Transient Hot-Wire Liquid Thermal Conductivity Analyzer
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The Transient Hot-Wire Liquid Thermal Conductivity Analyzer is widely used in research, development, and quality control environments where accurate thermal property data of fluids and semi-fluids is required. Typical application scenarios include:
Engine coolants, lubricants, and heat transfer fluids
Phase change materials (PCM) for thermal energy storage
Chemical liquids and pastes used in process engineering
High-viscosity fluids and suspensions
Research on thermal transport mechanisms
Typical tested products include engine coolants, PCM slurries, silicone oils, polymer solutions, and specialty chemical fluids.
Standards
The analyzer is designed and tested in accordance with internationally recognized standards:
(1) ASTM D7896-19 — Standard Test Method for Thermal Conductivity, Thermal Diffusivity, and Volumetric Heat Capacity of Liquids Using the Transient Hot-Wire Method
Parameters
| Parameter | Configuration 1 | Configuration 2 | Configuration 3 |
|---|---|---|---|
| Material | Liquids & phase change materials | Liquids & phase change materials | Liquids & phase change materials |
| Thermal Conductivity (W/m·K) | 0.01 – 2 | 0.01 – 2 | 0.01 – 2 |
| Additional Properties | Thermal diffusivity, specific heat | Thermal diffusivity, specific heat | Thermal diffusivity, specific heat |
| Viscosity Range (cP) | 0.001 – 10.000.000 | 0.001 – 10.000.000 | 0.001 – 10.000.000 |
| Sample Volume (mL) | 20 | 20 | 20 |
| Test Time (s) | 1 | 1 | 1 |
| Accuracy (Thermal Conductivity)* | ±2% | ±2% | ±2% |
| Repeatability (Thermal Conductivity)* | ±1% | ±1% | ±1% |
| Temperature Range (°C) | 10 to 200 | -40 to 200 | -160 / -40 / 0 to 300 |
| Pressure (bar) | Up to 20 | Up to 20 | Up to 35 |
| External Cooling Required | No | Yes | Yes |
| Standard | ASTM D7896-19 | ASTM D7896-19 | ASTM D7896-19 |
Features
Transient hot-wire method with ultra-fast 1-second measurement
High accuracy and excellent repeatability for liquid thermal properties
Non-steady-state measurement minimizes convection effects, even for high-viscosity samples
Small sample volume requirement (20 mL)
Wide viscosity, temperature, and pressure measurement capability
Fully compliant with ASTM D7896-19
Accessories
(1) Paste and PCM element — Designed for easy loading of phase change materials; spring-loaded structure accommodates thermal expansion and contraction while maintaining contact with the THW wire
(2) Observation element — Glass viewing port for monitoring sample conditions such as phase separation, boiling, or particle sedimentation
(3) Ambient density powder element — Suitable for basic powder testing at ambient pressure
(4) Variable density powder element — Spiral compression system allows density adjustment and stable wire contact
(5) Vertical element holder — Enables vertical loading for paste, PCM, and powder elements
(6) Cooling system options —
Economic circulator: down to 0 °C
Circulator: down to -15 / -35 / -50 °C
Advanced options: down to -100 / -150 °C
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