Experimental confirmation of the insensitivity of mass diffusion measurements to blockages and voids along the diffusion path
Identifieur interne : 011A47 ( Main/Repository ); précédent : 011A46; suivant : 011A48Experimental confirmation of the insensitivity of mass diffusion measurements to blockages and voids along the diffusion path
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Abstract
Using the real-time diffusion methodology first developed by Codastefano [Rev. Sci. Instrum. 48, 1650 (1977)] we show that deviations from strictly one-dimensional transport (i.e., blockages and voids) widely cited in the literature as leading to erroneous results, have little effect on the measured diffusivity. In this methodology, radiotracer, initially located at one end of a cylindrical diffusion sample, is used as the diffusant. The sample is positioned in a concentric isothermal radiation shield with collimation bores located at defined positions along its axis. The intensity of the radiation emitted through the collimators is measured as a function of time using solid state detectors. Diffusivities are calculated from the signal difference between the detectors. These results were obtained using 114mIn radiotracer in benign indium. A 60% blockage was simulated by using a 2 mm source disk diffusing into 3 mm diameter host section. A void/bubble was simulated by inserting a 1 mm diameter by 1 mm long side plug into the sample 7 mm from the top (radiotracer section). The resulting self-diffusivities obtained were, for both modifications, comparable with other ground experiments. These results agree with numerical simulations. An analytical model describing the minimal effects of blockages and voids on the output diffusivity is presented. © 2000 American Institute of Physics.
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Michael Banish</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville, Alabama 35899</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Alabama</region></placeName><wicri:cityArea>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville</wicri:cityArea></affiliation><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Department of Aerospace and Mechanical Engineering, Case Western Reserve University, Cleveland, Ohio</s1></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Ohio</region></placeName><wicri:cityArea>Department of Aerospace and Mechanical Engineering, Case Western Reserve University, Cleveland</wicri:cityArea></affiliation><affiliation wicri:level="2"><inist:fA14 i1="03"><s1>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville, Alabama 35899</s1></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Alabama</region></placeName><wicri:cityArea>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville</wicri:cityArea></affiliation></author><author><name sortKey="Alexander, J Iwan D" uniqKey="Alexander J">J. Iwan D. Alexander</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville, Alabama 35899</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Alabama</region></placeName><wicri:cityArea>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville</wicri:cityArea></affiliation></author><author><name sortKey="Jalbert, Lyle B" uniqKey="Jalbert L">Lyle B. Jalbert</name><affiliation wicri:level="2"><inist:fA14 i1="01"><s1>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville, Alabama 35899</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country xml:lang="fr">États-Unis</country><placeName><region type="state">Alabama</region></placeName><wicri:cityArea>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville</wicri:cityArea></affiliation></author></titleStmt><publicationStmt><idno type="inist">00-0528564</idno><date when="2000-12">2000-12</date><idno type="stanalyst">PASCAL 00-0528564 AIP</idno><idno type="RBID">Pascal:00-0528564</idno><idno type="wicri:Area/Main/Corpus">012111</idno><idno type="wicri:Area/Main/Repository">011A47</idno></publicationStmt><seriesStmt><idno type="ISSN">0034-6748</idno><title level="j" type="abbreviated">Rev. sci. instrum.</title><title level="j" type="main">Review of scientific instruments</title></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Convection</term><term>Diffusion</term><term>Experimental study</term><term>Instrumentation</term><term>Mass transfer</term><term>Measuring methods</term><term>Radioactive tracers</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>0790</term><term>6610C</term><term>Etude expérimentale</term><term>Appareillage</term><term>Méthode mesure</term><term>Traceur radioactif</term><term>Diffusion(transport)</term><term>Convection</term><term>Transfert masse</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Using the real-time diffusion methodology first developed by Codastefano [Rev. Sci. Instrum. 48, 1650 (1977)] we show that deviations from strictly one-dimensional transport (i.e., blockages and voids) widely cited in the literature as leading to erroneous results, have little effect on the measured diffusivity. In this methodology, radiotracer, initially located at one end of a cylindrical diffusion sample, is used as the diffusant. The sample is positioned in a concentric isothermal radiation shield with collimation bores located at defined positions along its axis. The intensity of the radiation emitted through the collimators is measured as a function of time using solid state detectors. Diffusivities are calculated from the signal difference between the detectors. These results were obtained using <sup>114m</sup>In radiotracer in benign indium. A 60% blockage was simulated by using a 2 mm source disk diffusing into 3 mm diameter host section. A void/bubble was simulated by inserting a 1 mm diameter by 1 mm long side plug into the sample 7 mm from the top (radiotracer section). The resulting self-diffusivities obtained were, for both modifications, comparable with other ground experiments. These results agree with numerical simulations. An analytical model describing the minimal effects of blockages and voids on the output diffusivity is presented. © 2000 American Institute of Physics.</div> </front></TEI><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0034-6748</s0></fA01><fA02 i1="01"><s0>RSINAK</s0></fA02><fA03 i2="1"><s0>Rev. sci. instrum.</s0></fA03><fA05><s2>71</s2></fA05><fA06><s2>12</s2></fA06><fA08 i1="01" i2="1" l="ENG"><s1>Experimental confirmation of the insensitivity of mass diffusion measurements to blockages and voids along the diffusion path</s1></fA08><fA11 i1="01" i2="1"><s1>BANISH (R. Michael)</s1></fA11><fA11 i1="02" i2="1"><s1>ALEXANDER (J. Iwan D.)</s1></fA11><fA11 i1="03" i2="1"><s1>JALBERT (Lyle B.)</s1></fA11><fA14 i1="01"><s1>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville, Alabama 35899</s1><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></fA14><fA14 i1="02"><s1>Department of Aerospace and Mechanical Engineering, Case Western Reserve University, Cleveland, Ohio</s1></fA14><fA14 i1="03"><s1>Center for Microgravity and Materials Research, University of Alabama in Huntsville, Huntsville, Alabama 35899</s1></fA14><fA20><s1>4497-4501</s1></fA20><fA21><s1>2000-12</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>151</s2></fA43><fA44><s0>8100</s0><s1>© 2000 American Institute of Physics. All rights reserved.</s1></fA44><fA47 i1="01" i2="1"><s0>00-0528564</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Review of scientific instruments</s0></fA64><fA66 i1="01"><s0>USA</s0></fA66><fC01 i1="01" l="ENG"><s0>Using the real-time diffusion methodology first developed by Codastefano [Rev. Sci. Instrum. 48, 1650 (1977)] we show that deviations from strictly one-dimensional transport (i.e., blockages and voids) widely cited in the literature as leading to erroneous results, have little effect on the measured diffusivity. In this methodology, radiotracer, initially located at one end of a cylindrical diffusion sample, is used as the diffusant. The sample is positioned in a concentric isothermal radiation shield with collimation bores located at defined positions along its axis. The intensity of the radiation emitted through the collimators is measured as a function of time using solid state detectors. Diffusivities are calculated from the signal difference between the detectors. These results were obtained using <sup>114m</sup>In radiotracer in benign indium. A 60% blockage was simulated by using a 2 mm source disk diffusing into 3 mm diameter host section. A void/bubble was simulated by inserting a 1 mm diameter by 1 mm long side plug into the sample 7 mm from the top (radiotracer section). The resulting self-diffusivities obtained were, for both modifications, comparable with other ground experiments. These results agree with numerical simulations. 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