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Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

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A High-Temperature Transient Hot-Wire Thermal Conductivity Apparatus for Fluids.

R A Perkins¹, H M Roder¹, C A Nieto de Castro²

¹National Institute of Standards and Technology, Boulder, CO 80303.

Journal of Research of the National Institute of Standards and Technology

|February 11, 2017

Summary

This summary is machine-generated.

A new apparatus accurately measures fluid thermal conductivity and diffusivity using a transient hot-wire technique. This instrument provides precise data for fluids like toluene, argon, and nitrogen.

Keywords:

argon heat capacity nitrogen radiation correction thermal conductivity thermal diffusivity toluene transient hot-wire

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Thermal Measurement Techniques in Analytical Microfluidic Devices

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Published on: June 3, 2015

Area of Science:

Thermodynamics
Fluid dynamics
Materials science

Background:

Accurate measurement of thermophysical properties is crucial for fluid characterization.
Existing methods may have limitations in temperature, pressure, or accuracy.
Transient hot-wire techniques offer potential for precise measurements.

Purpose of the Study:

To develop and describe a novel apparatus for measuring thermal conductivity and diffusivity of fluids.
To validate the instrument's performance using well-characterized fluids.
To present new thermal property data for liquid toluene, including radiation effects.

Main Methods:

Utilizes a step-power-forced transient hot-wire technique with two platinum wires.
Employs a Wheatstone bridge configuration for differential measurement.
Automated control and data acquisition using a microcomputer.

Main Results:

The apparatus measures thermal conductivity and diffusivity for fluids between 220-775 K and up to 70 MPa.
Verified performance with measurements on liquid toluene, argon, and nitrogen.
Reported new, radiation-corrected thermal conductivity data for liquid toluene (±0.3% precision, ±1% accuracy).
Achieved ±5% accuracy for thermal diffusivity measurements.

Conclusions:

The developed apparatus is effective for precise thermophysical property measurements of fluids.
New data for liquid toluene highlight the significance of radiative heat transfer.
The instrument enables calculation of specific heat when density is known.