Heat Transfer Enhancement in Heat Pipe Applications Using Surface Coating

Buffone, Cosimo; Sefiane, Khellil; Buffone, Luigi; Lin, Song

doi:10.1615/jenhheattransf.v12.i1.20

Cited by 14 publications

(9 citation statements)

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“…In the ground state of carbon, the electrons exist as 2s 2 , 2px 1 , 2py 1 which means that stable bonds can form with two other atoms. It is also possible to promote one the of the s electrons into the 2pz orbital to obtain a structure of 2s 1 , 2px 1 , 2py 1 , 2pz 1 .…”

Section: Bonding Of Carbonmentioning

confidence: 99%

Diamond like carbon coatings for tribology: production techniques, characterisation methods and applications

Hainsworth¹,

Uhure²

2007

International Materials Reviews

184

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There are numerous types of surface coatings available to engineers in order to improve the friction and wear resistance of components. In order to successfully use these coatings in practice, it is important to understand the different types of coatings available, and the factors that control their mechanical and tribological properties. This paper will focus on the application of diamond-like carbon (DLC) coatings in tribological applications. Thus far, DLC coatings have found broad industrial application, particularly in optical and electronic areas. In tribological applications, DLC coatings are now being used successfully as coatings for ball bearings where they decrease the friction coefficient between the ball and race, in shaving applications where they increase the life of razor blades in wet shaving applications, and increasingly in automotive applications such as racing engines and standard production vehicles.The structure and mechanical properties of DLC coatings are dependent on the deposition method and the incorporation of additional elements such as nitrogen, hydrogen, silicon and metal dopants. These additional elements control the hardness of the resultant film, the level of residual stress and the tribological properties. As diamond-like carbon films increasingly become adopted for use in industry, it is important to review the factors that control their 2 of 42 DLC Reviewproperties, and thus, the ultimate performance of these coated components in practical tribological applications.

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Section: Bonding Of Carbonmentioning

confidence: 99%

Diamond like carbon coatings for tribology: production techniques, characterisation methods and applications

Hainsworth¹,

Uhure²

2007

International Materials Reviews

184

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“…Heat pipes are passive cooling devices consisting of a tube and partially filled with working fluid (Faghri, 1995). Two-phase heat transfer is the main reason for higher heat transfer effectiveness in pulsating heat pipes (PHPs) (Buffone, Sefiane, Buffone, & Lin, 2005). The working fluid in heat pipes receives heat in the evaporator section and evaporates, and returns to its liquid condition by heat dissipation in the condenser section.…”

Section: Introductionmentioning

confidence: 99%

Applying GMDH neural network to estimate the thermal resistance and thermal conductivity of pulsating heat pipes

Ahmadi

Sadeghzadeh

Raffiee

et al. 2019

Engineering Applications of Computational Fluid Mechanics

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Thermal performance of pulsating heat pipes (PHPs) is dependent to several factors. Inner and outer diameter of tube, filling ratio, thermal conductivity, heat input, inclination angle, and length of each section are the most influential factors in the design process of PHPs. Since water is a conventional working fluid for PHPs, thermal resistance and effective thermal conductivity of PHPs filled with water are modeled by applying a GMDH (group method of data handling) neural network. The input data of the GMDH model are collected from other experimental investigations to predict the physical properties including thermal resistance and effective thermal conductivity of PHPs filled with water as working fluid. The accuracy of the introduced models are examined through the R 2 tests and resulted in 0.9779 and 0.9906 for thermal resistance and effective thermal conductivity, respectively.

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“…Of special interest to this work is the passive enhancement method. These methods are primarily comprised of at least one of the following mechanisms: (a) increasing the surface area [5]; (b) interrupting the boundary layer to promote the convective heat transfer coefficient [6]; (c) using of liquid-vapor phase change [7]; (d) using the surface coatings to increase velocity near boundaries [8] [9]; (e) using the liquid and gas additives to enhance thermophysical properties [6] [10]; (f) using the flow rate and velocity amplification devices [11] [12]; and (g) layering the immiscible flows [13]- [15]. In the present work, it is interested to investigate heat transfer enhancement due to properly distributing a given flow rate before striking a plate having a protruding edge.…”

Section: Introductionmentioning

confidence: 99%

Modelling and Theoretical Analysis of Laminar Flow and Heat Transfer in Various Protruding-Edged Plate Systems

Khaled

2015

JECTC

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Laminar flow and heat transfer in different protruding-edged plate systems are modelled and analyzed in the present work. These include the Parallel Flow (PF) and the Counter Flow (CF) protruding-edgedplate exchangers as well as those systems being subjected to Constant Wall Temperature (CWT) and Uniform Heat Flux (UHF) conditions. These systems are subjected to normal free stream having both power-law velocity profile and same average velocity. The continuity, momentum and energy equations are transformed to either similarity or nonsimilar equations and then solved by using well validated finite difference methods. Accurate correlations for various flow and heat transfer parameters are obtained. It is found that there are specific power-law indices that maximize the heat transfer in both PF and CF systems. The maximum reported enhancement ratios are 1.075 and 1.109 for the PF and CF systems, respectively, at Pr = 100. These ratios are 1.076 and 1.023 for CWT and UHF conditions, respectively, at Pr = 128. Per same friction force, the CF system is preferable over the PF system only when the power-law indices are smaller than zero. Finally, this work demonstrates that by appropriately distributing the free stream velocity, the heat transfer from a plate can be increased up to 10% fold.

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Heat Transfer Enhancement in Heat Pipe Applications Using Surface Coating

Cited by 14 publications

References 0 publications

Diamond like carbon coatings for tribology: production techniques, characterisation methods and applications

Diamond like carbon coatings for tribology: production techniques, characterisation methods and applications

Applying GMDH neural network to estimate the thermal resistance and thermal conductivity of pulsating heat pipes

Modelling and Theoretical Analysis of Laminar Flow and Heat Transfer in Various Protruding-Edged Plate Systems

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