Effect of interstitial compounds in controlling thermal contact conductance across pressed joints at cryogenic temperature and low contact pressure

Joseph, Robiya; Kumar, Narender; Kumar, Sandeep

doi:10.1016/j.applthermaleng.2021.117073

Cited by 8 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These adhesives have a wide range of applications in cryogenic environments, including supports, closure assembly, and structural joints for cryogenic vessels. 5,6 However, at low temperatures, due to the freezing of molecular chains and the reduction of lattice vibration caused by chains and groups, the thermal conductivity of epoxy resin exhibits an obvious decrease. 7 Furthermore, when excessive heat accumulates, the aging of epoxy resin is easily accelerated, which might deteriorate its performance, hugely affect its stability and reliability, and further shorten the service life.…”

Section: Introductionmentioning

confidence: 99%

Investigation of liquid crystal epoxy resin composites for application in cryogenic environments

Li,

Ma,

Liu

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

It is well accepted that the intrinsic thermal conductivity is extremely important in achieving excellent thermal conductivity composite and can be improved via incorporation of mesogens. In this work, an azomethine type liquid crystal epoxy (LCE) with aliphatic ether was designed and synthesized with expected structure, and the liquid crystal epoxy resin (LCER), together with KH‐550‐modified boron nitride (K‐BN)/LCER composites, has been obtained. Results show an increase of 31.6% in the thermal conductivity of the matrix, which could result in an enhancement of 57.7% for the composites when compared with E‐51. Additionally, the coefficient of thermal expansion (CTE), dielectric properties, and shear strength of LCER and K‐BN/LCER composites were assessed across a broad temperature range. Remarkably, the 30 wt% K‐BN/LCER composites showed a maximum decrease of 37.8% in CTE, while maintaining adequate shear strength to fulfill the bonding requirement and high thermal conductivity at both RT and −196°C.

show abstract

Section: Introductionmentioning

confidence: 99%

Investigation of liquid crystal epoxy resin composites for application in cryogenic environments

Li,

Ma,

Liu

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Furthermore, there is a great deal of research focused on simulation calculations Bolted flanges in aero-engine casings exhibit a nonlinear response when subjected to forced vibration [15]. Heat transfer across a pressed joint is significantly governed by contact thermal conductance, which in turn depends on the thermophysical properties of materials in contact, surface properties, contact pressure, working temperature, and interstitials present at the interface [16]. In a realistic structure, the actual contact area of a bolt joint surface only accounts for 0.01-0.1% of the nominal area.…”

Section: Introductionmentioning

confidence: 99%

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

Chen

Chu

2022

Aerospace

View full text Add to dashboard Cite

According to the discontinuous structural characteristics of a gas turbine, by considering the contact thermal resistance of the rough surface, a contact thermal resistance measurement experiment was conducted in this study. The main objectives of this work were to investigate the influence mechanism and change law of the contact thermal resistance characteristics on flange installation. Furthermore, this study conducted a theoretical analysis of contact thermal resistance and the calculation of a typical flange mounting edge based on actual operating conditions. The research results show that the contact thermal resistance of a typical flange mounting edge increases with an increase in flange clearance under different tightening torques, which is essentially proportional to the flange clearance. As the flange clearance increases, the unit contact thermal conductivity firstly decreases rapidly. Then, as the flange clearance reaches 0.4 mm, the decreasing rate of unit contact thermal conductivity tends to flatten. In addition, the contact thermal resistance of the typical flange mounting edge decreases with the increase in the tightening torque under different flange clearances. Furthermore, the contact area ratio is not related to the material, and the contact thermal resistance under actual working conditions can be calculated using the unit contact area.

show abstract

Experimental estimation of thermal contact conductance across pressed copper–copper contacts at cryogenic-temperatures

Siddappa

Tariq

2023

Applied Thermal Engineering

View full text Add to dashboard Cite

Effect of interstitial compounds in controlling thermal contact conductance across pressed joints at cryogenic temperature and low contact pressure

Cited by 8 publications

References 25 publications

Investigation of liquid crystal epoxy resin composites for application in cryogenic environments

Investigation of liquid crystal epoxy resin composites for application in cryogenic environments

Effect Mechanism and Performance Evaluation of Flange Contact Thermal Resistance in an Aero-Engine

Experimental estimation of thermal contact conductance across pressed copper–copper contacts at cryogenic-temperatures

Contact Info

Product

Resources

About