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Transient Hot Strip On-a-Chip

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Abstract

For the first time, the thermal conductivity of a drop of water has been accurately measured within some tens of milliseconds. The instrument was a small MEMS sensor prototype that originally was designed to determine the flow velocity of fluids. Though the sensor has a strip-shaped heater of just 2 mm in length, its output was evaluated based on an adjusted transient hot wire (THW) model. The above extraordinary test was carried out in addition to a series of standard runs of the sensor on various gases and liquids. The objective was to work out an experimental proof-of-concept of a transient hot strip (sensor) on-a-chip and to demonstrate in an exemplary way its practical potential. The adjustments and extensions to the basic THW model were determined by means of reciprocal parametric mapping, a new mathematical tool. Bringing together MEMS technology and the hot-wire mathematical model has created a small size sensor that impresses by its increased reliability and robustness as well as its low power consumption. The sensor is particularly suitable for in situ and field measurements, long term monitoring and quality control of working fluids as well as a low cost katharometer in gas chromatography.

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Not applicable.

Notes

  1. MEMS: micro-electromechanical system.

  2. Not to be confused with composite functions.

  3. This statement will be justified below.

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Authors and Affiliations

  1. aiolosensors, In den Wiesen 4, 38112, Brunswick, Germany

    U. Hammerschmidt

  2. Diehl Metering GmbH, Donaustrasse 120, 90451, Nuremberg, Germany

    C. Sosna

  3. Diehl Metering GmbH, Industriestrasse 13, 91522, Ansbach, Germany

    A. Benkert

Authors
  1. U. Hammerschmidt
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  2. C. Sosna
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  3. A. Benkert
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All authors contributed equally in preparing and reviewing this manuscript.

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Hammerschmidt, U., Sosna, C. & Benkert, A. Transient Hot Strip On-a-Chip. Int J Thermophys 44, 81 (2023). https://doi.org/10.1007/s10765-023-03194-2

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