Numerical Study of the Solid Particle Erosion on H-Type Finned Circular/Elliptic Tube Surface

Abstract

In this paper, numerical simulations of solid particle erosion phenomena on H-type finned circular/elliptic tube surface, which is of great significance to the antiwear design of heat exchanger, are presented. The Eulerian-Lagrangian approach is applied to simulate the dilute gas-solid flow through H-type finned circular/elliptic tubes. A semi-empirical model is adopted to predict the erosion rate. The dynamics behavior of the entrained solid particles in the flow is presented. The geometry of eroded tube surface is changed with the predicted erosion which is taken into account by a UDF and the flow field is re-solved for the eroded tube surface at every time step. The influences of ten parameters (the tube bundle arrangement, particle size, particle concentration, fluid Reynolds number, fin thickness, fin pitch, fin length, fin width, slit width and the transverse tube pitch) on the maximum erosion depth of the H-type circular/elliptic finned tube surface are investigated. Using H-type finned elliptic tube surface can effectively reduce the erosion rate of tube surface comparedwith that using H-type finned circular tube surface. The erosion in in-line arrangement is less severe than that in staggered arrangement. With the increase of particle size, particle concentration and the fluid Reynolds number, the erosion rate of the tube surface rises. The numerically predicted effect of Reynolds number is in good agreement with previous test data. Among the six geometry parameters, the most influential parameter is the transverse tube pitch.

Gas-side fouling, erosion and corrosion of heat exchanger for middle and low temperature flue gas waste heat recovery

“…由于Tabakoff半经验模型 [30] 对于飞灰颗粒的磨 损量具有较好的预测能力并已得到广泛的应用 [35,36] , 故作者团队在研究换热器换热表面的磨损计算 [37] 时, 采用Tabakoff半经验公式 [30] .…”

“…Oka等人 [32,33] 90 1 2 Typical particle trajectories for different size particles around single row tube [37] . [37] .…”

“…Oka等人 [32,33] 90 1 2 Typical particle trajectories for different size particles around single row tube [37] . [37] . (a) 不同颗粒直径; (b) 不同颗粒流量; (c) 不同雷诺数 Figure 8 (Color online) Distribution of local penetration depth of tube surface [37] .…”

“…[37] . (a) 不同颗粒直径; (b) 不同颗粒流量; (c) 不同雷诺数 Figure 8 (Color online) Distribution of local penetration depth of tube surface [37] . 3.1 低温腐蚀机理分析 换热器表面低温腐蚀特性也是影响换热器运行 图 9 不同时刻管壁边界变化图 [37] .…”

“…(a) 不同颗粒直径; (b) 不同颗粒流量; (c) 不同雷诺数 Figure 8 (Color online) Distribution of local penetration depth of tube surface [37] . 3.1 低温腐蚀机理分析 换热器表面低温腐蚀特性也是影响换热器运行 图 9 不同时刻管壁边界变化图 [37] . d p =30 m, Re=11174 Figure 9 The deformation of tube surface at different operating time [37] .…”