Enhanced-Surface Walls for Heat Transfer and Fluid Mixing
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Solution Overview
Problem
Existing enhanced-surface walls for heat transfer and fluid-mixing devices do not effectively maximize surface area and turbulence, leading to suboptimal heat transfer and fluid mixing performance.
Innovation Solution
The method involves impressing secondary and primary patterns onto a material to increase surface density and transverse dimension, with the secondary patterns potentially increasing the transverse dimension by up to 700% and maintaining minimum dimensions, followed by bending and welding to form an enhanced-surface tube for improved heat transfer and fluid handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If multiple pattern impressing steps are used to increase surface area, then heat transfer performance is improved, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is divided into sequential steps: first forming secondary patterns (ridges and valleys) on the material surface, then forming primary patterns (transverse circumferential patterns) on the already-formed secondary patterns. This segmentation allows each step to build upon the previous one, achieving high surface area multiplication through combined effects rather than requiring a single complex operation.
Solution Approach 2:
The secondary patterns are formed in advance before the primary patterns are applied. This preliminary action creates a pre-structured surface that enhances the subsequent primary pattern formation, allowing the material to be cold-worked into a highly complex three-dimensional geometry through sequential rather than simultaneous operations.
2Area of stationary object
If secondary patterns increase transverse dimension by up to 700%, then surface area is maximized, but maintaining minimum dimensions becomes difficult
Solution Approach 1:
The secondary patterns create localized ridges and valleys with specific geometric characteristics. The ridges maintain sufficient thickness and structural integrity while the valleys provide surface area multiplication. This local differentiation allows different regions of the material to serve different functions: ridges for structural strength and valleys for heat transfer surface area.
Solution Approach 2:
The patent specifies that secondary patterns should increase transverse dimension by 100-700% while maintaining minimum dimensions. This parameter control is achieved through controlled cold-working processes that transform the material into desired geometries without compromising structural integrity, balancing surface area expansion with dimensional constraints.
3Area of moving object
If enhanced surfaces are created through cold-working, then surface density increases, but material strength may be compromised
Solution Approach 1:
The cold-working process forms curved ridges and valleys rather than sharp angular features. These rounded geometries distribute stress more effectively through the material, reducing stress concentration points that would otherwise compromise structural integrity. The curvature inherent in the secondary and primary patterns contributes to maintaining material strength while achieving high surface density.
Solution Approach 2:
The enhanced surface geometry is formed by cold-working the material into a predetermined pattern rather than adding material or removing material through machining. This copying approach creates the enhanced surface by deforming the material itself into the desired three-dimensional pattern, preserving material properties while achieving surface area multiplication.
Data Source
AI summary
This invention relates generally to: (1) methods of forming enhanced-surface walls (20) for use in apparatae (e.g., heat transfer devices, fluid mixing devices, etc.) for performing a process, (2) to enhanced-surface walls per se, and (3) to various apparatae incorporating such enhanced-surface walls.The method improved method broadly comprises the steps of: providing a length of material (21) having opposite initial surfaces (22a, 22b), said material having a longitudinal centerline (x-x) positioned substantially midway between said initial surfaces, said material having an initial transverse dimension measured from said centerline to a point on either of said initial surfaces located farthest away from said centerline, each of said initial surfaces having a initial surface density, said surface density being defined as the number of characters on an surface per unit of projected surface area; impressing secondary patterns (23a, 23b) having secondary pattern surface densities onto each of said initial surfaces to distort said material and to increase the surface densities on each of said surfaces and to increase the trans-verse dimension of said material from said centerline to the farthest point of such distorted material; and impressing primary patterns (25a, 25b) having primary pattern surface densities onto each of such distorted surfaces to further distort said material and to further increase the surface densities on each of said surfaces; thereby to provide an enhanced-surface wall for use in an apparatus for performing a process.