Search results

As the crucial support component of the propeller power system, the reliability of the operation of submersible pumps is influenced by the lubrication performance of water-lubricated thrust bearings. When the water-lubricated thrust bearings are under start-stop or heavy load conditions, the effect of surface morphology is crucial as the mixed lubrication regime is encountered. This paper aims to develop one mixed lubrication model for the water-lubricated thrust bearings to predict the effects of surface skewness, kurtosis and roughness orientation on the loading carrying capacity and tribological behavior.

This paper developed one improved mixed lubrication model specifically for the water-lubricated thrust bearing system. In this model, the hydrodynamic model was improved by using the height of the rough surface and its probability density function, combined with the average flow model. The asperity contact model was improved by using the equation for the Pearson system of frequency curves to characterize the non-Gaussian aspect of surface roughness distribution.

According to the results, negative skewness, large kurtosis and lateral surface pattern can improve the tribological performance of water-lubricated thrust bearings. Optimizing the surface morphology is a reasonable design method that can improve the performance of water-lubricated thrust bearings.

In this paper, one mixed lubrication model specifically for the water-lubricated thrust bearing with the effect of surface roughness into consideration was developed. Based on the developed model, the effect of surface morphology on tribological behavior can be evaluated.

The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-08-2023-0247/

The Japanese culture has many meanings and proverbs associated with the word “water.” “Water” could mean “clear,” “clean,” “beautiful,” and “life.” Water is valuable to people in that it is used for drinking, cooking, washing, and fishing. On the flip side, water is a cause of disaster. Thus, people use water for survival, as well as fight with water during disasters. Because of the many uses of water, people developed a rule for water utilization. This rule cultivated trust in the community. However, infrastructure development (e.g., water supply system, dikes, and road networks), the promotion of washing machines, and social advancement changed the role of the water area from just a flowing stream, which can be simply likened to a sewer, to an important component of infrastructure.

The northwestern China has been suffering from severe droughts. Water management has been considered of great importance throughout the history. For drought disaster reduction, water management technologies such as ridge planting, water conservancy projects, and Karez irrigation systems have been developed since ancient times. In this chapter, water cellar system is introduced as an example of indigenous knowledge for water management in Chinese rural communities.

The new campus of Tianjin University was designed, built and now operates following a green and sustainable concept. The campus’ eco-friendly water environment was formed by establishing a water recycling system. The campus is divided into three drainage sections based on the masterplan. Each drainage section adopts different methods of collecting, utilizing and discharging water according to specific conditions, aimed at achieving both high drainage capability and the efficient utilisation of rainwater. The campus was designed so runoff pollution is reduced through the utilisation of low-impact development methods, ensuring the quality of the recharge water. Through studying the fundamentals of treatment measures and models for simulating water quality, water circulation, constructed wetlands and pollution control of rain runoff, parameters for efficient water recycling could be mathematically forecast, ensuring that stakeholders can be continuously engaged in improving and preserving the water quality of landscaped water on campus. The overall system integrates a variety of measures being implemented into one cohesive entity, which contributes to establishing the sustainable and healthy water cycling system of the green campus.

Water is a very common word for every human and a very common element for every life on earth. But underneath a very common meaning, a critical element and path for life being and existence lay placidly. Through various interactions between human and water, the intrinsic perceptive meaning is developed and varied in different place and time. It can mean life or death, strength or weakness, rich or poor, peace or conflict, and rise or fall. And this perceptive intrinsic meaning can be captured in one mind or extended to or shared with many thoughts. Sharing or extending from one to many or from an individual to an assemblage represent the evolution and development in complexity of relationship or social structure and function among all associates through space and time.

In this chapter, we examine the consequences of the substantial diversion of water to irrigation in the Aral Sea region, the principle cause of the Aral Sea disaster. The purpose of this study is to understand the relationship of the two rivers feeding Uzbekistan to the water inflow into the Aral Sea and to economic productivity in agriculture. We find that because water consumption exceeds water formation, the prognosis for future growth in agricultural output is at risk. Uzbekistan and its neighbors need to address the upstream and downstream rights to water access for the Syr and Amu rivers. The solutions to our immediate problems can be found inside Uzbekistan. Improving water efficiency and water conservation is a necessary, economical option compared to other proposals.