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dc.contributor.supervisor Soliman,Hassan (Mechanical and Manufacturing Engineering) en_US
dc.contributor.author Elazhary, Amr Mohamed Ali
dc.date.accessioned 2012-07-27T19:38:17Z
dc.date.available 2012-07-27T19:38:17Z
dc.date.issued 2012-07-27
dc.identifier.uri http://hdl.handle.net/1993/8129
dc.description.abstract An experimental study was conducted in order to investigate the two-phase-flow phenomena in a mini-size, horizontal impacting tee junction. The test section was machined in an acrylic block with a rectangular cross-section of 1.87-mm height × 20-mm width on the inlet and outlet sides. Air-water mixtures at 200 kPa (abs) and room temperature were used as the test fluids. Four flow regimes were identified visually: bubbly, plug, churn, and annular over the ranges of gas and liquid superficial velocities of 0.04 ≤ JG ≤ 10 m/s and 0.02 ≤ JL ≤ 0.7 m/s, respectively, and a flow regime map was developed. The present flow-regime map was compared with several experimental maps. It is thought from those comparisons that the channel height has a more significant role in determining the flow-regime boundaries than the hydraulic diameter. The two-phase fully-developed pressure gradient was measured in the inlet and the outlet sides of the junction for six different inlet conditions and various mass splits at the junction. Comparisons were conducted between the present data and former correlations. The correlations that agreed best with the present data were identified. Five single-phase test sets were performed. In each set of experiments, the pressure distribution was measured for the whole range of the mass split ratio, Wi/W1. The pressure drop at the junction at each value of Wi/W1 was calculated. Values of the pressure-loss coefficient, , were calculated at various Wi/W1 and inlet Reynolds number. The pressure-loss coefficient was strongly dependent on the inlet Reynolds number in the laminar region, while the results for the turbulent region were almost coincident. Numerical simulations of single-phase flow in an impacting tee junction of identical dimensions to that of the present test-section were performed to confirm the results of the experiments. Phase-redistribution experiments were conducted covering all four inlet flow regimes and models were proposed for predicting the experimental data. Good agreement in terms of magnitude and trend was obtained between the present experimental data and the proposed model. New correlations were developed for the single- and two-phase pressure drop in the junction. en_US
dc.subject two-phase en_US
dc.subject pressure-drop en_US
dc.subject phase-redistribution en_US
dc.subject modeling en_US
dc.subject experimental en_US
dc.subject flow-regimes en_US
dc.subject maps en_US
dc.subject pressure-gradient en_US
dc.title Two-phase flow in a mini-size impacting tee junction with a rectangular cross-section en_US
dc.degree.discipline Mechanical and Manufacturing Engineering en_US
dc.contributor.examiningcommittee Ormiston, Scott (Mechanical and manufacturing Engineering) Shafai, Cyrus (Electrical and Computer Engineering) Azzopardi, Barry (University of Nottingham) en_US
dc.degree.level Doctor of Philosophy (Ph.D.) en_US
dc.description.note October 2012 en_US


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