Design and Validation of a High-Temperature Thermal Interface Resistance Measurement System

Hao, Menglong; Saviers, Kimberly R.; Fisher, Timothy S.

doi:10.1115/1.4033011

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…In contact resistance measurement with the 'steady state method,' uncertainty calculation must be taken into account due to the large number of measures that are made. The uncertainty calculation method used is the same as other authors in the literature [35][36][37][38] when applying the same method to measure thermal contact resistances. Table 3 shows the uncertainty values of the equipment.…”

Section: Methodsmentioning

confidence: 99%

The Importance of the Assembly in Thermoelectric Generators

Araiz¹,

Catalán²,

Herrero³

et al. 2018

Bringing Thermoelectricity Into Reality

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Generally, in the optimization of thermoelectric generators, only the heat exchangers or the thermoelectric modules themselves are taken into account. However, the assembly of the generator as a whole is of vital importance since a bad contact or a thermal bridge can waste the performance of an optimal generator. In this sense, the present chapter analyzes experimentally the use of different interface materials to reduce the thermal contact resistance between the modules and the heat exchangers, the influence of the pressure distribution in the assembly as well as the effect of different insulating materials in order to reduce the thermal bridge between the exchangers. Thus, it has been demonstrated that a good assembly requires the implementation of thermal interface materials to ensure the microscopic contact between the heat exchangers and the modules, besides a uniform clamping pressure. Nevertheless, since this is normally achieved with screws, they represent a source of thermal bridges in conjunction with the small distance between the exchangers. In order to reduce heat losses due to thermal bridges, which can represent up to one-third of the incoming heat, an increment of the distance between the exchangers and the use of an insulator is recommended.

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Section: Methodsmentioning

confidence: 99%

The Importance of the Assembly in Thermoelectric Generators

Araiz¹,

Catalán²,

Herrero³

et al. 2018

Bringing Thermoelectricity Into Reality

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show abstract

“…As described in more detail in Ref. [29], in order to make the 1D bar steady-state For the thermomechanically matched interface, a CNT array was synthesized on one side of an oxygen-free high thermal conductivity (OFHC) Cu substrate (10mm×10mm×2mm, polished with 1500 grit sanding sheet) as already mentioned. First, a five-layer catalyst (10nm Ti, 100nm Ni, 30nm Ti, 10nm Al, 5nm Fe, from bottom to top) was deposited via thermal evaporation.…”

Section: Methodsmentioning

confidence: 99%

“…Here, utilizing a newly developed test rig and its companion data evaluation designed for conducting high-temperature experiments, we measure and report the thermal properties of vertically oriented multi-walled CNT arrays as thermal interface materials at temperatures up to 700˚C [29]. Both thermomechanically matched and mismatched cases are tested and discussed.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of vertically oriented carbon nanotube arrays as high-temperature thermal interface materials

Hao

Huang

Saviers

et al. 2017

International Journal of Heat and Mass Transfer

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Carbon nanotube arrays hold much potential for high-temperature thermal interface applications that require thermal stability and mechanical compliance. A 1D reference bar test rig designed for measurements at and substantially above room temperature is used to perform thermal cycling tests on CNT arrays and to measure their thermal interface resistance at temperatures up to 700˚C. The CNT arrays are synthesized and tested with both thermomechanically matched (Cu-Cu) and mismatched (alumina-Cu) interfaces to examine their mechanical compliance. For both cases, a moderate decrease in thermal interface resistance (TIR) occurs from room temperature to 700˚C. The results reveal good cyclic stability of CNT arrays in both cases, confirming their ability to accommodate large thermomechanical mismatch. Postmortem analysis indicates that CNT free ends conform to the opposing Cu surface. In the Cu-Cu interface, only compressive deformation of the CNT arrays is observed. In the alumina-Cu interface, more complex thermomechanical deformation occurs that is hypothesized to be a combined effect of compressive loading and shear stress.

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“…To experimentally validate our thermal model we designed a test rig modified from the popular ASTM-5470 "reference bar" standard [35,36], as shown in Fig. 3(a,c).…”

Section: Proof-of-concept Test In Vacuummentioning

confidence: 99%

Efficient thermal management of Li-ion batteries with a passive interfacial thermal regulator based on a shape memory alloy

et al. 2018

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The poor performance of lithium ion batteries in extreme temperatures is hindering their wider adoption in the energy sector. A fundamental challenge in battery thermal management systems (BTMS) is that hot and cold environments pose opposite requirements: thermal transmission at high temperature for battery cooling, and thermal isolation at low temperature to retain the batteries' internally generated heat, leading to inevitable compromise of either hot or cold performances. Here, we demonstrate a thermal regulator that adjusts its thermal conductance as a function of the temperature, just as desired for the BTMS. Without any external logic control, this new thermal regulator increases battery capacity by a factor of three at T ambient of-20°C in comparison to a baseline BTMS that is always thermally conducting, while also limiting the battery temperature rise to 5°C in very hot environment (T ambient = 45°C) to ensure safety. The result expands the usability of lithium ion batteries in extreme environments and opens up new applications of thermally functional devices.

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Design and Validation of a High-Temperature Thermal Interface Resistance Measurement System

Cited by 10 publications

References 22 publications

The Importance of the Assembly in Thermoelectric Generators

The Importance of the Assembly in Thermoelectric Generators

Characterization of vertically oriented carbon nanotube arrays as high-temperature thermal interface materials

Efficient thermal management of Li-ion batteries with a passive interfacial thermal regulator based on a shape memory alloy

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