Experimental investigation of thermal contact conductance for nominally flat metallic contact

Tariq, Andallib; Asif, Mohammad

doi:10.1007/s00231-015-1551-1

Cited by 65 publications

(23 citation statements)

References 43 publications

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“…Due to the temperature of the contact surfaces between the copper bonds and the blade being less than 427 • C, the thermal radiation resistance can be neglected (Bahrami et al, 2004a). The thermal contact resistance model can be seen to in other works (Zheng et al, 2014;Shi et al, 2018;Tariq et al, 2016;Yovanovich et al, 2006;Grujicic et al, 2005;Bahrami et al, 2004b) and our previous research (Dai et al, 2020b).…”

Section: Model Equations and Boundary Conditionsmentioning

confidence: 65%

“…The temperature variation in and fluctuation of the molten pool can reflect the transient accumulation of heat, which affects the cooling rate and the quality of the surfacing zone (Näsström et al, 2019;Wahab et al, 1998). Based on the calculation results of the single and double ARM-repair height models, the double ARM-repair height is set as the z axis coordinate of the weld seam cross section.…”

Section: Comparison Of Temperature Distribution Of Weld Seammentioning

confidence: 99%

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Modeling of additive height and numerical analysis of cooling parameters for aero blade remanufacturing

et al. 2021

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Abstract. Additive remanufacturing height and matching cooling parameters are the key factors affecting blade repair quality. First, the mathematical model of the single additive remanufacturing repair height and wire-feeding speed was established, the solution method was proposed and the numerical solution was obtained, and the validity of the model was verified by experiments. Then, based on the calculation results of a single additive remanufacturing repair, the geometric morphology of the cross section under double additive remanufacturing repair was analyzed, and the mathematical model was established. Second, based on the optimal parameters obtained by numerical analysis and the mathematical model, the fluid structure coupling heat transfer model of “blade fixture” for base channel cooling was established. The cooling effect of the typical section under different initial temperatures and different flow rates was calculated, and the coupled heat transfer in the process of blade remanufacturing was explained by the mechanism. Third, through the comparative analysis of the cooling effect, optimal cooling parameters of double additive remanufacturing repair were obtained, and the model of coupled heat flow was verified by experiment. The results showed that the mathematical model of additive remanufacturing height is effective for studying the thermal cycle and cooling effect of welding, and the cooling parameters obtained by numerical analysis can effectively guarantee the quality of double additive remanufacturing of blade repair.

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Section: Model Equations and Boundary Conditionsmentioning

confidence: 65%

Section: Comparison Of Temperature Distribution Of Weld Seammentioning

confidence: 99%

Modeling of additive height and numerical analysis of cooling parameters for aero blade remanufacturing

et al. 2021

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“…Their findings revealed that rough surfaces exhibit higher TCR under the same conditions [20]. The changes in the hardness as well as the thermal conductivity of the contacting body affect the TCC, for example see [21][22][23]. Their research results indicated that the material with lower yield strength or hardness value and high thermal conductivity shows better improvement in TCC.…”

Section: --------------mentioning

confidence: 99%

Effects of contact pressure and interface temperature on thermal contact resistance between 2Cr12NiMoWV/BH137 and γ-TiAl/2Cr12NiMoWV interfaces

Liu

et al. 2020

THERM SCI

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Thermal contact resistance between interfaces is an important parameter in the analysis of temperature distribution for structural components. Thermal contact resistance between heat resistant steel 2Cr12NiMoWV/aluminum alloy BH137 interfaces and 2Cr12NiMoWV/titanium alloy γ-TiAl interfaces were experimentally investigated in the present paper. The effects of contact pressure and interface temperature were detailed. The temperature of contacting surfaces was from 80-250 ℃, and the contact pressure ranged from 2-17 MPa. All experiments were conducted in ambient atmosphere. Results showed that thermal contact resistance decreases with an increment of interface temperature or contact pressure. Under the same conditions of contact pressure and interface temperature, thermal contact resistance between 2Cr12NiMoWV and BH137 interfaces is lower than that between 2Cr12NiMoWV and γ-TiAl interfaces. The temperature dependence of thermal conductivity and mechanical properties was analyzed to explain the results. Furthermore, with the piston and piston pin as the research object, steady state temperature fields were simulated in cases of considering thermal contact resistance and without considering thermal contact resistance, respectively. The results showed that the maximum temperature of the piston pin will be lower when thermal contact resistance is considered.

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“…For the purpose of quantifying the thermal contact resistance values of various cases and evaluating the effect of physical parameter, many experimental apparatuses have been utilized for the measurements as shown in Fig. 3 [1][2][3][4][5][6]. Fig.…”

Section: Experimental Apparatusesmentioning

confidence: 99%

Review : Thermal contact problems at cryogenic temperature

Jeong¹,

Park²

2015

Progress in Superconductivity and Cryogenics

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This paper addresses technical problems of thermal contact conductance or resistance which inevitably occurs in most cryogenic engineering systems. The main focus of this paper is to examine what kind of physical factors primarily influences the thermal contact resistance and to suggest how it can be minimized. It is a good practical rule that the contact surface must have sub-micron roughness level with no oxide layer and be thinly covered by indium, gold, or Apiezon-N grease for securing sufficient direct contact area. The higher contact pressure, the lower the thermal contact resistance. The general description of this technique has been widely perceived and reasonable engineering results have been achieved in most applications. However, the detailed view of employing these techniques and their relative efficacies to reduce thermal contact resistances need to be thoroughly reviewed. We should consider specific thermal contact conditions, examine the engineering requirements, and execute each method with precautions to fulfil their maximum potentials.

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Experimental investigation of thermal contact conductance for nominally flat metallic contact

Cited by 65 publications

References 43 publications

Modeling of additive height and numerical analysis of cooling parameters for aero blade remanufacturing

Modeling of additive height and numerical analysis of cooling parameters for aero blade remanufacturing

Effects of contact pressure and interface temperature on thermal contact resistance between 2Cr12NiMoWV/BH137 and γ-TiAl/2Cr12NiMoWV interfaces

Review : Thermal contact problems at cryogenic temperature

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