Determination of thermal contact conductance of flat and curvilinear contacts by transient approach

Kumar, Surya; Tariq, Andallib

doi:10.1016/j.expthermflusci.2017.06.004

Cited by 27 publications

(5 citation statements)

References 32 publications

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“…It is noticed that when using multiple transient temperature inputs, the cumulative error of the multiple measurement points and the error due to the temperature lag of the points taken further away from the contact surface influence on the computation of contact coefficients to some extent. Besides, using multiple sensors lessens the effectiveness in damping measurement errors as well as computation efficiency …”

Section: Methodsmentioning

confidence: 99%

Experimental investigation of contact heat transfer coefficients in nonisothermal glass molding by infrared thermography

Liu

Grunwald

et al. 2018

J Am Ceram Soc

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Nonisothermal glass molding has recently become a promising technology solution for the cost‐efficient production of complex precision glass optical components. During the molding process, the glass temperature and its temperature distribution have crucial effects on the accuracy of molded optics. In nonisothermal molding, the glass temperature is greatly influenced by thermal contact conductance because there is a large temperature difference between the glass and mold parts. Though widely agreed to be varied during the molding process, the contact conductance was usually assumed as constant coefficients in most early works without sufficient experimental justifications. This paper presents an experiment approach to determine the thermal contact coefficient derived from transient temperature measurements by using infrared thermographic camera. The transient method demonstrates a beneficially short processing time and the adequate measurement at desirable molding temperature without glass sticking. Particularly, this method promises the avoidance of the overestimated contact coefficients derived from steady‐state approach due to the viscoelastic deformation of glass during the inevitably long period of holding force. Based on this method, the dependency of thermal contact conductance on mold surface roughness, contact pressure, and interfacial temperature ranging from slightly below‐to‐above glass transition temperature was investigated. The results reveal the dominance of interfacial temperature on the contact conductance while the linear pressure‐dependent conductance with an identical slope observed for all roughness and mold temperatures. The accurate determination of the contact heat transfer coefficients will eventually improve the predictions of the form accuracy, the optical properties, and possible defects such as chill ripples or glass breakage of molded lenses by the nonisothermal glass molding process.

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Section: Methodsmentioning

confidence: 99%

Experimental investigation of contact heat transfer coefficients in nonisothermal glass molding by infrared thermography

Liu

Grunwald

et al. 2018

J Am Ceram Soc

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“…14b). Traditionally [35][36][37] a variation in the ℎ coefficient is attributed to a variation in contact pressure or surface topography of the contacting bodies, as these are the two most influential parameters. This will be further investigated in section 6.…”

Section: Results Of Stagementioning

confidence: 99%

Tool–chip thermal conductance coefficient and heat flux in machining: Theory, model and experiment

Kryzhanivskyy

Saoubi²,

Ståhl

et al. 2019

International Journal of Machine Tools and Manufacture

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“…Other studies relating to the TCC between flat surfaces could be found in References [19,20,[22][23][24][25][26][27]. Kumar and Tariq 11,28 investigated the timedependent interfacial heat transfer/TCC between steel-steel conforming (surface) as well as nonconforming (line) contacts under various loadings. They 11,28 understood that there was a distinct influence of conforming/nonconforming contacts on the transient TCC under identical thermophysical conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Kumar and Tariq 11,28 investigated the timedependent interfacial heat transfer/TCC between steel-steel conforming (surface) as well as nonconforming (line) contacts under various loadings. They 11,28 understood that there was a distinct influence of conforming/nonconforming contacts on the transient TCC under identical thermophysical conditions. On the basis of the quasistatic thermal equilibrium circumstance for the heat flow at the end of tests, the steady-state TCC was computed by the interfacial temperature drop.…”

Section: Introductionmentioning

confidence: 99%

Steady‐state estimation of thermal contact conductance between sliding disk and stationary cylinder with similar/dissimilar materials under the isothermally heated boundary condition

2021

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An accurate understanding of the thermal contact conductance (TCC) is imperative for the enhancement of the performance and service life of metallic cylindrical joints. However, the evaluation of the TCC between conforming cylindrical solids is quite intricate, as it depends on the temperature, pressure, roughness, relative sliding speed, and thermophysical properties of solids. Instead of generating contacting surfaces stochastically, in this communication, an experimental setup in the lab-scale consisting of a stationary cylinder and a sliding hot disk has been fabricated in which temporal evolutions of the temperature on both solids are recorded by thermocouples. Effects of the disk | 8013

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Determination of thermal contact conductance of flat and curvilinear contacts by transient approach

Cited by 27 publications

References 32 publications

Experimental investigation of contact heat transfer coefficients in nonisothermal glass molding by infrared thermography

Experimental investigation of contact heat transfer coefficients in nonisothermal glass molding by infrared thermography

Tool–chip thermal conductance coefficient and heat flux in machining: Theory, model and experiment

Steady‐state estimation of thermal contact conductance between sliding disk and stationary cylinder with similar/dissimilar materials under the isothermally heated boundary condition

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