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Multiphase Science and Technology
SJR: 0.124 SNIP: 0.222 CiteScore™: 0.26

ISSN Print: 0276-1459
ISSN Online: 1943-6181

Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.v27.i2-4.10
pages 99-115

CHARACTERISTICS OF GAS AND NON-NEWTONIAN LIQUID TWO-PHASE FLOWS THROUGH A CIRCULAR MICROCHANNEL

Akimaro Kawahara
Faculty of Advanced Science and Technology, Kumamoto University, Chuo-Ku, Kurokami 2-39-1, Kumamoto City, 860-8555, Japan
Michio Sadatomi
Department or Advanced Mechanical System, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Chuo-Ku, Kumamoto City, 860-8555, Japan
Wen Zhe Law
Department or Advanced Mechanical System, Graduate School of Science and Technology, Kumamoto University, Kurokami 2-39-1, Chuo-Ku, Kumamoto City, 860-8555, Japan
Mohamed H. Mansour
Department or Mechanical Power Engineering, Mansoura University, El-Goumhoria Street, EL-Mansoura 35516, Egypt

ABSTRACT

In this study, gas and non-Newtonian liquid two-phase flows in a horizontal circular microchannel have been investigated. The microchannel was a fused silica capillary tube with 0.25 mm inside diameter. Polyacrylamide aqueous solutions with different mass concentrations, which exhibit pseudo-plastic behavior with viscoelasticity, were used as non-Newtonian liquids, while nitrogen gas was used as the test gas. The flow pattern, the bubble length, the liquid slug length, the bubble velocity, and the void fraction were measured. The experimental data are compared to those for nitrogen gas and water two-phase flow. From the comparison, rheological properties of polyacrylamide solutions are found to significantly affect the flow parameter measured. Both bubble length and liquid slug length are much longer for the polyacrylamide solution than the water. Bubble velocity increases with concentration of polyacrylamide, especially for higher total volumetric flux. The bubble velocity for both the water and the polyacrylamide solution could be correlated with a drift flux model by using a newly developed distribution parameter equation, which is a function of capillary number and Laplace number. Void fraction decreases with increasing of polyacrylamide at fixed homogeneous void fraction. Void fraction for both Newtonian and non-Newtonian liquids could be correlated by the Kawahara et al. equation (Kawahara, A., Sadatomi, M., Kawaji, M., Okayama, K., and Chung, P. M.-Y., Assessment of Void Fraction Correlations for Adiabatic Two-Phase Flows in Microchannels, Proceedings of 3rd International Conference on Microchannels and Minichannels, Paper No. ICMM2005-75031, 2005) with the Lockhart-Martinelli parameter.


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