Evaporator Grooved Channels for Liquid Distribution
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Solution Overview
Problem
Evaporators face challenges in maintaining efficient operation in both terrestrial and microgravity environments due to uneven liquid distribution and movement, as the liquid phase of the working fluid tends to accumulate and move differently in these conditions, requiring effective replenishment of evaporating surfaces.
Innovation Solution
The design incorporates orifice inserts with a center plug and ring feature, and grooved channels with specific geometries that facilitate uniform fluid flow and distribution, ensuring liquid replenishment and vapor expulsion at similar rates, utilizing a plenum and grooves with tapered sidewalls and u-shaped channels to manage fluid phases in both environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional evaporator channels are used, then the structure is simple, but liquid distribution is uneven and liquid replenishment is insufficient in microgravity environments
Solution Approach 1:
The channel is segmented into multiple functional regions: an upper region with first sidewalls forming a first angle and a lower region with second sidewalls forming a second angle. This segmentation allows different portions of the channel to perform different functions - the upper region facilitates liquid distribution while the lower region enhances vapor expulsion, resolving the contradiction between structural simplicity and functional effectiveness.
Solution Approach 2:
Different portions of the channel are given different geometric properties - the upper region has sidewalls at a first angle optimized for liquid distribution, while the lower region has sidewalls at a second angle optimized for vapor expulsion. This local differentiation of geometric quality enables the single channel structure to simultaneously address both liquid replenishment and vapor removal requirements.
2Productivity
If the evaporating surface is fully covered by liquid, then evaporative efficiency is high, but liquid accumulation occurs in terrestrial environments
Solution Approach 1:
The channel geometry is designed to be dynamic in its fluid handling capability - the angled sidewalls naturally direct liquid flow during terrestrial operation while enabling vapor expulsion during microgravity operation. The channel adapts its function based on the operational environment, preventing liquid accumulation while maintaining full coverage of the evaporating surface.
Solution Approach 2:
The channel utilizes vertical dimensionality through its angled sidewalls to manage fluid phases - the upper region handles liquid distribution from above while the lower region manages vapor expulsion downward. This three-dimensional geometric arrangement allows the channel to simultaneously prevent liquid accumulation and maintain evaporative surface coverage.
3Reliability
If liquid flow is increased to replenish evaporating surface, then liquid distribution improves, but vapor expulsion is hindered
Solution Approach 1:
The channel is segmented into upper and lower regions with different angular configurations. The upper region with its specific sidewall angle optimizes liquid flow and distribution, while the lower region with its different sidewall angle optimizes vapor expulsion. This segmentation allows both liquid replenishment and vapor expulsion to occur simultaneously at optimal rates without interfering with each other.
Solution Approach 2:
Different portions of the channel are optimized for different functions - the upper region has geometric properties favoring liquid flow and distribution, while the lower region has geometric properties favoring vapor flow and expulsion. This local optimization of geometric quality allows the channel to simultaneously achieve high liquid replenishment and high vapor expulsion rates.
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 configuration ensures efficient evaporator operation by maintaining uniform liquid distribution and enhancing evaporative surface area, supporting effective operation in both terrestrial and microgravity environments through proper liquid replenishment and vapor expulsion.
Implementation Method 1
Each channel includes grooves respectively delimited by first and second interior facing sidewalls of the body which form a base and an apex... a portion of the fluid flow in a liquid phase within a groove of the channel will move in the groove from the base to the apex
Implementation Method 2
Evaporators utilize latent heat of a fluid to absorb waste heat from a heat source
Implementation Method 3
The exterior surface defines multiple inflow channels that extend from the first end toward the second end and terminate at termination points midway between the first and second ends. The ring feature is disposed about the center plug and the multiple inflow channels to define, with the center plug, a plenum with which the termination points of the multiple inflow channels are fluidly communicative.
Implementation Method 4
Evaporators utilize latent heat of a fluid to absorb waste heat from a heat source... a portion of the fluid flow in a vapor phase within a groove of the channel will move in the groove from the apex to the base
Data Source
AI summary
An orifice insert is provided and includes a center plug and a ring feature. The center plug has first and second ends and an exterior surface extending between the first and second ends. The exterior surface defines multiple inflow channels that extend from the first end toward the second end and terminate at termination points midway between the first and second ends. The ring feature is disposed about the center plug and the multiple inflow channels to define, with the center plug, a plenum with which the termination points of the multiple inflow channels are fluidly communicative.