scholarly journals Investigation on the Impact-Based Energy Conversion of a Dielectric Elastomer Membrane

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 180261-180272
Author(s):  
Xi-Xin Rao ◽  
Cai-Liang Zhang ◽  
Li-Kuan Zhu ◽  
Guo-Qing Zhang ◽  
Jian-Wei Zhang ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Dielectric Elastomer ◽  
The Impact ◽  
Dielectric Elastomer Membrane

scholarly journals Electromechanical phase transition in dielectric elastomers

2011 ◽  
Vol 468 (2140) ◽  
pp. 1014-1040 ◽  
Author(s):  
Rui Huang ◽  
Zhigang Suo
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Energy Conversion ◽  
Electrical Breakdown ◽  
Dielectric Elastomer ◽  
Pure Substance ◽  
Carnot Cycle ◽  
Electromechanical Energy Conversion ◽  
Electromechanical Energy ◽  
Dielectric Elastomer Membrane

Subject to forces and voltage, a dielectric elastomer may undergo electromechanical phase transition. A phase diagram is constructed for an ideal dielectric elastomer membrane under uniaxial force and voltage, reminiscent of the phase diagram for liquid–vapour transition of a pure substance. We identify a critical point for the electromechanical phase transition. Two states of deformation (thick and thin) may coexist during the phase transition, with the mismatch in lateral stretch accommodated by wrinkling of the membrane in the thin state. The processes of electromechanical phase transition under various conditions are discussed. A reversible cycle is suggested for electromechanical energy conversion using the dielectric elastomer membrane, analogous to the classical Carnot cycle for a heat engine. The amount of energy conversion, however, is limited by failure of the dielectric elastomer owing to electrical breakdown. With a particular combination of material properties, the electromechanical energy conversion can be significantly extended by taking advantage of the phase transition without electrical breakdown.

Unravelling the impact of thiophene auxiliary in new porphyrin sensitizers for high solar energy conversion

2020 ◽  
Vol 392 ◽  
pp. 112408
Author(s):  
Palivela Siva Gangadhar ◽  
Spandana Gonuguntla ◽  
Sruthi Madanaboina ◽  
Nanaji Islavath ◽  
Ujjwal Pal ◽  
...  
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Solar Energy Conversion ◽  
The Impact

scholarly journals Optimizing the Electrical Energy Conversion Cycle of Dielectric Elastomer Generators

2014 ◽  
Vol 26 (38) ◽  
pp. 6617-6621 ◽  
Author(s):  
Samuel Shian ◽  
Jiangshui Huang ◽  
Shijie Zhu ◽  
David R. Clarke
Keyword(s):  
Energy Conversion ◽  
Electrical Energy ◽  
Dielectric Elastomer

Thermal Model of a Thin Film Pulsed Pyroelectric Generator

2016 ◽  
Author(s):  
Nicholas R. Jankowski ◽  
Andrew N. Smith ◽  
Brendan M. Hanrahan
Keyword(s):  
Thin Film ◽  
Power Generation ◽  
Energy Conversion ◽  
High Speed ◽  
High Energy ◽  
High Energy Density ◽  
Working Fluid ◽  
Film Material ◽  
Thermodynamic Cycles ◽  
The Impact

Recent high energy density thin film material development has led to an increased interest in pyroelectric energy conversion. Using state-of-the-art lead-zirconate-titanate piezoelectric films capable of withstanding high electric fields we previously demonstrated single cycle energy conversion densities of 4.28 J/cm3. While material improvement is ongoing, an equally challenging task involves developing the thermal and thermodynamic process though which we can harness this thermal-to-electric energy conversion capability. By coupling high speed thermal transients from pulsed heating with rapid charge and discharge cycles, there is potential for achieving high energy conversion efficiency. We briefly present thermodynamic equivalent models for pyroelectric power generation based on the traditional Brayton and Ericsson cycles, where temperature-pressure states in a working fluid are replaced by temperature-field states in a solid pyroelectric material. Net electrical work is then determined by integrating the path taken along the temperature dependent polarization curves for the material. From the thermodynamic cycles we identify the necessary cyclical thermal conditions to realize net power generation, including a figure of merit, rEC, or the electrocaloric ratio, to aid in guiding generator design. Additionally, lumped transient analytical heat transfer models of the pyroelectric system with pulsed thermal input have been developed to evaluate the impact of reservoir temperatures, cycle frequency, and heating power on cycle output. These models are used to compare the two thermodynamic cycles. This comparison shows that as with traditional thermal cycles the Ericsson cycle provides the potential for higher cycle work while the Brayton cycle can produce a higher output power at higher thermal efficiency. Additionally, limitations to implementation of a high-speed Ericsson cycle were identified, primarily tied to conflicts between the available temperature margin and the requirement for isothermal electrical charging and discharging.

scholarly journals Dielectric elastomer generator with diaphragm configuration

2018 ◽  
Vol 192 ◽  
pp. 01032
Author(s):  
Zhen-Qiang Song ◽  
Sriyuttakrai Sathin ◽  
Wei Li ◽  
Kazuhiro Ohyama ◽  
ShiJie Zhu
Keyword(s):  
Energy Density ◽  
Energy Conversion ◽  
Conversion Efficiency ◽  
Energy Conversion Efficiency ◽  
Dielectric Elastomer ◽  
Maximum Energy ◽  
Constant Voltage ◽  
Low Viscosity ◽  
65 J ◽  
Low Efficiency

The dielectric elastomer generator (VHB 4905, 3M) with diaphragm configuration was investigated with the constant-voltage harvesting scheme in order to investigate its energy harvesting ability. The maximum energy density and energy conversion efficiency is measured to be 65 J/kg and 5.7%, respectively. The relatively low efficiency indicates that higher energy conversion efficiency is impeded by the viscosity of the acrylic elastomer, suggesting that higher conversion efficiency with new low-viscosity elastomer should be available.

The Application of CFD Methods to Analyse the Flow Structures in the Radial Labyrinth Pump

2014 ◽  
Vol 630 ◽  
pp. 52-60 ◽  
Author(s):  
Przemyslaw Szulc
Keyword(s):  
Energy Conversion ◽  
Numerical Simulations ◽  
Structural Changes ◽  
Flow Structures ◽  
Pump Performance ◽  
The Impact ◽  
Made In

The radial labyrinth pump consists of two discs: passive and active. Both discs are equipped in special blades with the opposite angle of milling. The passive disc is motionless and the active one rotates around the axis of the pump. On the surface of the connection of two blades belonging to different discs the circulation of fluid, as a type of energy conversion is expected. To investigate the analysed set of discs and take into consideration the impact of some structural changes of the geometry of both discs on a pump performance the numerical simulations were made. In this paper the results of CFD research of the flow in the radial labyrinth pump are presented.

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