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Title: Mist lift analysis summary report

The mist flow open-cycle OTEC concept proposed by S.L. Ridgway has much promise, but the fluid mechanics of the mist flow are not well understood. The creation of the mist and the possibility of droplet growth leading to rainout (when the vapor can no longer support the mist) are particularly troublesome. This report summarizes preliminary results of a numerical analysis initiated at SERI in FY79 to study the mist-lift process. The analysis emphasizes the mass transfer and fluid mechanics of the steady-state mist flow and is based on one-dimensional models of the mist flow developed for SERI by Graham Wallis. One of Wallis's models describes a mist composed of a single size of drops and another considers several drop sizes. The latter model, further developed at SERI, considers a changing spectrum of discrete drop sizes and incorporates the mathematics describing collisions and growth of the droplets by coalescence. The analysis results show that under conditions leading to maximum lift in the single-drop-size model, the multigroup model predicts significantly reduced lift because of the growth of droplets by coalescence. The predicted lift height is sensitive to variations in the mass flow rate and inlet pressure. Inclusion of a coasting section, inmore » which the drops would rise ballistically without change in temperature, may lead to increased lift within the existing range of operation.« less
Authors:
Publication Date:
OSTI Identifier:
5112474
Report Number(s):
SERI/TR-631-627
DOE Contract Number:
AC02-77CH00178
Resource Type:
Technical Report
Research Org:
Solar Energy Research Inst., Golden, CO (USA)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; MIST-LIFT CYCLES; MATHEMATICAL MODELS; OCEAN THERMAL ENERGY CONVERSION; ANALYTICAL SOLUTION; COMPUTER CODES; DROPLETS; FLUID MECHANICS; HEIGHT; MASS TRANSFER; NUMERICAL ANALYSIS; NUMERICAL SOLUTION; OCEAN THERMAL POWER PLANTS; OPEN-CYCLE SYSTEMS; PARTICLE SIZE; CONVERSION; DIMENSIONS; ENERGY CONVERSION; LIFT CYCLES; MATHEMATICS; MECHANICS; PARTICLES; POWER PLANTS; SIZE; SOLAR ENERGY CONVERSION; SOLAR POWER PLANTS; THERMAL POWER PLANTS; THERMODYNAMIC CYCLES 140800* -- Solar Energy-- Ocean Energy Systems