Double-Pipe Inner Tube Geometry for Lower Bend Pressure Loss
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heat-transferring double pipes face challenges in maintaining high heat-exchanging performance, especially in bent portions, due to reduced passageway area and increased pressure losses, which affects overall thermal efficiency.
Innovation Solution
The inner pipe of the heat-transferring double pipe is designed with distinct regions having different cross-sectional shapes and numbers of protruding parts, allowing for improved turbulent flow and reduced pressure losses in bent portions, while optimizing heat-exchanging performance in straight portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a straight-shaped pipe is used for the inner pipe, then manufacturing is simple, but heat-exchanging performance deteriorates in bent portions due to passageway narrowing and increased pressure losses
Solution Approach 1:
The inner pipe is segmented into multiple regions along its longitudinal direction, with each region having a different cross-sectional shape (circular, oval, rectangular, triangular). This segmentation allows the pipe to optimize heat exchange performance in different sections while maintaining manufacturing feasibility through standardized production methods for each shape type.
Solution Approach 2:
Different regions of the inner pipe are assigned different cross-sectional shapes tailored to their specific functional requirements. For example, regions requiring better heat exchange may have shapes with larger surface areas, while regions prone to bending may have shapes with better structural flexibility. This local optimization resolves the contradiction by addressing performance needs at specific locations rather than requiring a completely complex design throughout.
2Ease of manufacture
If the inner pipe has a uniform cross-sectional shape, then manufacturing is easy, but heat-exchanging performance is reduced in bent portions due to flow deterioration
Solution Approach 1:
The inner pipe is divided into multiple regions along its longitudinal direction, with each region having a different cross-sectional shape (circular, oval, rectangular, triangular). This segmentation allows the pipe to optimize heat exchange performance in different sections while maintaining manufacturing feasibility through standardized production methods for each shape type.
Solution Approach 2:
Different regions of the inner pipe are assigned different cross-sectional shapes tailored to their specific functional requirements. For example, regions requiring better heat exchange may have shapes with larger surface areas, while regions prone to bending may have shapes with better structural flexibility. This local optimization resolves the contradiction by addressing performance needs at specific locations rather than requiring a completely complex design throughout.
3Productivity
If a twisted pipe is used to improve heat-exchanging performance, then heat transfer efficiency increases, but the structure becomes more complex and difficult to manufacture
Solution Approach 1:
The inner pipe is divided into multiple regions along its longitudinal direction, with each region having a different cross-sectional shape (circular, oval, rectangular, triangular). This segmentation allows the pipe to optimize heat exchange performance in different sections while maintaining manufacturing feasibility through standardized production methods for each shape type.
Solution Approach 2:
Different regions of the inner pipe are assigned different cross-sectional shapes tailored to their specific functional requirements. For example, regions requiring better heat exchange may have shapes with larger surface areas, while regions prone to bending may have shapes with better structural flexibility. This local optimization resolves the contradiction by addressing performance needs at specific locations rather than requiring a completely complex design throughout.
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
This design enhances the overall heat-exchanging performance by minimizing passageway narrowing and pressure loss increases in bent portions, while maintaining high heat transfer efficiency in straight portions, thus improving the thermal efficiency of the heat-exchange cycle.
Implementation Method 1
The inner pipe has a first region and a second region, which have cross-sectional shapes that differ... locations of the first protruding parts are offset helically in a longitudinal direction... locations of the second protruding parts are offset helically in the longitudinal direction
Implementation Method 2
effecting the exchange of heat by causing a high-temperature coolant, which is discharged from the condenser, and a low-temperature coolant, which is discharged from the evaporator, to circulate, in opposition to each other, in two streams of space configured by the double pipe
Data Source
AI summary
An inner pipe (2) is designed for a heat-transferring double pipe that exchanges heat between a fluid that flows through the interior of the inner pipe and a fluid that flows between the inner pipe and an outer pipe (10) that surrounds the inner pipe. The inner pipe has a first region (21) and a second region (22), which have transverse cross-sectional shapes that differ. The first region has a plurality of first protruding parts (211) that protrude outward and form a first recess-protrusion shape in which locations of the first protruding parts are offset helically in a longitudinal direction. The second region has a plurality of second protruding parts (221) that protrude outward and form a second recess-protrusion shape, in which locations of the second protruding parts are offset helically in the longitudinal direction. The number of second protruding parts is greater than the number of first protruding parts.