Microfluidic Homogeneous Catalysis for Low-Pressure Drop Propulsion
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Solution Overview
Problem
Heterogeneous catalysis-based monopropellant propulsion systems face limitations due to high flow resistance and power requirements for preheating catalyst beds, which are costly and challenging to manufacture, especially in small spacecraft applications.
Innovation Solution
A microfluidic homogeneous catalysis system using a liquid monopropellant and a liquid catalyst solution in an elongated mixing channel with a hydraulic diameter less than 5 mm, creating striated laminar or slug flow to generate hot gases with low input power and reduced pressure drop, eliminating the need for a catalyst bed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heterogeneous catalysis-based systems using solid catalyst beds are used, then catalytic decomposition of monopropellant can be achieved, but flow resistance becomes significant and power requirements for preheating increase
Solution Approach 1:
The invention changes the physical state of the catalyst from solid to liquid, and changes the flow regime parameters (Reynolds number, flow velocity) to achieve efficient mixing and catalytic decomposition without requiring high preheating power. The liquid catalyst solution operates effectively at lower temperatures compared to solid catalyst beds
Solution Approach 2:
The invention uses hydraulic flow control to manage the liquid monopropellant and liquid catalyst solution through microfluidic channels, utilizing flow dynamics and pressure control to achieve efficient catalytic decomposition without the need for high-power preheating systems required by solid catalyst beds
2Reliability
If heterogeneous catalysis-based systems using solid catalyst beds are used, then catalytic decomposition can be achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts the solid catalyst bed structure and replaces it with a liquid catalyst solution delivered through microfluidic channels. This eliminates the complex manufacturing requirements of solid catalyst beds while maintaining catalytic decomposition efficiency
Solution Approach 2:
By changing the catalyst phase from solid to liquid and operating in a microfluidic regime, the invention simplifies manufacturing processes. The liquid catalyst solution can be delivered through standard microfluidic channels without requiring complex solid catalyst bed fabrication
3Use of energy by moving object
If liquid monopropellant and liquid catalyst are mixed in homogeneous catalysis, then flow resistance and power requirements are reduced, but mixing efficiency becomes critical
Solution Approach 1:
The invention uses dynamic flow control to optimize mixing efficiency. By controlling the flow rates, velocities, and Reynolds numbers of the liquid monopropellant and liquid catalyst solution, the system achieves efficient mixing and catalytic decomposition with low power consumption
Solution Approach 2:
The microfluidic channel structure acts as an intermediary that enhances mixing between the liquid monopropellant and liquid catalyst solution. The channel geometry and flow dynamics facilitate efficient contact between the two liquids, ensuring high mixing efficiency without requiring additional power input
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 approach reduces pressure drop, manufacturing costs, and power consumption, enabling compact, efficient thruster designs suitable for small spacecraft with flexible operation modes between monopropellant and bipropellant performance.
Implementation Method 1
create one or the other of 1) striated laminar flow
Implementation Method 2
elongated mixing catalyzation channel
Implementation Method 3
liquid catalyst solution source containing a liquid catalyst solution
Implementation Method 4
catalytic process that decomposes the monopropellant to generate expanding gas
Implementation Method 5
create one or the other of 1) striated laminar flow and 2) slug flow in the elongated mixing catalyzation channel
Data Source
AI summary
Systems, apparatuses, and methods for generating hot gases based on catalyzation involving flowing catalyst. Catalysis occurs in a flow-type mixing catalyzation channel in which a liquid catalyst mixes with a liquid reactant flowing in a desired flow regime, such as a striated (laminar) flow regime or a slug flow regime. Devices such as micro-thrusters for satellite and other applications and hot gas generators for powering another device, such as an electrical generator, can be made using one or more flow-type mixing catalyzation channels.