Slider Nozzle Features for Lubricant Control
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Solution Overview
Problem
Lubricant accumulation on sliders in data storage devices leads to mechanical lube pickup due to high air-shear at the trailing edge, causing read/write performance disruptions.
Innovation Solution
Incorporating nozzle features with convergent and divergent portions on the slider body to prevent fluid stagnation zones near the trailing edge, redirecting backflow and increasing forward flow velocity to minimize lubricant accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the slider operates over the data storage medium with high air-shear at the trailing edge, then read/write performance is maintained, but lubricant accumulates on the slider body causing mechanical lube pickup
Solution Approach 1:
The slider body is segmented into multiple cavities (first cavity and second cavity) separated by a center rail, with each cavity containing nozzle features. This segmentation allows independent control of airflow in different regions, enabling targeted management of lubricant flow patterns to prevent accumulation while maintaining read/write performance.
Solution Approach 2:
Nozzle features are integrated into the cavity surfaces to control airflow patterns. The nozzles generate directed fluid flow that prevents stagnation zones and reduces lubricant accumulation. This pneumatic approach uses controlled air flow dynamics to manage the lubricant without mechanical contact.
2Quantity of substance
If fluid stagnation zones are present near the trailing edge, then lubricant accumulation is promoted, but adding flow control features increases device complexity
Solution Approach 1:
The nozzle features are merged with the existing cavity structure of the slider body, integrating flow control functionality into the standard slider design. The nozzles are formed as part of the cavity surfaces, combining structural support and flow control functions in a unified structure to minimize additional complexity.
Solution Approach 2:
Nozzle features are selectively positioned on specific cavity surfaces (first and second cavities) rather than uniformly across the entire slider. This localized approach targets areas where stagnation zones occur, providing flow control precisely where needed while avoiding unnecessary features in other regions.
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
Effectively reduces lubricant accumulation zones, preventing mechanical lube pickup and maintaining optimal read/write performance by managing airflow and fluid flow around the slider.
Implementation Method 1
redirecting backflow and increasing forward flow velocity to minimize lubricant accumulation
Implementation Method 2
mechanical lube pickup due to the lubricant ripping off the storage medium under high air-shear at the trailing edge of the slider
Data Source
AI summary
A slider that minimizes lubricant accumulation includes bearing surfaces that provide above ambient fluid pressure, a cavity located between two bearing surfaces and at least one step feature that is spaced apart from the bearing surfaces and is located in and protrudes from a floor of the cavity at a height that is less than a height of the bearing surfaces. The at least one step feature includes surfaces configured to diverge and converge airflow in the cavity.