Snow Accretion Test Device Alternating Temperature Cycles
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Solution Overview
Problem
Conventional snow accretion tests fail to reproduce natural snow accumulation scenarios, as artificially created snow is easily removable and does not adhere firmly to specimens like it does in natural environments.
Innovation Solution
A snow accretion test method and device that alternates between a snow accumulation step, where snow is sprayed onto a specimen at a low temperature, and a snow accretion step, where the temperature is lowered to freeze the accumulated snow without further snow supply, promoting bonding and firm adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If snow is simply caused to fall in the test chamber, then snow accumulation can be achieved, but the snow can be easily scraped off and does not firmly adhere to the specimen
Solution Approach 1:
The patent divides the snow accretion test into two distinct phases: a snow accumulation phase where snow is supplied to the specimen, and a snow accretion phase where snow supply is stopped and the ambient temperature is lowered to freeze the accumulated snow. This segmentation allows each phase to optimize for its specific function, resulting in firm snow adhesion without excessive complexity
Solution Approach 2:
The patent employs periodic alternation between snow supply periods and no-snow supply periods. During the snow supply period, snow is accumulated on the specimen; during the no-snow supply period, the temperature is lowered to freeze the snow and promote bonding. This periodic action transforms the simple snow falling process into a controlled cycle that achieves firm adhesion
2Reliability
If the ambient temperature is lowered to freeze snow, then snow bonding is promoted and firm adhesion is achieved, but the test time is extended due to alternating phases
Solution Approach 1:
The patent performs preliminary snow accumulation before initiating the freezing process. Snow is first supplied and accumulated on the specimen during the snow accumulation phase, and then the snow supply is stopped before the temperature is lowered. This preliminary action ensures that snow is already in place and ready to bond, reducing the overall test time compared to simultaneous freezing and accumulation
3Ease of manufacture
If snow is accumulated without freezing, then the test process is simple, but the snow layer is unstable and does not reproduce natural conditions
Solution Approach 1:
The patent utilizes the phase transition of water from liquid to solid by lowering the ambient temperature to below freezing point during the snow accretion phase. This phase transition freezes the accumulated snow, transforms it into a stable solid structure, and promotes bonding between snow particles, thereby achieving snow layer stability that reproduces natural freezing conditions
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 method effectively reproduces the natural process of snow hardening and firm adhesion, allowing for the formation of a thick, stable snow layer on specimens, mimicking natural snow accumulation and freezing conditions.
Implementation Method 1
an air conditioner (14) for air-conditioning an inside of the test chamber (12)
Implementation Method 2
a nozzle (18) for spraying water particles for obtaining the snowfall environment in the test chamber (12)
Data Source
AI summary
In a snow accretion test method, a snow accumulation step of accumulating snow on a specimen, and a snow accretion step of freezing snow accumulated on the specimen in a state where snow is not supplied to the specimen are performed. The snow accumulation step and the snow accretion step are repeatedly performed. In the snow accretion step, the ambient temperature of the specimen is adjusted to a temperature lower than the ambient temperature in the snow accumulation step.