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The role of capillary rheometer in flow testing
Date: 2025-09-14Read: 0
Capillary rheometer is an instrument used to measure the physical properties of liquids or viscous substances in a flowing state, mainly used to study the flow behavior of substances at different shear rates. It measures the pressure changes of substances flowing through capillaries and calculates their rheological properties, such as viscosity, flow curve, shear stress, etc. It is widely used in quality control and research and development processes in industries such as chemical, food, pharmaceutical, cosmetics, and polymers.
Capillary rheometerWorking principle:
1. Experimental setup:
Including a precision capillary tube and pressure sensor. During the experiment, the liquid sample flows through a capillary tube, and the instrument determines the flow characteristics of the liquid by measuring the relationship between the pressure and flow rate of the liquid flowing through the capillary tube.
2. Flow testing:
In flow testing, liquid flows in a capillary tube, and the instrument records pressure changes and calculates the flow characteristics of the liquid based on the known capillary diameter and geometric relationship of fluid flow.
3. Changes in shear rate:
It can be tested at different shear rates, and changes in shear rates can affect the flow behavior of liquids, such as shear thinning or shear thickening. By adjusting the relationship between pressure and flow rate, researchers can obtain rheological data at different shear rates.
4. Flow curve:
Through multiple tests, flow curves can be generated to display changes in viscosity or flowability at different shear rates. This is very important for analyzing the rheological properties of liquids, especially their changes under different temperature, concentration, or other environmental conditions.
Application fields:
1. Chemical industry:
In the field of chemical engineering, it is used to study the rheological properties of various chemicals, especially the flow characteristics of fluids such as polymers, inks, coatings, adhesives, etc. By testing the flow curve, researchers can optimize production processes and improve product performance.
2. Food industry:
In the food industry, it is used to measure the fluidity of various food liquids, concentrated juices, dairy products, sauces, etc. These measurement results are crucial for the processing, packaging, storage, and other aspects of food.
3. Pharmaceutical industry:
In the pharmaceutical industry, it is used to test the flow behavior of pharmaceutical formulations, lotion, gel and other preparations to ensure the quality, stability and operability of products.
4. Cosmetics industry:
In the cosmetics field, it is used to measure the rheological properties of skin care products, shampoo, lotion, cream and other cosmetics. These data help improve the user experience, stability, and market competitiveness of the product.
5. Polymer research:
The rheological properties of polymers directly affect their processing performance. Can be used to study the flowability of polymers in a molten state, helping to develop higher performance polymer materials.
Advantages of capillary rheometer:
1. High precision measurement:
It has high accuracy and can measure the flow characteristics of liquids under small pressure changes, ensuring the accuracy of experimental data.
2. Easy to operate:
The structure is simple and easy to operate, and users only need to follow the standard operating procedures for testing to obtain high-quality experimental data.
3. Wide applicability:
Suitable for various types of liquids or viscous substances, including high viscosity fluids, diluted liquids, suspensions, etc., with a wide range of applications.
4. Real time data analysis:
Through the accompanying software, experimental data can be analyzed in real-time and rheological curves can be generated, facilitating researchers to make scientific judgments and decisions.