Circular Water Tank Dissolution Tester Temperature Uniformity
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Solution Overview
Problem
Conventional dissolution testers face challenges in maintaining stable temperature uniformity across multiple vessels, leading to instability in dissolution tests due to temperature variations caused by non-uniform constant-temperature water distribution in rectangular tanks, which complicates the configuration and introduces additional instability.
Innovation Solution
A dissolution tester with a circular water tank and a concentric circular heater, along with a constant-temperature-water agitator, ensures uniform temperature distribution by using a circular water tank design that minimizes external temperature effects and provides axial symmetry in water convection, while a positioning mechanism and position sensor ensure proper alignment and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a rectangular constant-temperature-water tank is used, then the device configuration is simple, but the temperature uniformity across vessels deteriorates due to non-uniform water temperature distribution
Solution Approach 1:
The patent applies this principle by changing the water tank shape from rectangular to circular. The circular geometry eliminates the corner effects present in rectangular tanks, where temperature non-uniformity occurs due to uneven heat distribution and convection patterns. The circular shape provides radial symmetry that promotes uniform temperature distribution across all vessels regardless of their positions.
2Productivity
If multiple vessels are used simultaneously, then the productivity is improved, but the temperature uniformity across vessels deteriorates
Solution Approach 1:
The circular water tank geometry ensures that all vessels, regardless of their radial positions, experience similar temperature conditions. The radial symmetry of the circular shape creates uniform convection patterns that distribute heat evenly throughout the water, maintaining consistent temperatures across multiple vessels simultaneously.
Solution Approach 2:
The patent addresses local temperature variations by designing the water tank to provide uniform thermal conditions throughout. The circular shape with its radial symmetry ensures that every location within the tank, including corners and edges, experiences equivalent temperature distribution, eliminating local quality differences that would otherwise affect multiple vessels differently.
3Temperature
If a circular water tank is used, then the temperature uniformity is improved, but the device complexity increases
Solution Approach 1:
While the circular shape does represent a departure from conventional rectangular designs, the patent argues that the circular geometry actually simplifies the thermal management system by eliminating the need for complex heating and agitation mechanisms. The inherent radial symmetry of the circle naturally promotes uniform temperature distribution without requiring additional control systems.
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 solution allows for a more stable dissolution test by maintaining uniform temperatures across vessels, simplifying the configuration, and reducing light sensitivity effects through the use of light-shielding materials, thereby enhancing the reproducibility and reliability of the test results.
Implementation Method 1
a circular heater, which heats the constant-temperature water in the circular water tank
Implementation Method 2
the magnitude and direction of convection due to agitation of the constant-temperature water and heat also vary from place to place inside the tank
Implementation Method 3
because the magnitude and direction of convection due to agitation of the constant-temperature water and heat also vary from place to place inside the tank
Implementation Method 4
reducing light sensitivity effects through the use of light-shielding materials
Data Source
AI summary
A dissolution tester comprising: a circular water tank having a circular cross section the tank being disposed on a base and containing constant-temperature water; a head disposed above the circular water tank, which moves up and down relative to the base; a cantilever arm for supporting the head in a cantilevered fashion and for moving the head up and down relative to the base; a vessel in which a sample and a test liquid are placed, a desired portion of the vessel being immersed into the constant-temperature water in the circular water tank; and a test-liquid agitator suspended from the head, for agitating the sample and the test liquid inside the vessel.