scholarly journals Improved Rectification and Osmotic Power in Polyelectrolyte-Filled Mesopores

Micromachines ◽  
2020 ◽  
Vol 11 (10) ◽  
pp. 949
Author(s):  
Ding-Cheng Zheng ◽  
Li-Hsien Yeh
Keyword(s):  
Power Generation ◽  
Ionic Current ◽  
Space Charge Density ◽  
Power Performance ◽  
Power Harvesting ◽  
Power Generator ◽  
Space Charges ◽  
High Space ◽  
Narrow Opening ◽  
Ionic Devices

Ample studies have shown the use of nanofluidics in the ionic diode and osmotic power generation, but similar ionic devices performed with large-sized mesopores are still poorly understood. In this study, we model and realize the mesoscale ionic diode and osmotic power generator, composed of an asymmetric cone-shaped mesopore with its narrow opening filled with a polyelectrolyte (PE) layer with high space charges. We show that, only when the space charge density of a PE layer is sufficiently large (>1×106 C/m3), the considered mesopore system is able to create an asymmetric ionic distributions in the pore and then rectify ionic current. As a result, the output osmotic power performance can be improved when the filled PE carries sufficiently high space charges. For example, the considered PE-filled mesopore system can show an amplification of the osmotic power of up to 35.1-fold, compared to the bare solid-state mesopore. The findings provide necessary information for the development of large-sized ionic diode and osmotic power harvesting device.

A Carbon Nanotube Film for Power Harvesting

2006 ◽  
Vol 326-328 ◽  
pp. 1447-1450 ◽  
Author(s):  
In Pil Kang ◽  
Gyeong Rak Choi ◽  
Joo Yung Jung ◽  
Yong Hoon Chang ◽  
Yeon Sun Choi ◽  
...  
Keyword(s):  
Power Generation ◽  
Carbon Nanotubes ◽  
Fluid Flow ◽  
Carbon Nanotube ◽  
Ionic Conductivity ◽  
Aqueous Environment ◽  
Power Harvesting ◽  
Power Generator ◽  
Power Generators ◽  
Carbon Nanotube Film

This paper experimentally investigates the power generation property of carbon nanotubes in an aqueous environment. Carbon nanotube based films are investigated in this paper as a new method for power generation based on ionic conductivity of the fluid. It is demonstrated that a carbon nanotube film that is bonded onto a structure vibrating with an electrolyte on the surface produces an alternating current without a net fluid flow. The power produced is smaller than for a piezoelectric material of the same size, but the CNT power generator is lightweight and has no moving parts, and does not require the structure to be immersed in an electrolyte. There are various possible applications for nanotube power generators.

Experimental Study on a Cascade Flapping Wing Hydroelectric Power Generator

2011 ◽  
Author(s):  
Hisanori Abiru ◽  
Akira Yoshitake
Keyword(s):  
Power Generation ◽  
Electric Motor ◽  
Flapping Wing ◽  
Hydroelectric Power ◽  
Power Generator ◽  
Flow Energy ◽  
Wing Model ◽  
Leaf Springs ◽  
Hydroelastic Response ◽  
Elastically Supported

In this paper, a hydroelectric power generator that can extract the water flow energy from the hydroelastic response of an elastically supported rectangular wing is experimentally investigated. An electric motor is used to excite pitching oscillations of the wing. The wing and the electric motor are supported by leaf springs that are designed to function both as a linear guide for the sway oscillations and as elastic elements. The wing mass in the sway direction necessary to achieve a hydroelastic response is obtained by utilizing a mechanical snubber mechanism. The load to generate electricity is provided equivalently by magnetic dampers. In a previous paper, the power generation rate and the efficiency of a single-wing model were examined through experiments, and the feasibility of a flapping wing hydroelectric power generator was verified. In this paper, the influence of neighboring wings is examined by using two experimental apparatuses with the intention of achieving a practical cascade-wing generator. Tests showed that a cascade moving in-phase with neighboring wings with smaller gaps between the wings has a higher rate of electric power generation.

Fundamental Study on Friction-Driven Gyroscopic Power Generator Works Under Arbitrary Vibration

2019 ◽  
Author(s):  
Aya Watanabe ◽  
Ryousuke Yuyama ◽  
Hiroshi Hosaka ◽  
Akira Yamashita
Keyword(s):  
Power Generation ◽  
High Speed ◽  
Electrical Power ◽  
Low Frequency ◽  
Inertial Force ◽  
Fundamental Study ◽  
Power Generator ◽  
Energy Harvesters ◽  
Low Frequency Vibration ◽  
Circular Track

Abstract This paper describes a friction-driven gyro generator that works under arbitrary vibrations and generates more than 1 W of power. Vibrational generators are energy harvesters that convert environmental vibrations into electrical power via the inertial force of pendulums. In conventional generators that use simple vibration, the power is less than 10 mW for a wearable size because vibrations in the natural environment are as low as 1 Hz. Gyroscopic generators increase the inertial force by rotating a pendulum at high speed and creating a gyro effect. In this generator, a palm-size product that generates 0.1 W and weighs 280 g has already been commercialized, but this device operates only under a particular vibration that synchronizes rotor precession and stalls under random vibration. To solve this problem, in this research, two gimbals and a precession spring are introduced to support the rotor. We developed a prototype generator with straight tracks measuring 16 cm × 11 cm × 12 cm with a mass of 980 g. Under a vibration of 4 Hz and ±20 degrees, power generation of 1.6 W was confirmed. Next, a prototype circular track was made. Power generation of 0.2 W with a vibration of 1 Hz and ±90 degrees was confirmed. Finally, a simple formula to estimate the upper limit of the generation power is derived. It is suggested that the circular-type generator is suitable for low-frequency vibration and can generate twice the power of a straight-type generator.

Possibilities for a Novel Wave Power Generator Using Dielectric Elastomers

2020 ◽  
Author(s):  
S. Chiba ◽  
M. Waki ◽  
C. Jiang ◽  
K. Fujita
Keyword(s):  
Power Generation ◽  
Renewable Energy ◽  
Wave Power ◽  
Generation System ◽  
Ocean Energy ◽  
Power Generator ◽  
Energy Demands ◽  
Worldwide Population ◽  
Power Generation System ◽  
Effective Use

Abstract As industrialization, worldwide population growth, and improvements in the living standards in developing countries continue, demands for energy, food, and water, likewise surge. This in turn accelerates global warming, and its resultant extreme weather effects. Among the measures proposed to meet the growing energy demands, the use of renewable energy is gaining more and more attention. In particular, wave power generation is attracting a great deal of attention as an effective use of ocean energy. However, current wave generators are large and very expensive relative to their output. Furthermore, they cannot generate power efficiently with wave directivity, small amplitude waves and so on. For these reasons, widespread use is very limited. In order to solve these problems, this paper discusses the possibility of a recently developed wave power generator that uses a newly developed dielectric elastomer (DE) as a new way to harvest renewable energy. We also discuss the technical breakthrough of building a mega power generation system using DEs.

A Multi-Mode Vibration-Based Power Generator for Vehicles

2012 ◽  
Vol 251 ◽  
pp. 124-128
Author(s):  
Seiji Hashimoto ◽  
Nobuyuki Nagai ◽  
Yoshimitsu Fujikura ◽  
Jyunpei Takahashi ◽  
Shunji Kumagai ◽  
...  
Keyword(s):  
Power Generation ◽  
Lead Zirconate Titanate ◽  
Lead Zirconate ◽  
Experimental Results ◽  
Power Generator ◽  
Effective Power ◽  
New Device ◽  
Mode Vibration ◽  
Power Generation Device ◽  
Multi Mode

This paper presents a novel vibration power generation device for vehicles where effective power generation can be obtained by multi-mode vibration of the vehicles. First, road tests of the vehicle are performed, and then the obtained data is analyzed. Next, a vibration power generation device specially designed for the vehicle is proposed. This new device is composed of the multiple masses and spring plates equipped with lead zirconate titanate (PZT), and is effective in multi-mode vibration. The validity of the developed device is confirmed by the simulation and experimental results.

Multi-Layer Thermionic-Tunneling Structures for Power Generation

2005 ◽  
Author(s):  
Taofang Zeng
Keyword(s):  
Heat Transfer ◽  
Power Generation ◽  
Electron Transport ◽  
Heat Source ◽  
Heat Sink ◽  
Interface Design ◽  
Thermionic Emission ◽  
Power Generator ◽  
Layer Structures ◽  
Substantial Temperature

A new method for power generation based on nano-engineered interface design with partially filled gap is proposed. The device combines electron thermionic emission and tunneling to enhance electron transport. Thermal radiation and tunneling contribute to heat transfer in the device, which can be minimized using selected materials. The largely reduced heat transfer coupled with use of multi-layer structures enable a substantial temperature difference between heat source and heat sink or two electrodes, thereby maximizing heat source utilization. Detailed analyses are provided for the solid device operating either as a power generator or as a cooler.

scholarly journals Experimental Investigation for a Novel Prototype of a Thermoelectric Power Generator With Heat Pipes

2021 ◽  
Vol 9 ◽  
Author(s):  
Yan Liu ◽  
Zhaochun Shi ◽  
Guohua Wang ◽  
YuYing Yan ◽  
Yingchao Zhang
Keyword(s):  
Power Generation ◽  
Water Flow ◽  
Cold Water ◽  
Air Flow ◽  
Cold Side ◽  
Power Generator ◽  
Wave Trough ◽  
Hot Air ◽  
Thermoelectric Power Generator ◽  
Power Generation Performance

In order to obtain the power generation of the thermoelectric power generator (TEG) group, a similar structure of the disc sandwich structure and an experimental system are built to analyze the power generation performance and temperature characteristics. To improve heat transfer and move heat from the hot side to the cold side, heat pipes with high thermal conductivity are arranged on the adjacent cold and hot plates of the TEG. The similar sandwich structure has 17 cold plates and 17 hot plates for the TEG pieces, which are connected in series on the circuit. Working conditions are hot air flow and cold water flow; hot air temperature and cold water temperature are set to a fixed temperature. The power generation of a single TEG is tested for verifying linear changes in the power generation performance with temperature differences (Td). Experimental results are that the power generation is improved by the air flow and water flow increasing. The water flow has a smaller effect on the power generation than the air flow. In the cold side of TEG pieces, the temperature of the cold side showed a gradual upward trend, the temperature of the hot side showed a wave trough phenomenon, and the Td showed a wave trough phenomenon. The hot air flow and the cold water changing cannot weaken the temperature trend of the hot side and the cold side. The hot air flow can more significantly increase the Td than the cold water.

Experimental Study on the Possibility of Electric Power Generation by Using a Thermosyphon System

2003 ◽  
Author(s):  
Tsutomu Hosokawa ◽  
Masafumi Tomita ◽  
Isamu Sakamoto ◽  
Masaru Omura
Keyword(s):  
Power Generation ◽  
Electric Power ◽  
Resource Conservation ◽  
Temperature Gradients ◽  
Working Fluid ◽  
Heat Transfer Characteristics ◽  
Small Temperature ◽  
Electric Power Generation ◽  
Power Generator ◽  
Zone Water

Generally, a thermosyphon is utilized as a heat exchanger. Then, it is an effective equipment for one of the solutions of today’s resource conservation and saving energy problems. The thermosyphon is able to transport heat between small temperature gradients without the need for the outside power. The system has three parts, an evaporator zone, adiabatic zone and condensed zone. The efficiently cycle of the thermal hydraulics system observed in the three zones of this thermosyphon is structurally examined for energy-conversion. The authors installed a power generator in the insulation zone of the thermosyphon, and examined the possibility of electric power generation and the heat transfer characteristics of the thermosyphon. The adiabatic zone was made of an acrylic tube. A turbine and a nozzle were set in the adiabatic zone. Water was used as working fluid. As a result, we confirmed that the output of the electric power and the heat transport rate of about 70–90% for this system were obtained.

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