Advanced Liquid Cooling for Rheometers Laird Thermal Systems™ Application Note
●Introduction: Rheometers are scientific instruments used for studying the stress-strain relationship of polymers, fluids, and other soft materials to understand their flow/deformation properties. Rheometers are applied in a wide range of applications, such as in the development of new materials, quality control, and process optimization. Any rheometer that operates at elevated temperatures or measures temperature-dependent material properties requires a cooling system to maintain a precise temperature during testing. The specific type of cooling system used will depend on the requirements of the test and the properties of the sample.
●Conclusion: Rheometer temperature control requirements hinge on the material being tested and the specific rheological properties that need to be measured. Materials have different temperature- dependent properties, so the cooling requirements will vary depending on the material being tested. Thus, the choice of cooling system will depend on factors such as the required temperature range, the volume of the sample, and the specific rheological test being performed. Recirculating chillers that have environmental benefit are becoming the preferred method for cooling medium to large volume rheometers. Some rheometers may use a combination of cooling systems, such as a recirculating chiller and thermoelectric component, to provide greater flexibility and control over the temperature of the sample. The Nextreme Recirculating Chillers Platform provides more consistent and precise temperature control compared to other cooling solutions, making it an ideal choice for the large number of rheometer applications.
●Types of Rheometers:
■Rheometers work by applying controlled deformation or stress to a material and measuring the resulting response. The deformation can be applied in various ways, such as through rotational or oscillatory motion, shear flow, compression, or extension. The resulting response can be measured in terms of parameters such as viscosity, elasticity, shear modulus, yield stress, and other rheological properties.
■There are several types of rheometers available, each designed for specific applications and material properties. Some common types of rheometers include:
▲Rotational: measure the torque and angular velocity of a sample while it is rotated or sheared. Rotational rheometers are versatile and can be used to test a wide range of materials, including liquids, pastes, and gels.
▲Oscillatory: apply small, sinusoidal deformations to a sample and measure the resulting stress and strain. Oscillatory rheometers are particularly useful for studying the viscoelastic properties of materials, including their storage and loss moduli. 4
▲Capillary: measure the flow properties of materials as they pass through a narrow, cylindrical tube. Capillary rheometers are commonly used to study the flow behavior of polymers, particularly in extrusion and injection molding processes.
▲Extensional: measure the extensional properties of materials, including their elongational viscosity and extensional stress. Extensional rheometers are used in applications such as polymer processing, fiber spinning, and coating.
▲Cone-and-plate: consists of a rotating cone that is pressed against a stationary plate, creating a shear flow in the sample. Cone-and-plate rheometers are commonly used to study the rheological properties of liquids and semi-solid materials.
▲Micro: designed for measuring the rheological properties of small samples, such as biological tissues or microfluidic systems. Micro-rheometers can be based on any of the above principles but are adapted for smaller-scale samples.
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NRC Series 、 NRC 、 VRC Series 、 VRC 、 NRC 400 |
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Configurable Performance and Value Chiller 、 Thermoelectric-based Chiller 、 Nextreme Recirculating Chiller 、 Recirculating chillers 、 thermoelectric coolers |
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[ Rheometers ][ medical ][ industrial ][ transportation ][ telecommunications ] |
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2023/5/23 |
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