Friction Pair Device With Tesla Valve For Super-Lubricant Replenishment
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Solution Overview
Problem
Existing friction pair devices face challenges in achieving macroscopic slip and suffer from the depletion of the super-lubricant layer, leading to failure of the Slippery Liquid-Infused Porous Surface (SLIPS).
Innovation Solution
A friction pair device is designed with a friction pair stationary member featuring a dynamic pressure groove with micro-nano scale gaps, where a super-lubricant is injected to form a super-lubricant layer. The device includes micro channels, a Tesla valve structure for real-time replenishment and recovery of the super-lubricant, and a stress application device to enhance fluid dynamic pressure and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a smooth friction pair surface or micro-nanotexture surface is used, then slip length is improved (reaching micro- to nanometer scale or up to 400 μm), but macroscopic slip cannot be achieved
Solution Approach 1:
The invention uses porous materials with micro-nano scale gaps as the friction pair surface structure. The porous structure provides large surface area and capillary effects that enable super-lubricant retention and macroscopic slip behavior, resolving the limitation of smooth or simple textured surfaces that cannot achieve macroscopic slip.
Solution Approach 2:
The invention introduces super-lubricant as an intermediary substance that fills the micro-nano scale gaps of the porous surface. The super-lubricant acts as a mediator between the solid surface and the liquid medium, enabling boundary slip and macroscopic slip by reducing interfacial friction and enhancing fluid flow velocity.
2Loss of energy
If SLIPS structure is used to achieve superior tribological performance, then friction reduction is improved, but super-lubricant depletion leads to SLIPS failure
Solution Approach 1:
The invention enables the SLIPS structure to self-replenish super-lubricant through the micro channels connected to the reservoir. The system automatically maintains the super-lubricant layer in the micro-nano scale gaps without external intervention, ensuring continuous friction reduction performance and extending service life by preventing super-lubricant depletion.
Solution Approach 2:
The invention pre-fills a reservoir with super-lubricant and designs micro channels that connect the reservoir to the micro-nano scale gaps before operation begins. This preliminary preparation ensures that super-lubricant is readily available for replenishment, preventing depletion and extending the duration of action of the SLIPS structure.
3Reliability
If super-lubricant is injected into micro-nano scale gaps to form SLIPS, then tribological performance is improved, but real-time replenishment capability is lacking
Solution Approach 1:
The invention transforms the static SLIPS structure into a dynamic system by adding micro channels and a reservoir that enable real-time super-lubricant replenishment. The system can adaptively maintain its tribological performance by dynamically replenishing super-lubricant as needed, rather than being limited to a fixed initial amount.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The device achieves superior tribological performance by maintaining a super-slip state, enhancing fluid dynamic pressure, and reducing frictional energy consumption, while the real-time replenishment and recovery of the super-lubricant extend the service life of the SLIPS.
Implementation Method 1
Boundary slip may occur between fluid molecules and a solid surface due to the poor wettability of the solid surface. Typically, both a hydrophobic surface and a hydrophilic surface exhibit boundary slip, with a slip length generally in the micro- to nanometer scale.
Implementation Method 2
a super-lubricant layer allows a liquid-film and liquid medium molecules of a super-lubricant layer interface to move freely along the dynamic pressure groove bottom. A slip velocity of the liquid medium molecules approaches a moving velocity of a friction pair dynamic surface, a slip length of the liquid medium molecules approaches positive infinity, and a super slip surface is formed
Implementation Method 3
a super-lubricant is injected into the micro-nano scale gaps to form a super-lubricant layer. The super-lubricant layer allows a liquid-film and liquid medium molecules of a super-lubricant layer interface to move freely along the dynamic pressure groove bottom.
Implementation Method 4
The Tesla valve structure includes a forward Tesla valve and a reverse Tesla valve. The forward Tesla valve is configured to enable a flow connection between the plurality of micro channels and an oil reservoir, and the reverse Tesla valve is configured to enable a flow connection between the dynamic pressure groove bottom and the oil reservoir.
Data Source
AI summary
Provide is a friction pair device comprising a friction pair stationary member, a plurality of micro channels, a Tesla valve structure, and a stress application device. The friction pair stationary member includes a friction pair static surface, which friction pair static surface is provided with a dynamic pressure groove. The dynamic pressure groove includes a dynamic pressure groove bottom. A surface of the dynamic pressure groove bottom is provided with micro-nano scale gaps. A super-lubricant is injected into the gaps to form a super-lubricant layer, allowing liquid medium molecules of a liquid-film to move freely along the dynamic pressure groove bottom. A slip velocity of the liquid medium molecules approaches a moving velocity of a friction pair dynamic surface, a slip length of the liquid medium molecules approaches positive infinity, and a super slip surface is formed on the dynamic pressure groove bottom.