Li et al 2020a - Revision history

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19871985: /* 1. Introduction */

2020-03-20T07:19:58Z

‎1. Introduction

19871985: /* Siphon pipe Parameter Optimization of the Toilet Using CFD-DEM Coupling Method */

2020-03-20T07:19:15Z

‎Siphon pipe Parameter Optimization of the Toilet Using CFD-DEM Coupling Method

19871985: 19871985 moved page Draft Li 649584643 to Li et al 2020a

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19871985 moved page Draft Li 649584643 to Li et al 2020a

19871985: Created page with " ==Siphon pipe Parameter Optimization of the Toilet Using CFD-DEM Coupling Method == Zhanfu Li^1,3,Xiaole Ge²,Kunyuan Li¹,Xin Tong^{1*
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Created page with " ==Siphon pipe Parameter Optimization of the Toilet Using CFD-DEM Coupling Method == Zhanfu Li1,3,Xiaole Ge2,Kunyuan Li1,Xin Tong1*</su..."
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−	~~=1. Introduction=~~
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−	Toilets are essential necessities in our daily life and water consumption of toilets is large among a variety of sanitary equipment [1]. The toilet flushing performance is an important index of quality assessment. And thus, constantly improving the flushing performance of the toilet has been the goal for researchers and workers in sanitary ware industry.
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−	So far, there are two main research methods for the toilet flushing performance: simulation research and experimental research. In simulation research, CFD method was widely used by most scholars to complete the simulation of the toilet flushing process, which can only consider water flow rule [2, 3]. In the experimental research, it is convenient for us to get a quantitative flushing effect, but it is not easy to get the complete flow field data [4-6]. In fact, the complex flushing process of toilet contains the interactions of flow-solids and solids-walls besides the movement process of water flow. All these factors have a certain impact on the flushing performance of the toilet. Therefore, the exploration of a new method considering the movement process of solids in the flushing process will be an important part in the study of the toilet flushing performance.
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−	In order to incorporate the movement process of solids into the flushing process of the toilet, it is necessary for us to seek a computational model to simulate the comprehensive fluid and solid systems. And the CFD-DEM coupling method right provides a computational method for the complex model. The basic idea is that the computational fluid dynamics is used to calculate the flow of fluid, and DEM is used to calculate the force and movement of particles. The advantage of the CFD-DEM coupling method is that it can not only really simulate the flow rule of flow field, but also can take the particles’ shapes, collision, movement path and adhesion of particles into account. More importantly, it has been applied widely in many fields such as geology, sands flow, drainage machinery and so on [7-9]. In this paper, the CFD-DEM coupling method is used to study and simulate the flushing process of the toilet. Further, we verify the simulation rule by physical simulation experiments. At the same time, the orthogonal test is used to study different structural parameters of siphon pipes. All these research contents can provide references for the flushing performance analysis of the toilet and the design of siphon pipes.

	=2. Theory=		=2. Theory=

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−	~~==Siphon pipe Parameter Optimization of the Toilet Using CFD-DEM Coupling Method ==~~
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−	~~Zhanfu Li<sup>1,3</sup>,Xiaole Ge<sup>2</sup>,Kunyuan Li<sup>1</sup>,Xin Tong<sup>1*</sup>~~
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−	~~(1.Mechanical Engineering training base, School of Mechanical and Automobile Engineering, Fujian University of Technology, Fuzhou, China,350118~~
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−	~~2. College of Mechanical and Electrical Engineering, Huangshan University, Huangshan,China,245041~~
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−	~~<span id='_GoBack'></span>3. CSCEC Strait Construction and Development Co., Ltd, Fuzhou, China,350118~~
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−	*Corresponding author: Email [mailto:addresses:Tongxin_hqu_fjut@163.com addresses:Tongxin_hqu_fjut@163.com], [mailto:19871985@fjut.edu.cn 19871985@fjut.edu.cn])
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−	<big>'''Abstract：'''</big>The computational fluid dynamics (CFD) and discrete element method (DEM) coupling method is used to simulate the flushing process of the toilet and this paper analyzes the influence of different structural parameters of siphon pipe on the flushing performance of the toilet. And through the adjusted-parameters toilet, tlushing experments were carried out to verify the simulations. Meanwhile the orthogonal test of different structural parameters of siphon pipes were conducted to study the flushing Performance. The research results show that the CFD-DEM coupling method can be used to study the regularity of the toilet flushing performance. The toilet can get the better flushing performance when the tilt angle of the angle of inclination is 50°, the curvature width and length are 50 mm and 220 mm, the width and height of the secondary water seal are 100 mm and 25 mm and pipe diameter is 53 mm. The method in this paper can provide a new idea for the study and design of the flushing performance of the toilet.
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−	~~'''Keyword:''' CFD-DEM, flushing performance, structural parameters, coupling method, adjusted-parameters toilet~~

	=1. Introduction=		=1. Introduction=

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