Simulations of thermophoretic deposition in wavy channels

Strebel, Kirk A.

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https://hdl.handle.net/2142/16495 Copy

Description

Title

Simulations of thermophoretic deposition in wavy channels

Author(s)

Strebel, Kirk A.

Issue Date

2010-06-22T19:46:39Z

Director of Research (if dissertation) or Advisor (if thesis)

Vanka, Surya Pratap

Department of Study

Mechanical Sci & Engineering

Discipline

Mechanical Engineering

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• Thermophoresis
• Wavy Channels
• Computational fluid dynamics (CFD)
• EGR Cooler
• Exhaust Gas Recirculation (EGR)

Abstract

The use of exhaust gas recirculation coolers is important for minimization of harmful NOx emissions from large diesel engines. But the use of the soot filled exhaust leads to the deposition of particles on the fins of the EGR cooler. So it is important to understand the soot deposition mechanisms and geometry effects in order to design an efficient fin geometry that minimizes soot deposition. This study developed a fully implicit code with variable property consideration and boundary fitter coordinates to model the fluid flow, heat transfer, and soot deposition in wavy channels. The code was then used to study laminar and turbulent flow with Reynolds numbers ranging from 300 to 10,000. The inlet fluid temperature was held at 750 K and the wall temperature was varied from 300 K to 750 K. The first set of results is for laminar flow in a wavy channel. Three Reynolds numbers and four wall temperatures were studied for a single wavy geometry. The pressure drop, heat transfer, and soot deposition were predicted for all cases and trends are described. Then the effect of geometry on the pressure drop, heat transfer, and soot deposition in a laminar flow is studied. This is done by comparing the wavy channel results with planar channel results for one Reynolds number and three different wall temperatures. The second set of results is for turbulent flow in a wavy channel. Once again three Reynolds numbers and four wall temperatures were studied. Trends for the pressure drop, heat transfer, and soot deposition are described. Then once again the wavy channel results are compared with planar channel results to illustrate the effect of geometry.

Graduation Semester

2010-5

Permalink

http://hdl.handle.net/2142/16495

Copyright and License Information

Copyright 2010 Kirk A. Strebel

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