Investigation into the Total Dissolved Gas Dynamics of Wells Dam Using a Two-Phase Flow Model
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 10
Abstract
Bubbles entrained by spilled water at hydroelectric projects increase the concentration of total dissolved gas (TDG), which may lead to gas bubble disease in fish. In this paper, the TDG dynamics downstream of Wells Dam are investigated using a two-phase flow model that accounts for the effect of the bubbles on the flow field. The TDG is calculated with a transport equation in which the source is the bubble/liquid mass transfer, a function of the gas volume fraction and bubble size. The model uses anisotropic turbulence modeling and includes attenuation of normal fluctuation at the free surface to capture the flow field and TDG mixing. The model is validated using velocity and TDG field data. Simulations under two plant operational configurations are performed to gain a better understanding of the effect of spill operations on the production, transport, and mixing of TDG. Model results indicate that concentrated spill releases create surface jets that result in the lowest TDG concentration downstream. On the other hand, spreading the spill release, with moderate flow through each gate, produces the highest TDG values downstream as a result of more air available for dissolution and smaller degasification at the free surface.
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References
Ansys, Inc. (2006). FLUENT 6 user’s guide, Canonsburg, PA.
Antal, S. P., Lahey, R. T., Jr., and Flaherty, J. E. (1991). “Analysis of phase distribution in fully developed laminar bubbly two-phase flow.” Int. J. Multiphase Flow, 17(5), 635–652.
Battino, R., and Clever, H. L. (1966). “The solubility of gases in liquids.” Chem. Rev., 66(4), 395–463.
Bombardelli, F. A., Buscaglia, G. C., Rehmann, C. R., Rincon, L. E., and Garcia, M. (2007). “Modelling and scaling of aeration bubble plumes: A two phase flow analysis.” J. Hydraul. Res., 45(5), 617–630.
Chanson, H., Aobi, S., and Hoque, A. (2004). “Physical modelling and similitude of air bubble entrainment at vertical circular plunging jets.” Chem. Eng. Sci., 59(4), 747–758.
Clift, R., Grace, J. R., and Weber, M. E. (1978). Bubbles, drops, and particles, Academic, New York.
Deckwer, W. D. (1992). Bubble column reactors, Wiley, New York.
DeMoyer, C. D., Schierholz, E. L., Gulliver, J. S., and Wilhelms, S. C. (2003). “Impact of bubble and free surface oxygen transfer on diffused aeration systems.” Water Res., 37(8), 1890–1904.
Dos Santos, C. M., Dionisio, R., Cerqueira, H. S., Sousa-Aguiar, E. F., Mori, M., and d’Avila, M. A. (2007). “Three-dimensional gas-liquid CFD simulations in cylindrical bubble columns.” Int. J. Chem. React. Eng., 5, A90.
Drew, D. A. (2001). “A turbulent dispersion model for particles and bubbles.” J. Eng. Math., 41, 259–274.
EES Consulting, Inc., Carroll, J., ENSR, and Parametrix. (2007). “Total dissolved gas production dynamics: Study of the Wells hydroelectric project.” Rep. Prepared for Public Utility District No. 1 of Douglas County, Kirkland, WA.
Geldert, D. A., Gulliver, J. S., and Wilhelms, S. C. (1998). “Modeling dissolved gas supersaturation below spillway plunge pools.” J. Hydraul. Eng., 124(5), 513–521.
Haug, P., and Weber, L. (2006). “Hydraulic model studies for fish diversion at Wanapum/Priest Rapids development, Part XVI: Construction of 1:52 scale Wanapum tailrace model and comparison of model data with field observations.” Limited Distribution Rep. No. 343, IIHR—Hydroscience and Engineering, Iowa City, IA.
Hibbs, D. E., and Gulliver, J. S. (1997). “Prediction of effective saturation concentration at spillway plunge pools.” J. Hydraul. Eng., 123(11), 940–949.
Ishii, M., and Zuber, N. (1979). “Drag coefficient and relative velocity in bubbly, droplet or particulate flows.” AIChE J., 25(5), 843–855.
Kerdouss, F., Bannari, A., and Proulx, P. (2006). “CFD modeling of gas dispersion and bubble size in a double turbine stirred tank.” Chem. Eng. Sci., 61(10), 3313–3322.
Lamont, J. C., and Scott, D. S. (1970). “An eddy cell model of mass transfer into the surface of a turbulent liquid.” AIChE J., 16(4), 513–519.
Li, S., and Weber, L. (2006). “Comprehensive comparison of the three-dimensional computational fluid dynamics (CFD) model outputs with field data of the Wanapum Dam forebay and tailrace.” Limited Distribution Rep. 335, IIHR—Hydroscience and Engineering, Iowa City, IA.
Linek, V., Kordac, M., Fujasova, M., and Moucha, T. (2004). “Gas-liquid mass transfer coefficient in stirred tanks interpreted through models of idealized eddy structure of turbulence in the bubble vicinity.” Chem. Eng. Proc., 43(12), 1511–1517.
Lopez de Bertodano, M. L., Lahey, R. T., Jr., and Jones, O. C. (1994). “Development of a model for bubbly two-phase flow.” J. Fluids Eng., 116(1), 128–134.
Manninen, M., Taivassalo, V., and Kallio, S. (1996). “On the mixture model for multiphase flow.” VTT Publications 288, VTT Technical Research Centre, Finland.
Maynard, C. (2008). “Evaluation of total dissolved gas criteria (TDG) biological effects research: a literature review.” Rep. No. 08-10-059, Washington State Dept. of Ecology, Olympia, WA.
Orlins, J. J., and Gulliver, J. S. (2000). “Dissolved gas supersaturation downstream of a spillway II: Computational model.” J. Hydraul. Res., 38(2), 151–159.
Picket, J., and Harding, R. (2002). “Total maximum daily load for lower Columbia River total dissolved gas.” Rep. No. 02-03-004, Oregon Dept. of Environmental Quality and Washington State Dept. of Ecology, Portland, OR, and Olympia, WA.
Picket, J., and Herold, M. (2003). “Total maximum daily load for total dissolved gas for lower Snake River.” Rep. No. 03-03-20, Washington State Dept. of Ecology, Olympia, WA.
Picket, J., Rueda, H., and Herold, M. (2004). “Total maximum daily load for total dissolved gas in the Mid-Columbia River and Lake Roosevelt.” Submittal Rep. No. 04-03-002, Washington State Dept. of Ecology, Olympia, WA.
Politano, M. S., Carrica, P. M., and Converti, J. (2003). “A model for turbulent polydisperse two-phase flow in vertical channel.” Int. J. Multiphase Flow, 29(7), 1153–1182.
Politano, M. S., Carrica, P. M., Turan, C., and Weber, L. (2007). “A multidimensional two-phase flow model for the total dissolved gas downstream of spillways.” J. Hydraul. Res., 45(2), 165–177.
Politano, M. S., Carrica, P. M., and Weber, L. (2009). “A multiphase model for the hydrodynamics and total dissolved gas in tailraces.” Int. J. Multiphase Flow, 35(11), 1036–1050.
Takemura, F., and Yabe, A. (1998). “Gas dissolution process of spherical rising gas bubbles.” Chem. Eng. Sci., 53(15), 2691–2699.
Tomiyama, A. (1998). “Struggle with computational bubble dynamics.” Proc., 3rd Int. Conf. on Multiphase Flows, ICMF Governing Board, Lyon, France.
Turan, C., Carrica, P. M., Lyons, T., Hay, D., and Weber, L. (2008). “Study of the free surface flow on an ogee-crested fish bypass.” J. Hydraul. Eng., 134(8), 1172–1175.
Turan, C., Politano, M. S., Carrica, P. M., and Weber, L. (2007). “Water entrainment and mixing due to surface jets.” Comput. Fluid Dyn. J., 21(3–4), 137–153.
Urban, A. L., Gulliver, J. S., and Johnson, D. W. (2008). “Modelling total dissolved gas concentration downstream of spillways.” J. Hydraul. Eng., 134(5), 550–561.
Weber, L. J., Huang, H., Lai, Y., and McCoy, A. (2004). “Modeling total dissolved gas production and transport downstream of spillways: Three-dimensional development and applications.” Int. J. River Basin Manage., 2(3), 157–167.
Zheng, L., and Yapa, P. D. (2000). “Buoyant velocity of spherical and non-spherical bubbles/droplets.” J. Hydraul. Eng., 126(11), 852–855.
Zheng, L., and Yapa, P. D. (2002). “Modeling gas dissolution in deepwater oil/gas spills.” J. Marine Sys., 31(4), 299–309.
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© 2011 American Society of Civil Engineers.
History
Received: Dec 2, 2009
Accepted: Dec 17, 2010
Published online: Dec 20, 2010
Published in print: Oct 1, 2011
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