Grooved Space Radiator Channels With a Porous Insert for Vapor Flow
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Solution Overview
Problem
In space applications, the efficiency of space radiators is compromised in microgravity environments due to poor vapor or two-phase flow distribution, leading to reduced contact with condenser walls and lower condensing efficiency.
Innovation Solution
The implementation of grooved flow channels with porous inserts in the radiator design. The grooves increase contact area and improve condensing efficiency, while the porous inserts regulate fluid flow, preventing vapor from bypassing the condensation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional smooth flow channels are used in space radiators, then the structure is simple and easy to manufacture, but the vapor or two-phase flow has poor distribution and reduced contact with condenser walls resulting in low condensing efficiency
Solution Approach 1:
A porous insert is positioned between the flow channel and the outlet header to regulate fluid flow. The porous structure creates flow resistance that distributes two-phase flow more uniformly across the flow channel, preventing vapor bypassing and enhancing contact between the fluid and condenser walls, thereby improving condensing efficiency without requiring complex grooved channel structures.
Solution Approach 2:
The flow channel is divided into multiple parallel passages with distinct inlet and outlet regions. This segmentation allows independent flow control in each passage and facilitates uniform distribution of two-phase flow across all channels, improving overall condensing efficiency while maintaining manufacturing simplicity.
2Productivity
If grooved flow channels are implemented to increase contact area, then condensing efficiency improves, but manufacturing complexity increases
Solution Approach 1:
Instead of manufacturing complex grooved channels directly in the flow channel structure, a porous insert is used to achieve the same flow distribution and contact area enhancement effects. This approach maintains the simplicity of the base flow channel geometry while achieving improved condensing efficiency through the porous flow regulation mechanism.
Solution Approach 2:
The porous insert acts as an intermediary component between the simple flow channel structure and the desired complex flow distribution pattern. It mediates the flow to create uniform distribution and enhanced contact without requiring the flow channel itself to have complex grooved geometries, thus simplifying manufacturing.
3Stability of the object's composition
If orifices are used to create back pressure for uniform flow distribution, then flow uniformity improves, but pressure loss increases
Solution Approach 1:
The porous insert provides flow regulation through its porous structure rather than through discrete orifices. This distributed porous structure creates back pressure for uniform flow distribution across multiple passages while minimizing localized pressure losses that occur with sharp-edged orifices, as the flow passes through the gradual porous matrix.
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 the operating efficiency of space radiators in microgravity by improving fluid distribution and increasing contact area between the fluid and the condenser walls, thereby boosting condensing efficiency.
Implementation Method 1
a porous insert positioned between the flow channel and the header channel to regulate a flow of fluid into the outlet header from the flow channel
Implementation Method 2
the energy is transferred from the hot fluid to the cold flow channel walls
Implementation Method 3
After the heat is removed from the vapor or the two-phase flow, the hot fluid condenses back to liquid phase
Data Source
AI summary
A fluid flow pathway of a radiator includes a flow channel having an inlet end and an outlet end. The flow channel includes a plurality of grooves extending in a lengthwise direction along an interior of the flow channel. Each groove extends from a groove base to a groove apex radially outboard of the groove base. A main channel is defined radially between the groove bases of the plurality of grooves. The fluid flow pathway includes an outlet header to which flow channel is installed at a header channel, and a porous insert positioned between the flow channel and the header channel to regulate a flow of fluid into the outlet header from the flow channel.