scholarly journals Bestimmung der Wärmeleitfähigkeit ionischer Flüssigkeiten mit der Transient Hot-Bridge (THB) Methode

2010 ◽  
Vol 82 (9) ◽  
pp. 1377-1377
Author(s):  
B. Rathke ◽  
S. Will ◽  
U. Hammerschmidt
Keyword(s):  
Transient Hot Bridge

scholarly journals The Thermal Diffusivity of Glass Sieves: II. Gas-saturated Frits

2021 ◽  
Vol 42 (6) ◽  
Author(s):  
Ulf Hammerschmidt ◽  
Muhammad Abid
Keyword(s):  
Thermal Diffusivity ◽  
Borosilicate Glass ◽  
Room Temperature ◽  
Ambient Pressure ◽  
Expanded Uncertainty ◽  
The Matrix ◽  
Thermal Diffusivities ◽  
Transient Hot Bridge

AbstractThe thermal diffusivity of gas-saturated glass sieves (frits) of porosities between 20 % and 48 % is presented as measured at room temperature and ambient pressure. The saturants cover a range in thermal diffusivity from 20.63 × 10–6 m2⋅s−1 to 172 × 10–6 m2⋅s−1. The experiments were carried out using a transient hot-bridge instrument of an expanded uncertainty of 5 % to 10 %. It turned out that all measured thermal diffusivities of the gas-saturated frits (1) are smaller than that of the borosilicate glass the frits are made from and (2) are completely different from the thermal diffusivities of the liquid-saturated frits. Both these discrepancies can be attributed to characteristic properties of the matrix and not directly to the saturants. The first divergence results from thermal tortuosity that lengthens the pathway of heat through the matrix, whereas the second arises from dissolved He that enhances the transport of heat through the matrix.

Virtual Experiment Design for the Transient Hot-Bridge Sensor

2007 ◽  
Vol 28 (5) ◽  
pp. 1447-1460 ◽  
Author(s):  
R. Model ◽  
R. Stosch ◽  
U. Hammerschmidt
Keyword(s):  
Experiment Design ◽  
Virtual Experiment ◽  
Transient Hot Bridge

scholarly journals Thermal Conductivity Measurements of Liquids with Transient Hot-Bridge Method

2019 ◽  
Vol 18 (1) ◽  
pp. 25-30
Author(s):  
Fethi Albouchi ◽  
Foued Mzali ◽  
Salah Saadaoui ◽  
Abdelmajid Jemni
Keyword(s):  
Thermal Conductivity ◽  
Conductivity Measurements ◽  
Bridge Method ◽  
Transient Hot Bridge

scholarly journals The Thermal Diffusivity of Glass Sieves: I. Liquid Saturated Frits

2021 ◽  
Vol 42 (4) ◽  
Author(s):  
Ulf Hammerschmidt ◽  
Muhammad Abid
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Thermal Management ◽  
Electronic Devices ◽  
Lithium Ion ◽  
Expanded Uncertainty ◽  
Conduction Model ◽  
Experimental Findings ◽  
Composite Heat ◽  
Transient Hot Bridge

AbstractThe thermal diffusivity of evacuated and liquid-saturated borosilicate glass sieves (frits) of porosities between 20 % and 48 % is presented as measured at room temperature. The saturants cover a range in thermal diffusivity from 0.091 mm2·s−1 to 0.143 mm2·s−1. The runs were carried out using a transient hot bridge (THB) measuring instrument of an expanded uncertainty of 5 % to 10 %. The experimental results are successfully fitted to a novel transient parallel-serial (TPSC) conduction model for the time-dependent composite heat transfer in porous media. The TPSC-model is an extension of the steady-state parallel-serial conduction (PSC) model to predict the thermal conductivity. The TPSC model confirms the so-called thermal porosity of the frits under test, a term that has been introduced in a former report on the thermal conductivity of the matrices (Hammerschmidt and Abid, Int J Thermophys 42:40, 2021). The experimental findings on the conductive transport of heat by glass sieves and their accurate mathematical description in the framework of the PSC and TPSC models might effectively support improving the thermal management of electronic devices and lithium-ion batteries.

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