Mathematical Modeling and Experimental Verification of Stationary Waterjet Cleaning Process

Leu, Ming-Chuan; Meng, Ping; Geskin, E. S.; Tismeneskiy, L.

doi:10.1115/1.2830161

Cited by 77 publications

(48 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…So, Adler [2] studying the mechanisms that appear when a water jet hit a surface. Other works have studied the pressure variation in water jets such as Leach et al [3], Leu et al [4] and Guha et al [5].…”

Section: Introductionmentioning

confidence: 99%

Full Factorial DOE to determine and optimize the equation of impact forces produced by water jet used in sewer cleaning

2017

View full text Add to dashboard Cite

Abstract. The functioning of the equipment to cleaning sewer is dependent on certain process parameters, causing variations of the impact forces. The aim of this paper is to define and optimise an equation that determines the impact forces, forces produced when the water jets is used to clean the sewer. The research method to measure the impact forces is the experiment using full factorial design of experiment. To can made the experiments was used a stand to generate the pressure waterjets and a device to measurement the values of impact forces. In the first part of paper was determine the equation of impact forces produced by water jet and then was realised a multiple linear regression model in three different ways to optimise the prediction of the proposed equation.

show abstract

Section: Introductionmentioning

confidence: 99%

Full Factorial DOE to determine and optimize the equation of impact forces produced by water jet used in sewer cleaning

2017

View full text Add to dashboard Cite

show abstract

“…Leu et al, established a mathematical model of significant importance for cleaning operations, highlighting that cleaning occurs when the shear stress generated by water droplets impact is greater or equal to the endurance limit of the coating material. This study established that the maximum cleaning width is linearly proportional to the critical standoff distance, and optimal cleaning occurs at 0.576x c [1].…”

Section: Introductionmentioning

confidence: 99%

“…The main difference is that the cutting water jet requires jet penetration into the solid surface, whereas the water-jet for cleaning purposes does not require jet penetration into the solid, but does involve an erosion process by which soils are removed from the surface [1]. The cutting process has been analysed from an analytical and experimental point of view to evaluate the hydrodynamic forces and the optimal standoff distance [2,3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A numerical study on high-pressure water-spray cleaning for CSP reflectors

Anglani¹,

Barry²,

Dekkers³

2016

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Mirror cleaning for concentrated solar thermal (CST) systems is an important aspect of operation and maintenance (O&M), which affects solar field efficiency. The cleaning process involves soil removal by erosion, resulting from droplet impingement on the surface. Several studies have been conducted on dust accumulation and CSP plant reflectivity restoration, demonstrating that parameters such as nozzle diameter, jet impingement angle, interaxial distance between nozzles, standoff distance, water velocity, nozzle pressure and others factors influence the extent of reflectance restoration . In this paper we aim at identifying optimized cleaning strategies suitable for CST plants, able to restore mirror reflectance by high-pressure water-spray systems through the enhancement of shear stress over reflectors' surface. In order to evaluate the forces generated by water-spray jet impingement during the cleaning process, fluid dynamics simulations have been undertaken with ANSYS CFX software. In this analysis, shear forces represent the "critical phenomena" within the soil removal process. Enhancing shear forces on a particular area of the target surface, varying the angle of impingement in combination with the variation of standoff distances, and managing the interaxial distance of nozzles can increase cleaning efficiency. This procedure intends to improve the cleaning operation for CST mirrors reducing spotted surface and increasing particles removal efficiency. However, turbulence developed by adjacent flows decrease the shear stress generated on the reflectors surface. The presence of turbulence is identified by the formation of "fountain regions" which are mostly responsible of cleaning inefficiency. By numerical analysis using ANSYS CFX, we have modelled a stationary water-spray system with an array of three nozzles in line, with two angles of impingement: θ = 90° and θ = 75°. Several numerical tests have been carried out, varying the interaxial distance of nozzles, standoff distance, jet pressure and jet impingement angle in order to identify effective and efficient cleaning procedures to restore collectors' reflectance, decrease turbulence and improve CST plant efficiency. Results show that the forces generated over the flat target surface are proportional to the inlet pressure and to the water velocity over the surface, and that the shear stresses decrease as the standoff distance increases.

show abstract

“…Adler [1] describes mechanisms occurring at the impact of a jet with a surface. Leach et al [2], Leu et al [3] and Guha et al [4] analysed pressure distribution along the centreline of the water jet. A number of papers have studied the influence of nozzle geometry on water jet [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Full factorial DOE to determine the influence of the process parameters in cleaning water jets used in sewer cleaning

2017

View full text Add to dashboard Cite

Abstract. Industrial cleaning is a classic application of water jets technology. In the late 1950s, when reliable high pressure pumps were built, the usage of water jets spread widely in the field of pipes and sewerage cleaning. In our particular case, water jets using pressure between 100 and 200 bars are being used. The operational behaviour of these systems is dependent on the process parameters, which can vary, causing variations in the impact force. The experiment consists in the research method used in the study of the impact forces that occur in the sewerage cleaning head system. To determine the influence process parameters have on impact forces, the full factorial method was used. In order to measure the impact forces between the water jet and a flat and rigid surface, a stand was designed and built for generating pressure water jets, as well as a device to measure the impact forces.

show abstract

Mathematical Modeling and Experimental Verification of Stationary Waterjet Cleaning Process

Cited by 77 publications

References 6 publications

Full Factorial DOE to determine and optimize the equation of impact forces produced by water jet used in sewer cleaning

Full Factorial DOE to determine and optimize the equation of impact forces produced by water jet used in sewer cleaning

A numerical study on high-pressure water-spray cleaning for CSP reflectors

Full factorial DOE to determine the influence of the process parameters in cleaning water jets used in sewer cleaning

Contact Info

Product

Resources

About