Simulations of thermophoretic deposition in wavy channels

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

Strebel, Kirk A. ; Vanka ; Surya Pratap

关键词: Thermophoresis;    Wavy Channels;    Computational fluid dynamics (CFD);    EGR Cooler;    Exhaust Gas Recirculation (EGR);   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/16495/1_Strebel_Kirk.pdf?sequence=2&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

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