Vane Heat Exchanger Pins for Turbulence With Lower Pressure Drop
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Solution Overview
Problem
Conventional heat exchangers lack improved designs that enhance heat transfer efficiency while minimizing pressure drop and maintaining fluid turbulence.
Innovation Solution
The use of pins with teardrop or rounded triangle cross-sections and vanes in the fluid flowpath, manufactured via additive manufacturing, to increase turbulence and heat transfer area, combined with layers of varying pin patterns and heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional smooth pins are used in the flowpath, then the device complexity is low, but the heat transfer efficiency is insufficient and fluid turbulence is not enhanced
Solution Approach 1:
The pin is designed with a teardrop cross-section featuring a curved surface that transitions from a rounded leading edge to a tapered trailing edge. This curvature design enhances fluid turbulence and extends the boundary layer interaction, thereby improving heat transfer efficiency without significantly increasing device complexity
Solution Approach 2:
The pin structure is segmented into distinct functional zones: a leading edge for flow separation control, a curved intermediate section for turbulence generation, and a tapered trailing edge for flow reattachment. This segmentation allows each portion to perform its specific function optimally, enhancing overall heat transfer while maintaining manufacturing feasibility
2Temperature
If pins with increased surface area are used to enhance heat transfer, then the heat transfer area increases, but the pressure drop of the fluid increases
Solution Approach 1:
The curved teardrop surface promotes attached flow and reduces flow separation compared to sharp-edged geometries. This curvature minimizes wake formation and pressure losses while maintaining an extended surface area for heat transfer, effectively decoupling heat transfer area from pressure drop penalties
3Temperature
If additive manufacturing is used to create complex pin shapes, then the heat transfer efficiency improves, but the manufacturing complexity increases
Solution Approach 1:
The pin geometry is defined by continuous mathematical functions describing the teardrop cross-section, allowing precise control of curvature radii, length ratios, and surface profiles. This parametric definition enables optimization of heat transfer performance while maintaining compatibility with additive manufacturing processes through digital model adjustment
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
Enhances heat transfer efficiency and reduces pressure drop by creating fluid turbulence, allowing for a compact design with fewer layers and cost-effective production.
Implementation Method 1
Defining a fluid flowpath between upper and lower sheets where the fluid flows past pins formed with such a shape increases the turbulence of the fluid flow in the flowpath. By increasing the turbulence of the fluid flow, the heat transfer of the heat exchanger layer is increased.
Data Source
Figure 1
Figure 2~3
Figure 4A~4D
AI summary
A pin for a core layer of a heat exchanger past which fluid flowing through the layer passes, the pin (100) having a leading edge, a trailing edge, a first and a second end and, an outer surface between leading edge and trailing edge and the first and second ends, and wherein the pin (100) comprises a pin core (300) extending from the first end to the second end and defining the leading edge and the trailing edge, and a plurality of vanes (310) extending from the pin core each vane extending between the leading edge and the trailing edge, and the vanes arranged one above another in the direction from the first end to the second end.