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Transient Hot-Wire Liquid Thermal Conductivity Analyzer

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Web: qinsun-lab.com

Email:serving@qinsun-lab。com

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

ParameterConfiguration 1Configuration 2Configuration 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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