Titanium Heat Exchanger Plate Surface Geometry for Formability
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Solution Overview
Problem
Existing heat-exchanging plates face challenges in achieving good heat conductivity and workability in press forming, particularly with materials like titanium, which has poor press formability and is prone to breakage due to anisotropy and lubricant film breakdown.
Innovation Solution
A heat-exchanging plate material is developed by forming fine recesses and projections on a metal flat plate, with specific dimensions and arrangements that define shape parameters G1 and G2, allowing for effective press working without breakage and enhancing heat conductivity through turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fine recesses and projections are formed on the surface of metal flat plate material to improve heat conductivity, then heat transfer efficiency is enhanced, but press formability deteriorates and breakage occurs during downstream press working
Solution Approach 1:
The invention changes the geometric parameters of surface recesses and projections by defining specific shape parameters (G1 ≤ 85 μm and G2 ≤ 0.94 μm/deg) that balance heat transfer enhancement with press formability. By controlling the height, width, pitch, and angle of surface features within specific ranges, the invention resolves the contradiction between improving heat conductivity and maintaining ease of manufacture during press working.
2Reliability
If titanium material is used for heat-exchanging plate to achieve good corrosion resistance and heat conductivity, then material performance is improved, but press formability deteriorates due to anisotropy and lubricant film breakdown
Solution Approach 1:
The invention addresses titanium's poor press formability by changing the geometric parameters of surface features to specific ranges (G1 ≤ 85 μm, G2 ≤ 0.94 μm/deg) that reduce stress concentration and prevent lubricant film breakdown during press working, while maintaining titanium's inherent corrosion resistance and heat conductivity properties.
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 solution enables the fabrication of heat-exchanging plates with significantly improved heat conductivity and press formability, preventing necking and breakage during press working, while ensuring high heat transfer efficiency and corrosion resistance.
Implementation Method 1
enhancing heat conductivity through turbulence
Data Source
Figure 1(a)~2(b)
Figure 3~4
Figure 5~6
AI summary
This original plate material for a heat exchanging plate (4) comprises a titanium flat plate material (1) having a minute recess and projections on the surface thereof, and the flat plate material (1) is press-worked to obtain the heat exchanging plate (4). The shape parameter (G1), defined as [height (µm) of the projections] x [width (µm) of the recess/pitch (µm) of adjacent projections], is 85 µm or less. Relating to this original plate material for a heat exchanging plate (4), the shape parameter (G2), defined as [height (µm) of the projections] x [width (µm) of the recess/pitch (µm) of adjacent projections/angle (deg) of the projections], is 0.94 µm/deg or less.