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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 DOWNWARD INCLINED GAS-LIQUID TWO PHASE FLOW

DOI: 10.1615/TFESC1.mph.012493
pages 1851-1865

Tarebi J. John
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, downward inclination, flow patterns, heat transfer correlations

Abstract

Non-boiling heat transfer in downward inclined gas-liquid two phase flow is quite intriguing and is one of the least studied phenomenon in the two phase flow literature. To explore and understand this phenomenon, experiments are carried out to measure the local and averaged non-boiling two phase heat transfer coefficient (hTP) in 0, -5, -10, -20, -30, -45, -60, -75 and -90 degrees of pipe inclinations. The experiments are carried out with uniform wall heat flux boundary condition in 12.5 mm I.D. stainless steel pipe that uses air-water as fluid combination and consists of all flow patterns that covers the and liquid superficial Reynolds numbers in a range of 270 to 19000 and 2300 to 17000, respectively. It is observed that an increase in downward pipe inclination from horizontal initially exhibits a decreasing tendency of hTP till -30 degrees and thereafter increases consistently with further increase in the pipe inclination towards vertical downward direction. The general trends of two phase heat transfer coefficients are found to be closely related to the physical structure of the flow patterns and their morphological variations as a function of pipe orientation and phase flow rates. The measured data is compared against some of the non-boiling two phase heat transfer correlations available in the two phase flow literature. Based on a statistical comparison, the relatively top performing correlations are identified and a scope for further improvements is established.

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