Ferromagnetic Liquid Droplet on a Superhydrophobic Surface for the Transduction of Mechanical Energy to Electricity Based on Electromagnetic Induction

ACS Nano ◽  
2021 ◽  
Author(s):  
Zheng Ma ◽  
Qi Wang ◽  
Jingwei Ai ◽  
Bin Su
Keyword(s):  
Superhydrophobic Surface ◽  
Electromagnetic Induction ◽  
Liquid Droplet ◽  
Mechanical Energy

Research on Loss and Temperature Rise of a Novel Dynamic Electromagnetic Induction Heater

2012 ◽  
Vol 468-471 ◽  
pp. 3108-3112
Author(s):  
Hai Du ◽  
Yan Bin Qu
Keyword(s):  
Electromagnetic Induction ◽  
Mechanical Energy ◽  
Heat Flux Distribution ◽  
Element Analysis ◽  
Operation Mechanism ◽  
Induction Heater ◽  
Copper Loss ◽  
Electromagnetic Field Theory ◽  
The Finite Element Analysis ◽  
The Mathematical Model

A novel dynamic electromagnetic induction heater for water treatment system is introduced in this paper, and its structure and operation mechanism is given. The heater converts input mechanical energy into various forms of heat energy completely, including the hyseresis loss, eddy current loss, copper loss and so on, and the mathematical model of loss is established based on fundamental electromagnetic field theory. By the finite element analysis, the above three kinds of loss are calculated at different rotation speed, as well as each of the percentage of total loss. At last, the temperature field and heat flux distribution of heater are calculated.

scholarly journals Overview of Human Walking Induced Energy Harvesting Technologies and Its Possibility for Walking Robotics

Energies ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 86 ◽  
Author(s):  
Hu Shi ◽  
Zhaoying Liu ◽  
Xuesong Mei
Keyword(s):  
Energy Conversion ◽  
Smart Materials ◽  
Electromagnetic Induction ◽  
Mechanical Energy ◽  
Human Walking ◽  
Energy Harvest ◽  
Inertial Element ◽  
The Past ◽  
Overall Efficiency ◽  
Triboelectric Effect

This study is mainly to provide an overview of human walking induced energy harvest. Focusing on the proportion of all energy sources provided by daily activity, the available human walking induced energy is divided with respect to the generation principle. The extensive research on harvesting energy results from body vibration, inertial element, and foot press to convert into electricity is overviewed. Over the past decades, various smart materials have been employed to achieve energy conversion. Generators based on electromagnetic induction or the triboelectric effect were developed and integrated. Small captured power and low overall efficiency are criticized. The concept of human walking energy harvest is extended into the wearable walking robotics using other mediums, such as fluid, to transmit power instead of electricity. By comparison, it is indicated that less energy conversion links are involved in energy regeneration of such applications and expected to guarantee less loss and higher efficiency. Meanwhile, in order to overcome the shortage of relatively low power output, comments are made that the harvester should be capable of adaptation under the condition that the mechanical energy of lower limb and feet is subject to change in different gait phases so as to maximize the collected energy.

Two-Pronged Jet Formation Caused by Droplet Impact on Anisotropic Superhydrophobic Surfaces

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
J. T. Pearson ◽  
D. Bilodeau ◽  
D. Maynes
Keyword(s):  
Superhydrophobic Surface ◽  
Liquid Droplet ◽  
Droplet Impact ◽  
Surface Patterning ◽  
Superhydrophobic Surfaces ◽  
Ohnesorge Number ◽  
Jet Formation ◽  
Anisotropic Surface ◽  
Impact Experiments ◽  
Droplet Impacts

When a liquid droplet impacts a superhydrophobic surface with anisotropic surface patterning in the form of alternating ribs and cavities, the rebounding droplet may exhibit a unique two-pronged jet emission. Droplet impact experiments with 11 different fluids of viscosity that varied by more than three orders of magnitude were conducted, and this paper quantifies the Capillary number, Ca, and Ohnesorge number, Oh, ranges over which the two-pronged phenomenon occurs. For Oh > 0.0154, the behavior was never observed, while at lower values of Oh, the behavior occurs for an intermediate range of Ca that depends on Oh.

scholarly journals Functional Superhydrophobic Surfaces with Spatially Programmable Adhesion

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2968
Author(s):  
Duan-Yi Guo ◽  
Cheng-Huan Li ◽  
Li-Min Chang ◽  
Hung-Chang Jau ◽  
Wei-Chun Lo ◽  
...  
Keyword(s):  
Superhydrophobic Surface ◽  
Liquid Droplet ◽  
Superhydrophobic Surfaces ◽  
Patterned Surfaces ◽  
Liquid Droplets ◽  
Practical Applications ◽  
Crystal Polymer ◽  
Smart Surfaces ◽  
Enhanced Raman Scattering ◽  
Spatially Varying

A superhydrophobic surface that has controllable adhesion and is characterized by the lotus and petal effects is a powerful tool for the manipulation of liquid droplets. Such a surface has considerable potential in many domains, such as biomedicine, enhanced Raman scattering, and smart surfaces. There have been many attempts to fabricate superhydrophobic films; however, most of the fabricated films had uniform adhesion over their area. A patterned superhydrophobic surface with spatially controllable adhesion allows for increased functions in the context of droplet manipulation. In this study, we proposed a method based on liquid-crystal/polymer phase separation and local photopolymerization to realize a superhydrophobic surface with spatially varying adhesion. Materials and topographic structures were analyzed to understand their adhesion mechanisms. Two patterned surfaces with varying adhesion were fabricated from a superhydrophobic material to function as droplet guides and droplet collectors. Due to their easy fabrication and high functionality, superhydrophobic surfaces have high potential for being used in the fabrication of smart liquid-droplet-controlling surfaces for practical applications.

Smart Damping System Based on MR Damper and Electromagnetic Induction Device for Suppressing Vibration of Stay Cable

2009 ◽  
Author(s):  
In-Ho Kim ◽  
Dong-Doo Jang ◽  
Hyung-Jo Jung ◽  
Jeong-Hoi Koo
Keyword(s):  
Control System ◽  
Electromagnetic Induction ◽  
Passive Control ◽  
Mechanical Energy ◽  
Mr Damper ◽  
Electrical Energy ◽  
Induced Voltage ◽  
Stay Cable ◽  
Power Sources ◽  
Cable Vibrations

This paper investigates the effectiveness of a smart damping system consisting of a magnetorheological (MR) damper and an electromagnetic induction (EMI) device in reducing cable vibrations. The smart damping system incorporates an EMI device to reduce complexity of conventional MR damper based semi-active control system by eliminating external power sources. This is because the EMI part in the system generates electrical energy (i.e., induced voltage) from mechanical energy (i.e., reciprocal motions of an MR damper), which can be used as a power source for the MR damper. The primary goal of this experimental study is to evaluate the performance of the proposed smart damping system using a full-scale, 44.7 meters long, high-tension cable. To this end, free vibration responses and damping of the proposed smart damping system were compared with those of an equivalent passive control system. The experimental results show that the smart damping system shows better control performance than all the passive control cases.

Hybridizing Triboelectrification and Electromagnetic Induction Effects for High-Efficient Mechanical Energy Harvesting

ACS Nano ◽  
2014 ◽  
Vol 8 (7) ◽  
pp. 7442-7450 ◽  
Author(s):  
Youfan Hu ◽  
Jin Yang ◽  
Simiao Niu ◽  
Wenzhuo Wu ◽  
Zhong Lin Wang
Keyword(s):  
Energy Harvesting ◽  
Electromagnetic Induction ◽  
Mechanical Energy ◽  
High Efficient

Two-Pronged Jet Formation Caused by Droplet Impact on Anisotropic Superhydrophobic Surfaces

2013 ◽  
Author(s):  
John T. Pearson ◽  
Daniel Maynes ◽  
David Bilodeau ◽  
Brent W. Webb
Keyword(s):  
Superhydrophobic Surface ◽  
Liquid Droplet ◽  
Droplet Impact ◽  
Surface Patterning ◽  
Superhydrophobic Surfaces ◽  
Ohnesorge Number ◽  
Jet Formation ◽  
Anisotropic Surface ◽  
Impact Experiments ◽  
Droplet Impacts

When a liquid droplet impacts a superhydrophobic surface with anisotropic surface patterning in the form of alternating ribs and cavities, the rebounding droplet may exhibit a unique two-pronged jet emission. Droplet impact experiments with eleven different fluids of viscosity that varied by more than three orders of magnitude were conducted, and this paper quantifies the Capillary number, Ca, and Ohnesorge number, Oh, ranges over which the two-pronged phenomenon occurs. For Oh > 0.0154, the behavior was never observed, while at lower values of Oh, the behavior occurs for an intermediate range of Ca that depends on Oh.

scholarly journals A Tubular Flexible Triboelectric Nanogenerator with a Superhydrophobic Surface for Human Motion Detecting

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3634
Author(s):  
Jianwei Wang ◽  
Zhizhen Zhao ◽  
Xiangwen Zeng ◽  
Xiyu Liu ◽  
Youfan Hu
Keyword(s):  
Energy Harvesting ◽  
Flexible Electronics ◽  
Superhydrophobic Surface ◽  
Mechanical Energy ◽  
Construction Material ◽  
Human Motion ◽  
Triboelectric Nanogenerator ◽  
Free Standing ◽  
Self Powered ◽  
Human Motion Monitoring

The triboelectric nanogenerator (TENG) is a newly arisen technology for mechanical energy harvesting from the environment, such as raindrops, wind, tides, and so on. It has attracted widespread attention in flexible electronics to serve as self-powered sensors and energy-harvesting devices because of its flexibility, durability, adaptability, and multi-functionalities. In this work, we fabricated a tubular flexible triboelectric nanogenerator (TF-TENG) with energy harvesting and human motion monitoring capabilities by employing polydimethylsiloxane (PDMS) as construction material, and fluorinated ethylene propylene (FEP) films coated with Cu as the triboelectric layer and electrode, serving in a free-standing mode. The tube structure has excellent stretchability that can be stretched up to 400%. Modifying the FEP films to obtain a superhydrophobic surface, the output performance of TF-TENG was increased by at least 100% compared to an untreated one. Finally, as the output of TF-TENG is sensitive to swing angle and frequency, demonstration of real-time monitoring of human motion state was realized when a TF-TENG was worn on the wrist.

Sign in / Sign up

Export Citation Format

Share Document