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First Thermal and Fluids Engineering Summer Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

HEAT TRANSFER MEASUREMENTS AND CORRELATIONS ASSESSMENT FOR UPWARD INCLINED GAS-LIQUID TWO PHASE FLOW

DOI: 10.1615/TFESC1.mph.012494
pages 1867-1881

Ranga N. K. Korivi
School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078, USA

Swanand M. Bhagwat
School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078, USA

Afshin J. Ghajar
School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, OK 74078, USA


KEY WORDS: Two phase flow, non-boiling heat transfer, upward inclination, flow patterns, heat transfer correlations

Abstract

Non-boiling heat transfer in gas-liquid two phase flow embraces some of the practical applications pertinent to chemical and oil and industry. In comparison to horizontal and vertical upward two phase flows, very little information is available about non-boiling heat transfer in upward pipe inclinations. To further understand this phenomenon, 679 experimental measurements of the local and space averaged two phase heat transfer coefficients are carried out in 0°, +5°, +10°, +20°, +30°, +45°, +60°, +75° and +90° degrees of pipe inclinations using air-water fluid combination in a 12.5 mm I.D. stainless steel pipe. The measured non-boiling two phase heat transfer coefficients are found to be influenced by phase flow rates, pipe orientation and flow patterns. The two phase heat transfer coefficient is observed to increase with increase in pipe orientation from horizontal in the vicinity of +45° to +60° and then shows a decreasing trend as the pipe is inclined towards vertical position. The effect of change in flow pattern structure on the measured two heat transfer coefficient is noticeable for bubbly and slug flows compared to that in intermittent and annular flow patterns. The heat transfer coefficient in two phase flow is found up to 5-6 times greater than that in single phase flow. The experimental data (679 data points) measured in this work are also used to scrutinize the performance of some of the existing non-boiling two phase heat transfer correlations available in the literature. Based on a statistical performance, the top performing correlations for different flow patterns and pipe orientations are recommended.

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