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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

HEAT TRANSFER TO NON-NEWTONIAN LIQUID-GAS MIXTURES FLOWING THROUGH HORIZONTAL TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC8.1890
pages 943-949

Sinopsis

Experimental heat transfer data were obtained for pseudoplastic liquid-air mixtures flowing through 0.028 and 0.057 meter diameter electrically heated horizontal tubes. Based on superficial velocities, the liquid flow regime was laminar while that of the gas was generally in the transitional or turbulent flow regime. The flow pattern was plug and slug; flow indices and consistency parameters ranged from 0.51 to 0.85 and 2.31 to 0.064 Nsn/m2 respectively. Thermocouples positioned at three or four peripheral locations and several axial stations along the heated tube provided a detailed wall temperature profile. Most of the data indicated that higher heat transfer coefficients existed at the top of the tubes. Several competing mechanisms were identified and explored in the heat transfer process including two-phase laminar flow drag reduction. The heat transfer data were compared with reported non-Newtonian liquid-gas heat transfer results. Heat transfer correlations were developed for the tube top, the tube bottom, and the overall tube average.