Heat transfer of a gas and liquid two-phase flow in helical coiled tubes

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Heat Transfer - Japanese Research; (United States)

OSTI ID:5049417

Watanabe, O; Tajima, O ^[1]; Shimoya, M ^[2]; Fujita, H ^[3]

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1. Dept. of Mechanical Engineering, Aichi Inst. of Technology (JP)
2. Nippon Denso Co., Ltd. (JP)
3. Dept. of Mechanical Engineering, Nagoya Univ. (JP)

In this paper, the distribution of local void fraction and heat-transfer coefficient of an air-water two-phase flow in helical coils are measured, and the effects of coil diameter and inclined angle on heat-transfer characteristics are investigated. When the coil is placed horizontally, there are fairly large differences in the void fraction distribution and the local heat-transfer coefficient between the upper and lower positions of the coil. The heat- transfer characteristics can be divided into three regions by the Lockhart-Martinelli parameter, 1/X{sub tt}, for coils of any diameter. Among these regions, the effects of angle of inclination are significant in the second and third regions. Finally, correlations between the average heat-transfer coefficient and 1/X{sub tt} are proposed.

• OSTI ID: 5049417
• Journal Information: Heat Transfer - Japanese Research; (United States), Vol. 19:5; ISSN 0096-0802
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
GASES
HEAT TRANSFER
LIQUIDS
TUBES
TWO-PHASE FLOW
ELECTRIC COILS
PARAMETRIC ANALYSIS
TEMPERATURE COEFFICIENT
VOID FRACTION
ELECTRICAL EQUIPMENT
ENERGY TRANSFER
EQUIPMENT
FLUID FLOW
FLUIDS
REACTIVITY COEFFICIENTS
420400* - Engineering- Heat Transfer & Fluid Flow