Abstract High‐pressure water jets are used to cut and drill into rocks by generating cavitating bubbles in the jet which collapse on surface of rock target material. The dynamics submerged depends strongly surrounding pressure, temperature liquid tension. Rayleigh–Plesset (RF) equation governs dynamic growth a bubble under various pressure conditions. A numerical finite difference model is established for simulating process growth, rebound cavitation travelling along flow through nozzle...

Sugar price forecasting has attracted extensive attention from policymakers due to its significant impact on people’s daily lives and markets. In this paper, we present a novel hybrid deep learning model that utilizes the merit of time series decomposition technology empirical mode (EMD) hyperparameter optimization algorithm Tree Parzen Estimators (TPEs) for sugar forecasting. The effectiveness proposed was implemented in case study with London Futures. Two experiments are conducted verify...

This paper describes a recent study on using fly ash for backfilling abandoned room and pillar mines. Detailed investigations properties such as the strength stiffness of settled ash, flowability grout, well chemistry environmental aspects backfill have been undertaken in laboratory. Numerical modelling was also conducted to quantify effects stability underground pillars. The laboratory tests showed that with solid concentration approximate 50%, grout has an excellent very low viscosity. It...

Computational fluid dynamics (CFD) simulation is an effective approach to develop and optimise gas drainage design for underground longwall coal mining. As part of the project supported by Australian Government Coal Mining Abatement Technology Support Package (CMATSP), three-dimensional CFD simulations were conducted test a conceptual which proposes using horizontal boreholes replace vertical at mine in Australia. Drainage performance between borehole was first carried out compare their...

Backfilling and injection of granular materials into mining induced voids, separated beddings, cracks, as either diluted slurry or concrete paste, is widely used to control coal mine subsidence. As a viable environmental solution, waste rejected from underground seams are in both backfilling operations. During longwall mining, the grout pumped beds fractured rock mass through pipeline connected central vertical borehole, which drilled deep interburden strata above seam. Either dilute thick...

The dynamics of stress, deformation and pore pressure in the surrounding strata underground mines are fundamental importance to groundwater gas emission management. Compared numerous studies on overlying strata, there significantly fewer investigations concerning underlying particularly involving large-scale field monitoring. This paper presents a comprehensive monitoring study conducted at two longwall panels with depth around 800 m an inclination angle 21°. program focused floor within 50...

Abstract Crystal size distribution (CSD) is important in evaluating crystal quality cane sugar crystallization process. Due to the complex non‐linearity, time‐delay and strong coupling process, it difficult directly modeling mechanism of process obtain CSD parameters. In order two main parameters so that achieve better control production sugar, this article constructs a data‐driven model based on least squares support vector regression (LSSVR) particle swarm optimization (PSO). Based LSSVR,...

Abstract Clarification of sugarcane juice is an important operation in the production process sugar industry. The gravity purity and color value are two most evaluation indexes cane using sulphitation clarification method. However, actual operation, measurement these usually obtained by offline experimental titration, which makes it impossible to timely adjust system indicators. A data‐driven modeling based on kernel extreme learning machine proposed predict clear juice. model parameters...

The variable nature of the coalmine roof poses a challenge to roadway stability during underground coal mining. There have been fatalities and financial losses in mining industry due failures falls. Generally, geotechnical geological data gathered from exploration boreholes, which are drilled at considerable distances each other, used characterize thickness quality (including strength) roof. This process provides limited number samples that cannot represent discontinuous strata nor can they...

Abstract Ultrasonic irradiation approach has become one of the most popular methods applied in chemical processing including lignocellulosic biomass pretreatment and industrial cleansing. The phenomenon ultrasonic cavitation can be indeed delineated via Rayleigh-Plesset equation (RPE), which governs transient radius bubble. Nonetheless, time marching numerical solutions for RPE is highly unstable, cannot assured using von Neumann analysis. High sensitivity to step may lead extremely long...

In order to assess the performance of a vehicle in conceptual design stage, square box model was proposed predict torsional stiffness and first-order frequency Body-in-White. The structure Body-in-White decomposed into eight simple structural surfaces, from which constructed. Based on finite element method, modified shear each surface calculated obtained. Then, surfaces were constructed an degree-of-freedom series spring system calculate frequency. Furthermore, multiobjective genetic...

Abstract The process of sugar evaporative crystallization is a nonlinear with large time lag and strong coupling. It difficult to establish reasonable mechanism model. In this paper, we use the data driving modeling method an Adaptive Control model for batch boiling process. First, by analyzing main influencing factors intermittent sugar, most important two parameters, brix liquid level, are selected as control object. self-adaptive differential evolution Extreme Learning Machine (SaDE-ELM)...

The shear stress generated in mine backfill slurries and fresh concrete contains both velocity gradient dependent frictional terms, categorised as viscous plastic fluids. This paper discusses application of the developed analytical solution for flow rate a function pressure discs, pipes cones such Bingham-Herschel-Bulkley this continuum fluid model to industrial materials like mineral slurries, backfills tests.