Condenser Outlet Inserts for Microgravity Flow Residence Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In microgravity environments, vapor or two-phase fluid in condensing heat exchangers tends to move in a straight direction, reducing contact with condenser walls and leading to low operating efficiency due to reduced residence time and contact area.
Innovation Solution
The use of porous, flow-restricting inserts with a specific geometry between condenser passages and an outlet header creates backpressure, increasing flow residence time and contact area within the condenser, enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flow passages are designed for parallel flow in microgravity, then the structure is simple and easy to manufacture, but the flow tends to move in a straight direction without contacting the condenser walls, reducing heat transfer efficiency
Solution Approach 1:
Flow restricting inserts are introduced as intermediary components between the flow passages and outlet header. These inserts act as mediators that disturb the straight flow path, forcing the vapor or two-phase fluid to contact the condenser walls while maintaining the overall simplicity of the parallel flow structure.
Solution Approach 2:
The flow restricting inserts are made from porous materials that allow fluid passage while creating turbulence and forcing contact with the condenser walls. The porous structure provides the necessary flow restriction without blocking the passage entirely, thereby improving heat transfer efficiency while maintaining structural simplicity.
2Productivity
If flow restricting inserts are added to increase residence time and contact area, then heat transfer efficiency improves, but device complexity increases
Solution Approach 1:
Porous material inserts provide flow restriction functionality through their inherent porous structure, eliminating the need for complex mechanical flow control mechanisms. The porous structure naturally creates turbulence and extends residence time without requiring additional moving parts or complex geometries.
Solution Approach 2:
The inserts change the flow parameters (velocity, pressure distribution, flow pattern) by introducing controlled resistance. This parameter change approach allows efficiency improvement through material selection and geometric optimization rather than through complex mechanical means.
3Productivity
If porous material with 30%-40% porosity is used for flow restricting inserts, then optimal balance between flow restriction and pressure drop is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies a porosity range of 30%-40% for the porous material inserts. This range represents an optimized balance between flow restriction capability and pressure drop characteristics. The specified range allows for manufacturing tolerances while achieving the desired flow control effect.
Solution Approach 2:
By specifying a porosity range rather than a single value, the patent accommodates manufacturing variations while maintaining effective flow restriction. This parameter specification approach balances performance requirements with manufacturing feasibility.
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 inserts enhance condenser efficiency by increasing vapor or two-phase flow residence time and contact area, resulting in improved heat transfer and uniform flow distribution, thereby improving condenser performance in both terrestrial and microgravity conditions.
Implementation Method 1
The use of porous, flow-restricting inserts with specific geometric shapes and materials between condenser passages and the outlet header creates backpressure, increasing the flow's residence time and contact area with the condenser surfaces
Implementation Method 2
Energy is transferred from the flow to the cold condenser walls. After heat is removed from the flow, it condenses to a liquid.
Implementation Method 3
After heat is removed from the flow, it condenses to a liquid.
Data Source
Figure 1~4
Figure 5~6
Figure 7A~7B
AI summary
An insert (230) for a condensing heat exchanger (110), having: a body (230C) extending aft from a forward end (230A) to an aft end (230B), and defining: a body exterior surface (230D); a forward segment (240) that extends aft from the forward end of the insert to a first axial location (240A) between the forward and aft ends of the insert, along the forward segment the body exterior surface is without openings; a middle segment (250) that extends aft from the first axial location to a second axial location (250A), along the middle segment the body exterior surface is cylindrical; and an aft segment (260) that extends aft from the second axial location to the aft end of the insert, along the aft segment the body exterior surface of the body is cylindrical and defines axially extending grooves (270), and the grooves are spaced apart from each other and extend forward from the aft end of the insert to the middle segment.