CN106059393B - A kind of hot rectifier of inverse piezoelectricity and the method for improving hot rectification efficiency - Google Patents

Abstract

The invention discloses an inverse piezoelectric electrothermal rectifier and a method for improving thermal rectification efficiency, including a heating arm, a DC power supply, a wire, a variable resistor, a switch, a heat source, a cold source, and a copper electrode. The DC power supply is connected to the copper electrode through a wire. The inverse piezoelectric effect of the thermal arm under the action of the electric field leads to changes in geometry, which in turn lead to changes in thermal resistance and heat flow, and heat flow control is achieved through voltage control. The thermal rectifier of the present invention changes the boundary scattering intensity of the heat flow during transmission through the inverse piezoelectric effect, can effectively control the heat flow, and improve the heat rectification efficiency.

Description

An inverse piezoelectric thermal rectifier and a method for improving thermal rectification efficiency

technical field

The invention relates to an inverse piezoelectric electric thermal rectifier and a method for improving thermal rectification efficiency, belonging to the technical field of heat and mass transfer.

Background technique

Thermal rectifiers are basic devices for thermal diodes, thermal transistors, thermal logic gates, and thermal memories, and have potential applications in heat transport, thermal control, and information processing. The thermal rectifier can control the size of the heat flux by means of element doping and geometric structure to realize thermal rectification. At present, thermal rectifiers can only achieve a fixed thermal rectification efficiency during use, and cannot be adjusted in real time according to requirements, which greatly limits the application range of thermal rectifiers.

Contents of the invention

In view of the problems existing in the prior art, the present invention discloses an inverse piezoelectric thermal rectifier and a method for improving the thermal rectification efficiency of the thermal rectifier. The disclosed technical solution is to use the inverse piezoelectric effect to change the cross-sectional shape of the thermal arm, thereby Effectively change the boundary scattering rate of the heat flow, thereby controlling the inverse piezoelectric effect by adjusting the electric field strength, thereby controlling the heat flow.

Specifically, the present invention is achieved through the following technical solutions:

A thermal rectifier includes a thermal arm, a DC power supply, a wire, a variable resistor, a switch, a heat source, a cold source and copper electrodes. The DC power supply is connected to the copper electrodes through wires. Under the action of the electric field, the geometric shape of the thermal arm changes due to the inverse piezoelectric effect, which in turn leads to changes in thermal resistance and heat flow. Therefore, the heat flow can be controlled by adjusting the voltage. The thermal rectifier of the present invention changes the boundary scattering intensity of the heat flow during transmission through the inverse piezoelectric effect, can effectively control the heat flow, and improve the heat rectification efficiency.

Among them, the thermal arm is made of piezoelectric materials, and quartz crystal, lithium gallate, lithium germanate, titanium germanate, and lithium tantalate are commonly used piezoelectric materials. Under the action of forward voltage, piezoelectric materials produce inverse piezoelectric effect and compression phenomenon. Under the action of reverse voltage, stretching phenomenon occurs.

Wherein, the DC power supply is connected to the copper electrodes through wires, variable resistors and switches, and the power supply voltage is 0.1~3V.

The technical solution of the present invention is: using the inverse piezoelectric effect, by applying a voltage at both ends of the thermal arm, the thermal arm is deformed, resulting in a change in the boundary scattering rate of the heat flow, thereby changing the heat flow. Using the variable resistor to adjust the voltage and control the deformation of the thermal arm can realize real-time control of the heat flow and improve the adaptability and efficiency of the thermal rectifier.

Based on the above, the present invention correspondingly discloses a method for improving the rectification efficiency of a thermal rectifier, which uses the inverse piezoelectric effect to change the thermal resistance of the thermal arm to improve the thermal rectification efficiency.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of the thermal rectifier of the present invention.

Detailed ways

With reference to accompanying drawing 1, have shown the circuit structure of thermal rectifier of the present invention, comprise heat source 1, heating arm 2, electrode 3, forward DC power supply 4, reverse DC power supply 5, switch 6, variable resistance 7, cold source 8. The heat source 1 absorbs heat and releases heat flow, and the heat flow flows to the cold source 8 in the direction of the arrow through the heat arm 2 to realize the transmission of heat signals. When the positive power switch is closed, the thermal arm undergoes compression deformation under the action of electric field force. When the reverse power switch is closed, the thermal arm is stretched and deformed. The deformation results in a change in the heat flow boundary scattering rate, which changes the thermal resistance and changes the heat flow.

The voltage of the forward DC power supply 4 and the reverse DC power supply 5 should be in the range of 0.1~3v, and they are connected to the heating arm through the switch 6, the variable resistor 7 and the copper electrode 3. An electric field is formed at both ends of the thermal arm, and due to the electric polarity of the thermal arm, deformation occurs under the action of the electric field force.

The thermal arm is made of piezoelectric materials. Quartz crystal, lithium gallate, lithium germanate, titanium germanate, and lithium tantalate are commonly used piezoelectric materials. Under the inverse piezoelectric effect, the length and width of the rectangular section should vary by more than 0.1 microns.

The variable resistor can be a film resistor with a resistance value of 10K~100K ohms.

The wires used for DC power connection are copper or aluminum wires to effectively reduce power waste.

In the reverse piezoelectric electrothermal rectifier of the present invention, when the voltage is forward and reverse biased, the forward DC power supply 4 and the reverse DC power supply 5 respectively provide power for the thermal rectification system to generate an external voltage to generate an electric field at both ends of the thermal arm , the inverse piezoelectric effect occurs to realize thermal rectification.

Claims (5)

1. An inverse piezoelectric electrothermal rectifier is characterized in that it comprises a heating arm, a DC power supply, a lead, a variable resistor, a switch, a heat source, and a copper electrode, and the heating arm material is made of a piezoelectric material, quartz crystal or lithium gallate or Lithium germanate or lithium tantalate are commonly used piezoelectric materials. The heat flow flows from the heat source to the cold source through the hot arm. The DC power supply is connected to the copper electrodes through wires, variable resistors, and switches. The copper electrodes are arranged on two corresponding cubic hot arms. On the side of , when the forward power switch is closed, the thermal arm undergoes compressive deformation under the action of the electric field force, and when the reverse power switch is closed, the thermal arm undergoes tensile deformation, and the deformation causes the heat flow boundary scattering rate to change, thereby changing the thermal resistance , the heat flow changes, so the real-time and efficient control of the heat flow can be realized by adjusting the voltage direction and value. 2. A kind of inverse piezoelectric electrothermal rectifier as claimed in claim 1, characterized in that: The hot arm adopts a variable cross-section structure, which is formed by superimposing small cross-section cubes and large cross-section cubes. 3. A kind of inverse piezoelectric electrothermal rectifier as claimed in claim 1, characterized in that: Copper electrodes are applied on large cross-section thermal arms. 4. A kind of inverse piezoelectric electrothermal rectifier as claimed in claim 1, characterized in that: DC power supply voltage is 0.1 ~ 3V. 5. A method for improving thermal rectification and rectification efficiency, which is characterized in that the geometric shape and thermal resistance of the thermal arm are changed by using the inverse piezoelectric effect, the voltage amplitude is adjusted by the variable resistor, the voltage direction is changed by the switch, and the deformation of the thermal arm is controlled to change heat flow.