Design Of Triboelectric Energy Harvesting System Based On Gas-liquid Two-phase Flow

With the development of modern society,the consumption of traditional energy sources has further increased,making the development of new renewable energy sources or new energy supply methods crucial for promoting the development of the electronic information industry and alleviating energy crises.In addition to mature energy collection methods such as wind,tidal,and solar power,mechanical energy is also a common and widely available source of energy.Frictional electrification is a common phenomenon in daily life,but due to its harmful effects,it has always been regarded as a disadvantage.However,by utilizing the frictional electrification phenomenon,new renewable energy sources such as Triboelectric Nanogenerators(TENG)can convert mechanical energy into electrical energy.TENG has the advantages of low cost,environmental friendliness,and a wide selection of materials,and can be widely used in self-powered sensors,self-powered systems,wearable sensors,and other fields.With further research,the electrical output performance of TENG has gradually improved and can now be widely used in collecting mechanical energy and blue energy.According to the type of friction layer material,TENG can be divided into solid-solid friction and solid-liquid friction,among which the solid-liquid friction nanogenerator(SL-TENG)is very suitable for blue energy collection and ocean sensing devices due to the involvement of liquid in the friction layer material.However,due to the limitations of its output performance,it is not sufficient to make it a practical new energy collection solution.This article proposes a new method to improve the output performance of SL-TENG by introducing high-speed airflow to increase the contact area and separation rate between the solid and liquid.This study investigates the feasibility of this new method through the following work:1.A gas-liquid two-phase flow frictional power generation system(GL-TENG)based on rheological characteristics and Venturi tube structure was designed.The core component is a solid-liquid frictional section composed of two polytetrafluoroethylene pipes.The high-speed gas flow can disperse liquid droplets into countless small droplets,which then rapidly frictionally rub against the polytetrafluoroethylene pipe wall.After optimizing the circuit design,GL-TENG can convert the frictional energy into electrical energy output,improving energy collection efficiency.A gas-liquid two-phase flow frictional power collection system based on a discharge module(DGL-TENG)was studied.The efficient energy conversion is achieved through frictional charge generation,export,and discharge processes.The system consists of a power generation part and a discharge part.In the power generation part,when liquid droplets separate from the pipe wall at high speed,the pipe wall carries a negative charge,and the liquid droplets carry a positive charge.Finally,the positive and negative charges are respectively collected by the discharge device to generate current output.A gas-liquid two-phase flow frictional power collection system based on an induction module(IGL-TENG)was studied,which mainly utilizes the principle of electrostatic induction.Highpressure gas flow is used to disperse the liquid,and positive charges are generated when the polytetrafluoroethylene pipe wall and the liquid droplets rub against each other.An equal amount of induced positive charges is produced through electrostatic induction.The induced charges are collected by a copper foil induction layer and a copper mesh receiver,generating current and voltage outputs.The system has high current and voltage outputs,as well as excellent stability,and is expected to be applied in practical energy collection fields...