Grooved Evaporator Channels for Liquid Replenishment in Microgravity
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Solution Overview
Problem
Evaporators face challenges in efficiently maintaining a liquid phase on the evaporating surface in both terrestrial and microgravity environments due to liquid accumulation and random distribution, respectively, necessitating effective liquid replenishment and vapor expulsion mechanisms.
Innovation Solution
The design incorporates grooved channels with specific apex angles and orifice inserts to manage liquid and vapor flow, ensuring consistent replenishment and expulsion in both environments, enhancing evaporative surface area and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channels are used in terrestrial environment, then liquid accumulates in low points due to gravity, but liquid distribution becomes uneven and replenishment is insufficient
Solution Approach 1:
The channel is divided into multiple sections with grooves at different locations (inlet, mid-section, outlet) to create multiple liquid collection and distribution points, ensuring uniform liquid distribution throughout the channel length and preventing accumulation in any single low point
Solution Approach 2:
The groove configuration is asymmetric with respect to gravity direction, positioning grooves at specific locations where liquid naturally accumulates in terrestrial environment, while the overall channel geometry maintains symmetry for microgravity operation, allowing the same structure to function effectively in both gravitational environments
2Reliability
If conventional channels are used in microgravity environment, then liquid distributes randomly, but liquid replenishment to evaporating surface becomes insufficient
Solution Approach 1:
Multiple grooves positioned at different locations along the channel create multiple controlled liquid release points, ensuring that liquid is distributed uniformly across the evaporating surface even when random distribution occurs in microgravity, thereby maintaining reliable liquid replenishment
Solution Approach 2:
The groove geometry is designed to utilize surface tension forces to automatically direct liquid flow from grooves to the evaporating surface without external pumping or control mechanisms, enabling self-regulating liquid distribution that works effectively in both terrestrial and microgravity environments
3Productivity
If groove apex angle is large, then liquid flow resistance decreases, but vapor expulsion efficiency is reduced
Solution Approach 1:
The groove apex angle is precisely optimized to a specific range (e.g., 30-60 degrees) that balances two competing requirements: a smaller angle provides better vapor expulsion efficiency while a larger angle reduces liquid flow resistance, the optimal value being determined by the specific operating conditions and working fluid properties
Solution Approach 2:
Different groove sections may have different apex angles tailored to local requirements, with steeper angles near the evaporating surface for efficient vapor expulsion and gentler angles in liquid supply regions to minimize flow resistance, creating a gradient that optimizes both functions simultaneously
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 grooved channels and orifice inserts facilitate efficient liquid replenishment and vapor expulsion, maintaining evaporator performance in both terrestrial and microgravity conditions, thereby optimizing evaporator operation.
Implementation Method 1
for a fluid flow moving through one of the channels in a microgravity environment 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
an evaporating surface of an evaporator should be covered by a layer of a liquid phase of a working fluid
Data Source
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AI summary
An evaporator element (101) is provided and includes a body (130) defining channels, each of which includes grooves (142) respectively delimited by first and second interior facing sidewalls of the body which form a base and an apex with an apex angle opposite the base and defined such that, for a fluid flow moving through one of the channels in a microgravity environment 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 and 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.