scholarly journals Breaking the symmetry to suppress the Plateau–Rayleigh instability and optimize hydropower utilization

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zhipeng Zhao ◽  
Huizeng Li ◽  
An Li ◽  
Wei Fang ◽  
Zheren Cai ◽  
...  
Keyword(s):  
Power Generation ◽  
Collection Efficiency ◽  
Droplet Impact ◽  
Solid Surfaces ◽  
Energy Utilization ◽  
Hydroelectric Power ◽  
Rayleigh Instability ◽  
Droplet Dynamics ◽  
Satellite Drops ◽  
Hydroelectric Power Generation

AbstractDroplet impact on solid surfaces is essential for natural and industrial processes. Particularly, controlling the instability after droplet impact, and avoiding the satellite drops generation, have aroused great interest for its significance in inkjet printing, pesticide spraying, and hydroelectric power collection. Herein, we found that breaking the symmetry of the droplet impact dynamics using patterned-wettability surfaces can suppress the Plateau–Rayleigh instability during the droplet rebounding and improve the energy collection efficiency. Systematic experimental investigation, together with mechanical modeling and numerical simulation, revealed that the asymmetric wettability patterns can regulate the internal liquid flow and reduce the vertical velocity gradient inside the droplet, thus suppressing the instability during droplet rebounding and eliminating the satellite drops. Accordingly, the droplet energy utilization was promoted, as demonstrated by the improved hydroelectric power generation efficiency by 36.5%. These findings deepen the understanding of the wettability-induced asymmetrical droplet dynamics during the liquid–solid interactions, and facilitate related applications such as hydroelectric power generation and materials transportation.

Breaking the symmetry: Suppressing Plateau-Rayleigh instability and optimizing hydropower utilization

2021 ◽  
Author(s):  
Zhipeng Zhao ◽  
An Li ◽  
Huizeng Li ◽  
Wei Fang ◽  
Zheren Cai ◽  
...  
Keyword(s):  
Power Generation ◽  
Collection Efficiency ◽  
Droplet Impact ◽  
Solid Surfaces ◽  
Energy Utilization ◽  
Hydroelectric Power ◽  
Rayleigh Instability ◽  
Droplet Dynamics ◽  
Satellite Drops ◽  
Hydroelectric Power Generation

Abstract Droplet impact on solid surfaces is essential for natural and industrial processes. Particularly, controlling the instability after droplet impact, and avoiding the satellite drops generation, have aroused great interest for its significance in inkjet printing, pesticide spraying, and hydroelectric power collection. Herein, we found that breaking the symmetry of the droplet impact dynamics using patterned-wettability surfaces can suppress the Plateau-Rayleigh instability during the droplet rebounding and improve the energy collection efficiency. Systematic experimental investigation, together with mechanical modeling and numerical simulation, revealed that the asymmetric wettability patterns can regulate the internal liquid flow and reduce the vertical velocity gradient inside the droplet, thus suppressing the instability during droplet rebounding and eliminating the satellite drops. Accordingly, the droplet energy utilization was promoted, as demonstrated by the improved hydroelectric power generation efficiency by 36.5%. These findings deepen the understanding of the wettability-induced asymmetrical droplet dynamics during the liquid-solid interactions, and facilitate related applications such as hydroelectric power generation and materials transportation.

Utilization of prosodic and linguistic cues during perceptions of nonunderstandings in radio communication

2016 ◽  
Vol 38 (3) ◽  
pp. 509-539 ◽  
Author(s):  
JAIME C. AUTON ◽  
MARK W. WIGGINS ◽  
BEN J. SEARLE ◽  
NAN XU RATTANASONE
Keyword(s):  
Power Generation ◽  
High Risk ◽  
Distributed Environments ◽  
Hydroelectric Power ◽  
Verbal Instruction ◽  
Radio Communication ◽  
Risk Environments ◽  
Prosodic Cues ◽  
Linguistic Cues ◽  
Hydroelectric Power Generation

ABSTRACTThe readback/hearback loop is a communicative protocol used in many high-risk environments to ensure that a verbal instruction has been heard correctly by a receiver. However, it does not necessarily ensure that an instruction has been understood. Using an international sample of hydroelectric power generation controllers, this study examined whether particular linguistic (complete and partial readbacks) and prosodic (final intonation, filler, and interturn delay) cues contained within a readback response could signal to listeners the extent to which speakers had understood an instruction. The results indicated that different prosodic cues are used to detect nonunderstandings, depending upon the linguistic content of the readback. The results have implications for training and system design in distributed environments.

scholarly journals Relevant parameters for characterizing mountain rivers: a review

RBRH ◽  
2019 ◽  
Vol 24 ◽  
Author(s):  
Maurício Andrades Paixão ◽  
Masato Kobiyama
Keyword(s):  
Power Generation ◽  
Grain Size ◽  
Water Resources ◽  
Fluvial Geomorphology ◽  
Field Survey ◽  
Hydroelectric Power ◽  
Mountain Rivers ◽  
Fluvial Dynamics ◽  
Sporting Activities ◽  
Hydroelectric Power Generation

ABSTRACT Mountain rivers are situated in a large portion of the terrestrial surface, especially in headwaters regions, and have been used for various purposes such as recreation, sporting activities, water resources and hydroelectric power generation. However, hydrogeomorphic characteristics of mountain rivers are not fully understood. In this context, the present paper aimed to identify relevant parameters for characterizing rivers in these environments based on bibliographical review. It was identified which parameters have been used and how they have been used to characterize mountain rivers in distinct classifications. The most cited parameters were channel gradient, relation between river width and depth, entrenchment ratio, discharge, sediment transport and grain-size distribution. Also, the current situation related to researches in fluvial geomorphology in mountain rivers in Brazil was evaluated, and the strong need of field survey as basis for the best understanding of mountain fluvial dynamics and characterization was verified.

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