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Title: An investigation of vapor concentration during boiling of liquid mixtures

The objective of the study is to clarify experimentally the variation of the vapor concentration of binary mixture generated during nucleate boiling in a saturated pool under various boiling conditions. The generated vapor concentrations in the bulk vapor layer were measured for the binary mixtures of water-ethanol and ethanol-acetone under various liquid concentrations, the heat fluxes and the liquid layer heights from the heated thin wires at the atmospheric pressure. The main experimental apparatus for measuring concentration of bulk vapor in the boiling and condensation system is shown. Two methods of measuring concentration, i.e., the dew point method and the laser absorption method were adopted. The dew point measurement was carried out by utilizing the copper heat transfer block installed in the central part of the vapor layer in the vessel. The commencement of the condensation was observed directly for determining the dew point by controlling its temperature. The laser light having wavelength of 3.39 micron meters was used for the laser light absorption method utilizing its absorptive property against ethanol vapor. The measured results by using both methods coincided well with each other. The measured concentrations of the bulk vapor for various superheatings of heated wires, the depth ofmore » liquid mixture layer and liquid concentrations were almost independent of those parameters and were almost in equilibrium with bulk liquid conditions even under the higher surface superheating and the lower liquid heights.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
20030460
Resource Type:
Conference
Resource Relation:
Conference: 5th ASME/JSME Thermal Engineering Joint Conference, San Diego, CA (US), 03/14/1999--03/19/1999; Other Information: 1 CD-ROM. Operating system required: Windows i386(tm), i486(tm), Pentium (R) or Pentium Pro, MS Windows 3.1, 95, or NT 3.51, 8 MB RAM, MacIntosh and Power MacIntosh with a 68020 or greater processor, System software version 7.1, 3.5 MB RAM (5 MB for PowerMac) 6 MB available hard-disk space, Unix; PBD: 1999; Related Information: In: Proceedings of the 5th ASME/JSME thermal engineering joint conference, [3600] pages.
Publisher:
American Society of Mechanical Engineers, New York, NY (US)
Research Org:
Yokohama National Univ., Tokiwadai (JP)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; WORKING FLUIDS; ENERGY EFFICIENCY; BINARY MIXTURES; NUCLEATE BOILING; HEAT FLUX; VOID FRACTION; ETHANOL; ACETONE; WATER; TUBES