October 7, 2024 Dataset Restricted Access

Singh, Digvijay; Boden, Stephan; Schlegel, Fabian

MARC21 XML Export

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    <subfield code="a">https://www.hzdr.de/publications/Publ-37650</subfield>
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    <subfield code="c">2024-10-07</subfield>
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    <subfield code="a">The research project was self-financed (FVV funding no. 1455) by the FVV e.V.</subfield>
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    <subfield code="a">Singh, Digvijay</subfield>
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    <subfield code="a">&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;</subfield>
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    <subfield code="a">Numerical Simulation</subfield>
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  <datafield tag="653" ind1=" " ind2=" ">
    <subfield code="a">Droplets</subfield>
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    <subfield code="a">Film Modeling</subfield>
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    <subfield code="a">Multiphase Flow</subfield>
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    <subfield code="a">Fuel Cell</subfield>
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    <subfield code="a">Separation</subfield>
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    <subfield code="a">Automotive</subfield>
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    <subfield code="a">Experiments</subfield>
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    <subfield code="a">FVV1455: CFD Simulation of Droplet Separators</subfield>
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    <subfield code="a">Boden, Stephan</subfield>
    <subfield code="u">Helmholtz-Zentrum Dresden - Rossendorf e.V.</subfield>
    <subfield code="0">(orcid)0000-0002-7170-078X</subfield>
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    <subfield code="a">Schlegel, Fabian</subfield>
    <subfield code="u">Helmholtz-Zentrum Dresden - Rossendorf e.V.</subfield>
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    <subfield code="a">Schlottke, Jan</subfield>
    <subfield code="u">MAHLE International GmbH</subfield>
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    <subfield code="a">Weber, Andreas</subfield>
    <subfield code="u">MANN+HUMMEL GmbH</subfield>
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