Numerical Simulation and Experimental Study on Erosion-corrosion of Square Elbow Based on Orthogonal Test

doi:10.11902/1005.4537.2021.325

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (6): 979-987 DOI: 10.11902/1005.4537.2021.325

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Numerical Simulation and Experimental Study on Erosion-corrosion of Square Elbow Based on Orthogonal Test

YANG Xiangyu¹, GUAN Lei¹(

), LI Yu², ZHANG Yongkang¹, WANG Guan¹, YAN Dejun²

1. Guangzhou Key Laboratory of Nontraditional Machining and Equipment, State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China
2. Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships, CSSC Huangpu Wenchong Shipbuilding Company Limited, Guangzhou 510715, China

Cite this article:

YANG Xiangyu, GUAN Lei, LI Yu, ZHANG Yongkang, WANG Guan, YAN Dejun. Numerical Simulation and Experimental Study on Erosion-corrosion of Square Elbow Based on Orthogonal Test. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 979-987.

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Abstract

Marine seawater pipeline and various fittings play an important role in cooling and firefighting, among which square elbow is widely used. However, it is found from daily maintenance that the square elbow is also the part mostly prone to leakage. In this paper, the effect of related parameters for pipe, such as diameter (A), inlet velocity (B), liquid flow direction (C), sand diameter (D) and sand mass flow (E) on the erosion-corrosion behavior of square elbow in the condition of liquid-solid two-phase flow was studied by means of orthogonal test and numerical simulation. The results show that the order of influence of different factors on erosion-corrosion of square elbow may be ranked as: B>A>E>C>D. The erosion rate of the square elbow reaches the maximum in case that B is 5 m/s, A is 30 mm, E is 0.03 kg/s, C is the flow direction horizontal and vertical upward, and D is 500 μm respectively. The area with large erosion rate is concentrated in the range between 60° and 90° of the axial angle of the elbow, whilst near 180° of the radial angle, i.e., where located on the outside of the elbow near the exit. The experimental results also verify that the corrosion rate on the outside of the elbow near the exit is higher in this working condition. At the same time, the results of tests by factors of optimal level also show that reducing the inlet velocity and increasing the pipe diameter can greatly reduce the erosion rate.

Key words: erosion-corrosion orthogonal test numerical simulation 90° elbow corrosion rate

Received: 15 November 2021

ZTFLH:

TG174

Fund: Natural Science Foundation of Guangdong Province China(2021A1515010967);National Natural Science Foundation of China(52001074);Science and Technology Program of Guangzhou(202102020723);Science and Technology Program of Guangzhou(202102020626);China Postdoctoral Science Foundation(2020M682929)

About author: GUAN Lei, E-mail: lguan@gdut.edu.cn

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	Xiangyu YANG
	Lei GUAN
	Yu LI
	Yongkang ZHANG
	Guan WANG
	Dejun YAN

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.325 OR https://www.jcscp.org/EN/Y2022/V42/I6/979

Fig.1 Elbow model and flow direction: (a) horizontal to vertical down, (b) vertical up to horizontal, (c) vertical down to horizontal, (d) horizontal to vertical up

Fig.2 Relationship curves between the number of grids and the maximum erosion rate

Table 1 Factor level table

Fig.3 Tubular experimental device: 1. liquid storage tank (mixing device); 2. self priming screw pump (regulating flow); 3. test bend section

Fig.4 Arrangement of array electrodes in the elbow during erosion test

Table 2 Numerical simulation results based on orthogonal experiment

Fig.5 Factor-indicator trend graphs: (a) pipe diameter, (b) inlet velocity, (c) flow direction, (d) sand diameter, (e) sand mass flow

Fig.6 Erosion rate distribution cloud maps on x-y plane (a) and y-z plane (b)

Fig.7 Erosion rate distribution cloud maps on x-y plane (a) and y-z plane (b) in the erosion test under the optimal condition (B₁A₄E₁C₁D₁)

Fig.8 OCP vs. time curves of the electrodes 1-5 (a) and their polarization curves after 12 h experiment (b)

Table 3 OCP values of the electrodes 1-5 and fitting data of their polarization curves after 12 h experiment

Fig.9 Nyquist (a) and Bode (b) plots of the electrodes 1-5 after 12 h experiment and corresponding equivalent circuit diagram (c)

Table 4 Fitting results of electrochemical impedance spectra (the area of electrodes: 0.2826 cm²)

Fig.10 Erosion-corrosion morphologies of the electrodes 1 (a), 2 (b), 3 (c), 4 (d) and 5 (e)

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