg/m2﹒s, and steam quality from 0.0 to 1.0.
Based on the experiments, the wall temperature profiles of the ribbed
tube and the effectivemess of the ribbed tubes for eliminating boiling
heat transfer deterioration are obtained, and a correlation for
calculating frictional pressure drop in the ribbed tudes is presented.
The heat transfer characteristics of three typed of internally ribbed
tubes with a similar internal configuration are compared and evaluated.
Key words:
电站锅炉 内螺纹管 沸腾传热 摩擦阻力
国家自然科学基金资助项目. Received 198907,
received in revised form 199006
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