Gas desorption from warm and cold seawater under open-cycle ocean thermal energy conversion (OC-OTEC) conditions is addressed in this paper. The desorption process of dissolved O2, N2, and CO2 in the barometric upcomers of an OTEC plant is simulated mathematically. The model considers the growth of bubbles originating in the ocean and bubbles formed in the upcomers. Bubble growth is induced by gas mass transfer and water evaporation at the bubble-liquid interface, as well as by the decreasing hydrostatic pressure. Heterogeneous nucleation at pipe wall crevices and on suspended particles in the water stream is also modeled. Bubble coalescence due to turbulent shear and differential buoyancy is simulated. The results generated show the deaeration efficiency as a function of flow and geometric parameters. The calculations show that gas desorption in the barometric upcomers can be appreciable. Such desorption is enhanced by increasing the concentration of the incoming and/or the heterogeneously formed bubbles. Results of existing experiments are discussed and predictions are shown for the selected test conditions.
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August 1990
Research Papers
Gas Desorption From Seawater in Open-Cycle Ocean Thermal Energy Conversion Barometric Upcomers
S. M. Ghiaasiaan,
S. M. Ghiaasiaan
Science Applications International Corporation, Torrance, CA
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A. T. Wassel,
A. T. Wassel
Science Applications International Corporation, Torrance, CA
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A. A. Pesaran
A. A. Pesaran
Solar Energy Research Institute, Golden, CO
Search for other works by this author on:
S. M. Ghiaasiaan
Science Applications International Corporation, Torrance, CA
A. T. Wassel
Science Applications International Corporation, Torrance, CA
A. A. Pesaran
Solar Energy Research Institute, Golden, CO
J. Sol. Energy Eng. Aug 1990, 112(3): 204-215 (12 pages)
Published Online: August 1, 1990
Article history
Received:
November 30, 1987
Revised:
February 7, 1990
Online:
June 6, 2008
Citation
Ghiaasiaan, S. M., Wassel, A. T., and Pesaran, A. A. (August 1, 1990). "Gas Desorption From Seawater in Open-Cycle Ocean Thermal Energy Conversion Barometric Upcomers." ASME. J. Sol. Energy Eng. August 1990; 112(3): 204–215. https://doi.org/10.1115/1.2930481
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