Thermal Conductivity of Liquid & Gases | ThermoFlux 7035

Key Features

Key Features

• Thermal conductivity investigation: Designed for direct experimental determination of thermal conductivity (k) of common fluids, water, oil, air, and carbon dioxide, using the Thermal Conductivity of Liquid & Gases ThermoFlux 7035
• 0.4 mm annular gap: Extremely narrow radial clearance between coaxial cylinders minimises natural convection, isolating conductive heat transfer
• Coaxial concentric cylinder design: Two copper cylindrical plugs, inner (Ø 33.3 mm, 120 mm length) and outer (Ø 34.1 mm, 100 mm length)
• Continuous electrical heating: Inner cylinder heated via 150 W cartridge heater with 150 °C temperature limit
• High-temperature safety cut-off: Automatic protection via integrated temperature controller
• Water-cooled outer cylinder: Stainless steel jacket with water inlet and drain connections
• Type K thermocouple instrumentation: Three thermocouples positioned across heating and cooling cylinders; calibrated range -100 ~ 400 °C
• Digital control panel: Displays temperature readings and heater power; includes potentiometer for variable power control, thermocouple selector switch, variable transformer, and power transducer
• Two fluid ports: Inner copper plug includes ports for introducing and venting the test fluid
• Optional DAQ software: ThermoFlux 7035, developed in National Instruments™ LabVIEW™ environment; compatible with all Windows™ versions

Experiments

• Calibration of the unit to establish the effect of incidental heat transfer
• Determining the thermal conductivity (k) of various liquids and gases
• Steady heat conduction in gases and liquids:
  • Determine the thermal resistance of fluids
  • Determination of thermal conductivity (k) for different fluids at different temperatures
• Transient heat conduction in fluids:
  • Interpret transient states during heating and cooling
  • Introduction to transient heat conduction with the block capacity model

Construction and Design

The Thermal Conductivity of Liquid & Gases ThermoFlux 7035 is constructed around two coaxial concentric copper cylindrical plugs separated by a precisely controlled 0.4 mm radial gap, the core functional element of this Thermal Conductivity of Liquid & Gases apparatus. The inner plug (Ø 33.3 mm, 120 mm long) is continuously electrically heated via a 150 W cartridge heater protected by a high-temperature cut-off controller. The outer plug (Ø 34.1 mm, 100 mm long) is enclosed within a stainless steel water-cooled cylindrical jacket equipped with inlet and drain connections. Both copper plugs carry two ports for fluid introduction and venting. Three Type K thermocouples, calibrated from -100 ~ 400 °C, are positioned across the heating and cooling cylinders to capture hot and cold face temperatures of the test fluid precisely. The test module connects to a control panel housing a variable transformer, power transducer, temperature controllers, digital indicators for temperature and heater power, and a thermocouple selector switch.

Software

ThermoFlux 7035 (Optional)

• DAQ software specially designed in the National Instruments™ LabVIEW™ environment
• Measures and calculates experimental results from the apparatus
• Includes a set of electronic sensors when the software option is selected
• Compatible with all Windows™ environments

Scope of Delivery

• 1 × Experiment unit
• 1 × Syringe
• 1 × Instruction manual

Standards & Compliance

• Manufactured under ISO 9001:2015 Quality Management System
• CE Marking - European Conformity where applicable
• Supplied with calibration certificate, operation manual, and experiment guide
• 12-month manufacturer's warranty (parts & labour from installation)

Ordering & Delivery

• Incoterms: CIF to destination seaport, FOB Mundra/Nhava Sheva, or Ex-Works Ambala
• Lead time: 3–5 weeks production + sea transit to destination
• Payment: LC (Letter of Credit) or T/T bank transfer against proforma invoice
• Documentation: commercial invoice, packing list, bill of lading, certificate of origin, insurance certificate

Frequently Asked Questions

Q1. What fluids can be tested with the Thermal Conductivity of Liquid & Gases ThermoFlux 7035?
The unit is designed to test common fluids including water, oil, air, and carbon dioxide.

Q2. Why is the annular gap set to 0.4 mm?
The 0.4 mm radial clearance between the two coaxial cylinders is intentionally made extremely small to reduce natural convection, ensuring that heat transfer through the test fluid occurs predominantly by conduction.

Q3. What type of temperature sensors are used in the ThermoFlux 7035?
The apparatus uses Type K thermocouples with a calibrated range of -100 ~ 400 °C. Three thermocouples are positioned across the heating and cooling cylindrical plugs.

Q4. What safety feature is built into the heater?
The 150 W cartridge heater is protected by a high-temperature cut-off mechanism via an integrated temperature controller, with a maximum operating limit of 150 °C.

Q5. Is DAQ software available for this unit?
Yes. Optional DAQ software (ThermoFlux 7035) is available, developed in the National Instruments™ LabVIEW™ environment and compatible with all Windows™ versions. A set of electronic sensors is included when the software option is selected.