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ISSN Online: 2377-424X

International Heat Transfer Conference 12
August, 18-23, 2002, Grenoble, France

Experimental heat transfer comparison in air-water slug flow in a slightly upward inclined tube

Get access (open in a dialog) DOI: 10.1615/IHTC12.2410
6 pages

Abstract

This paper presents a study on the heat transfer in air-water slug flow in a slightly upward inclined tube, a widely appearing flow pattern in inclined two-phase flow regimes. Local heat transfer coefficients and flow parameters have been measured for air-water flow in a pipe (2.79cm I.D. and L/D = 100) in the horizontal orientation and at 2° and 5° upward inclinations. The heat transfer data with air-water slug flow pattern were measured under uniform wall heat flux boundary condition ranging from 5,677 to 10,724 W/m2. A total of 122 data points were taken with 61 in the 5° incline (as the basis), 30 in the horizontal and 31 in the 2° incline position. The superficial Reynolds number ranged from 4300 to 28,000 for the water and from 800 to 5700 for the air in the horizontal case. Data is compared with similar superficial Reynolds number values at the 2° and 5L inclinations. The 2° and 5° data show an average increase over the horizontal of about 10% and 20%, respectively, over the entire range of flows rate. The 5° data indicated a 10% increase over the 2° data.