October 7, 2024 Dataset Restricted Access

Singh, Digvijay; Boden, Stephan; Schlegel, Fabian

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  <identifier identifierType="DOI">10.14278/rodare.4025</identifier>
  <creators>
    <creator>
      <creatorName>Singh, Digvijay</creatorName>
      <givenName>Digvijay</givenName>
      <familyName>Singh</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-8930-5374</nameIdentifier>
      <affiliation>Helmholtz-Zentrum Dresden - Rossendorf .e.V</affiliation>
    </creator>
    <creator>
      <creatorName>Boden, Stephan</creatorName>
      <givenName>Stephan</givenName>
      <familyName>Boden</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0002-7170-078X</nameIdentifier>
      <affiliation>Helmholtz-Zentrum Dresden - Rossendorf e.V.</affiliation>
    </creator>
    <creator>
      <creatorName>Schlegel, Fabian</creatorName>
      <givenName>Fabian</givenName>
      <familyName>Schlegel</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0003-3824-9568</nameIdentifier>
      <affiliation>Helmholtz-Zentrum Dresden - Rossendorf e.V.</affiliation>
    </creator>
  </creators>
  <titles>
    <title>FVV1455: CFD Simulation of Droplet Separators</title>
  </titles>
  <publisher>Rodare</publisher>
  <publicationYear>2024</publicationYear>
  <subjects>
    <subject>Numerical Simulation</subject>
    <subject>Droplets</subject>
    <subject>Film Modeling</subject>
    <subject>Multiphase Flow</subject>
    <subject>Fuel Cell</subject>
    <subject>Separation</subject>
    <subject>Automotive</subject>
    <subject>Experiments</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2024-10-07</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Dataset"/>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://rodare.hzdr.de/record/4025</alternateIdentifier>
  </alternateIdentifiers>
  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsIdenticalTo">https://www.hzdr.de/publications/Publ-37650</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsVersionOf">10.14278/rodare.2506</relatedIdentifier>
    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://rodare.hzdr.de/communities/rodare</relatedIdentifier>
  </relatedIdentifiers>
  <version>5.0.0</version>
  <rightsList>
    <rights rightsURI="info:eu-repo/semantics/restrictedAccess">Restricted Access</rights>
  </rightsList>
  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;For industrial applications, the two-fluid model is preferred due to its&amp;nbsp;&lt;br&gt;
efficient modelling of small-scale interfaces. Whereas, a thin film model,&amp;nbsp;&lt;br&gt;
based on a long wave approximation, is used for the unresolved interfaces to&amp;nbsp;&lt;br&gt;
obtain the film features by solving the 2D Navier-Stokes equations for wall&amp;nbsp;&lt;br&gt;
films. Within the project, the target is to develop an experimentally validated&amp;nbsp;&lt;br&gt;
3D-CFD model to investigate the separation efficiency of droplet separators for&amp;nbsp;&lt;br&gt;
fuel cell systems. A hybrid model is developed, which couples the two-fluid&amp;nbsp;&lt;br&gt;
model with a thin film model via mass transfer terms for droplet deposition,&amp;nbsp;&lt;br&gt;
droplet entrainment and film separation. A two-way coupling between droplets&amp;nbsp;&lt;br&gt;
and the thin film is established using mass and momentum source terms, derived&amp;nbsp;&lt;br&gt;
analytical and from available experiments. The droplet separator is an essential&amp;nbsp;&lt;br&gt;
component of an automotive fuel cell system that segregates a significant amount&amp;nbsp;&lt;br&gt;
of liquid fractions from the air-water mixture. The flow dynamics inside a&amp;nbsp;&lt;br&gt;
droplet separator consist of a dispersed gas and liquid with a wall adhered&amp;nbsp;&lt;br&gt;
thin liquid film. The modelling is divided into the following stages due to the&amp;nbsp;&lt;br&gt;
complex fluidic phenomenon inside a generic droplet separator:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Droplet deposition model,&lt;/li&gt;
	&lt;li&gt;Film separation model,&lt;/li&gt;
	&lt;li&gt;Film transition model, and&lt;/li&gt;
	&lt;li&gt;Population balance model.&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;In order to systematically validate numerical models and methods that predict&amp;nbsp;&lt;br&gt;
the characteristics of films and the separation efficiencies of droplet&amp;nbsp;&lt;br&gt;
separators, high-quality experimental data must be carefully acquired. For the&amp;nbsp;&lt;br&gt;
experimental investigations an air-water two-phase flow loop was set up. The&amp;nbsp;&lt;br&gt;
flow loop is extensively instrumented in order to provide precise data on the&amp;nbsp;&lt;br&gt;
respective operating conditions such as mass low and pressure drop. The&amp;nbsp;&lt;br&gt;
following advanced measurement techniques have been applied:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;HZDR&amp;#39;s flow microscope to investigate droplet flow,&lt;/li&gt;
	&lt;li&gt;HZDR&amp;#39;s advanced microfocus X-ray tomograph to visualize the liquid films, and&lt;/li&gt;
	&lt;li&gt;radioscopic imaging to investigate dynamic flow processes.&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;The generic droplet separator was extensively tested under varying operating&amp;nbsp;&lt;br&gt;
conditions at a total of 27 measurement points covering a wide range of mostly&amp;nbsp;&lt;br&gt;
wavy and annular inlet flow conditions. The resulting comprehensive set of&amp;nbsp;&lt;br&gt;
experimental data provides an excellent basis for the development and validation&lt;br&gt;
of numerical design tools required by the industry.&lt;/p&gt;</description>
    <description descriptionType="Other">The research project was self-financed (FVV funding no. 1455) by the FVV e.V.</description>
  </descriptions>
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