Volume 49

Parametric Study of Soot Particle Deposition and Heat Transfer Properties of Exhaust Heat Exchange Tube Bundles Yuanxun Ding , Hua Tian, Gequn Shu, Hongfei Zhang, Ping Yuan, Jiabao Chen

Abstract

Exhaust heat exchangers play a crucial role in the waste heat recovery from internal combustion engines, yet their performance is often compromised by soot particle deposition. In this paper, a new particle deposition prediction model based on the Lagrange method is proposed, which considers thermophoresis force, drag force, and wall shear removal. Based on this model, how different tube bundle arrangements and tube geometries affect soot deposition and the thermal hydraulic performance of heat exchanger tube bundles were studied. Results indicate that increasing the transverse spacing between tubes reduces the soot deposition while increasing the longitudinal spacing has the opposite effect. Additionally, increasing the ellipticity of the heat exchange tubes lowers the fouling thermal resistance but at the cost of reduced heat transfer efficiency. We identified that a staggered tube bundle with a tube ellipticity of 0.8 and a transverse spacing of 16mm provides optimal performance without sacrificing heat transfer capacity.

Keywords Exhaust heat exchanger, Soot particle deposition, Prediction model, Tube bundle arrangement, Thermal hydraulic performance