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Using Rocky DEM to Understand Fouling of Heat Exchangers

Learn how engineers accurately simulated heat exchanger operation using Rocky DEM and ANSYS software integrated solutions

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A refrigerator’s heat exchanger plays a key role in dissipating heat, especially in high-end kitchen designs that appear compact and built-in. The component functions efficiently only when it robustly prevents dirt accumulation.

Until recently, accurately simulating heat exchanger operation was difficult due to limitations in realistically modeling particles, along with a resulting high computational cost. Discrete element modeling (DEM) now offers accurate particle physics, predicting behavior of non-spherical flexible fibers in a reasonable solve time. Incorporating CFD into the process yields information on deposition, turbulence dispersion and adhesion forces.

To validate analysis accuracy, Sub-Zero Group engineers performed wind-tunnel testing results to simulation, using Rocky DEM and ANSYS software to achieve an integrated DEM-CFD solution.

This presentation includes:

  • Refrigerator’s condenser heat exchanger role
  • Experimental wind-tunnel testing and results
  • DEM challenges and capabilities
  • Numerical modeling, including fiber modeling, CFD and DEM models, and integration details
  • Results

* This study was presented originally at the ANSYS Innovation Conference in September 2019 by Anderson Bortoletto, Principal Engineer, Sub-Zero Group Inc.

 


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